* [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport.
@ 2022-05-30 15:07 Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 01/10] qmp: Support for querying stats Paolo Bonzini
` (9 more replies)
0 siblings, 10 replies; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
This patchset adds QEMU support for querying fd-based KVM statistics.
This allows the user to analyze the behavior of the VM without access
to debugfs.
However, instead of adding an ad hoc command, the new QMP entry point
can be extended in the future to more statistics provider than KVM
(for example TCG, tap, or the block layer) and to more objects than
the VM and vCPUS (for example network interfaces or block devices).
Because the statistics exposed by KVM are not known at compile time,
the kernel interface also comes with an introspectable schema. This
schema is exposed by the query-stats-schemas QMP command.
Patches 1 and 2 add the basic support, respectively the QMP command
and the KVM producer.
Patches 3 to 6 add a basic HMP implementation. The first of the two
adds a basic filtering mechanism to the QMP command, which is then used
by HMP (which only shows vCPU statistics for the currently selected
guest CPU; this is consistent with other HMP commands and does not
flood the user with an overwhelming amount of output).
The remaining patches add more filtering, respectively by provider
and by the name of a statistic.
The v4->v5 delta mostly restructures the implementation to hve
sensible results if the same providers is specified many times in
the same query-stats invocation.
v4->v5:
- all: wrap long lines
- patch 1: fix indentation of "Note"
- patch 2: use QAPI_LIST_PREPEND and error_setg_errno
- patches 4/5: new
- patch 6: reorganize printing of units to use prefixes instead
of long names ("ns", not "nanoseconds")
- patches 1/3/7/9: filtering reimplemented to improve behavior if the
same provider occurs many times in the same query-stats invocation.
Before, all filters were evaluated first, and the callback was then
run if there was a match. Now, each filter is evaluated separately.
- patch 9: do not drop names from prototypes
Mark Kanda (3):
qmp: Support for querying stats
kvm: Support for querying fd-based stats
hmp: add basic "info stats" implementation
Paolo Bonzini (7):
qmp: add filtering of statistics by target vCPU
cutils: fix case for "kilo" and "kibi"
cutils: add functions for IEC and SI prefixes
qmp: add filtering of statistics by provider
hmp: add filtering of statistics by provider
qmp: add filtering of statistics by name
hmp: add filtering of statistics by name
accel/kvm/kvm-all.c | 408 +++++++++++++++++++++++++++++++++++++++
hmp-commands-info.hx | 14 ++
include/monitor/hmp.h | 1 +
include/monitor/stats.h | 45 +++++
include/qemu/cutils.h | 18 ++
monitor/hmp-cmds.c | 232 ++++++++++++++++++++++
monitor/qmp-cmds.c | 155 +++++++++++++++
qapi/meson.build | 1 +
qapi/qapi-schema.json | 1 +
qapi/stats.json | 249 ++++++++++++++++++++++++
tests/unit/test-cutils.c | 52 +++++
util/cutils.c | 36 +++-
12 files changed, 1202 insertions(+), 10 deletions(-)
create mode 100644 include/monitor/stats.h
create mode 100644 qapi/stats.json
--
2.36.1
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v5 01/10] qmp: Support for querying stats
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 02/10] kvm: Support for querying fd-based stats Paolo Bonzini
` (8 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert, Mark Kanda
From: Mark Kanda <mark.kanda@oracle.com>
Gathering statistics is important for development, for monitoring and
for performance measurement. There are tools such as kvm_stat that do
this and they rely on the _user_ knowing the interesting data points
rather than the tool (which can treat them as opaque).
The commands introduced in this commit introduce QMP support for
querying stats; the goal is to take the capabilities of these tools
and making them available throughout the whole virtualization stack,
so that one can observe, monitor and measure virtual machines without
having shell access + root on the host that runs them.
query-stats returns a list of all stats per target type (only VM
and vCPU to start); future commits add extra options for specifying
stat names, vCPU qom paths, and providers. All these are used by the
HMP command "info stats". Because of the development usecases around
statistics, a good HMP interface is important.
query-stats-schemas returns a list of stats included in each target
type, with an option for specifying the provider. The concepts in the
schema are based on the KVM binary stats' own introspection data, just
translated to QAPI.
There are two reasons to have a separate schema that is not tied to
the QAPI schema. The first is the contents of the schemas: the new
introspection data provides different information than the QAPI data,
namely unit of measurement, how the numbers are gathered and change
(peak/instant/cumulative/histogram), and histogram bucket sizes.
There's really no reason to have this kind of metadata in the QAPI
introspection schema (except possibly for the unit of measure, but
there's a very weak justification).
Another reason is the dynamicity of the schema. The QAPI introspection
data is very much static; and while QOM is somewhat more dynamic,
generally we consider that to be a bug rather than a feature these days.
On the other hand, the statistics that are exposed by QEMU might be
passed through from another source, such as KVM, and the disadvantages of
manually updating the QAPI schema for outweight the benefits from vetting
the statistics and filtering out anything that seems "too unstable".
Running old QEMU with new kernel is a supported usecase; if old QEMU
cannot expose statistics from a new kernel, or if a kernel developer
needs to change QEMU before gathering new info from the new kernel,
then that is a poor user interface.
The framework provides a method to register callbacks for these QMP
commands. Most of the work in fact is done by the callbacks, and a
large majority of this patch is new QAPI structs and commands.
Examples (with KVM stats):
- Query all VM stats:
{ "execute": "query-stats", "arguments" : { "target": "vm" } }
{ "return": [
{ "provider": "kvm",
"stats": [
{ "name": "max_mmu_page_hash_collisions", "value": 0 },
{ "name": "max_mmu_rmap_size", "value": 0 },
{ "name": "nx_lpage_splits", "value": 148 },
... ] },
{ "provider": "xyz",
"stats": [ ... ] }
] }
- Query all vCPU stats:
{ "execute": "query-stats", "arguments" : { "target": "vcpu" } }
{ "return": [
{ "provider": "kvm",
"qom_path": "/machine/unattached/device[0]"
"stats": [
{ "name": "guest_mode", "value": 0 },
{ "name": "directed_yield_successful", "value": 0 },
{ "name": "directed_yield_attempted", "value": 106 },
... ] },
{ "provider": "kvm",
"qom_path": "/machine/unattached/device[1]"
"stats": [
{ "name": "guest_mode", "value": 0 },
{ "name": "directed_yield_successful", "value": 0 },
{ "name": "directed_yield_attempted", "value": 106 },
... ] },
] }
- Retrieve the schemas:
{ "execute": "query-stats-schemas" }
{ "return": [
{ "provider": "kvm",
"target": "vcpu",
"stats": [
{ "name": "guest_mode",
"unit": "none",
"base": 10,
"exponent": 0,
"type": "instant" },
{ "name": "directed_yield_successful",
"unit": "none",
"base": 10,
"exponent": 0,
"type": "cumulative" },
... ]
},
{ "provider": "kvm",
"target": "vm",
"stats": [
{ "name": "max_mmu_page_hash_collisions",
"unit": "none",
"base": 10,
"exponent": 0,
"type": "peak" },
... ]
},
{ "provider": "xyz",
"target": "vm",
"stats": [ ... ]
}
] }
Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
I left the Reviewed-by even though the implementation
changed a bit; mostly because the schema and the concepts
are the same and this patch is relatively simple.
include/monitor/stats.h | 34 +++++++
monitor/qmp-cmds.c | 95 ++++++++++++++++++
qapi/meson.build | 1 +
qapi/qapi-schema.json | 1 +
qapi/stats.json | 216 ++++++++++++++++++++++++++++++++++++++++
5 files changed, 347 insertions(+)
create mode 100644 include/monitor/stats.h
create mode 100644 qapi/stats.json
diff --git a/include/monitor/stats.h b/include/monitor/stats.h
new file mode 100644
index 0000000000..912eeadb2f
--- /dev/null
+++ b/include/monitor/stats.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022 Oracle and/or its affiliates.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef STATS_H
+#define STATS_H
+
+#include "qapi/qapi-types-stats.h"
+
+typedef void StatRetrieveFunc(StatsResultList **result, StatsTarget target,
+ Error **errp);
+typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
+
+/*
+ * Register callbacks for the QMP query-stats command.
+ *
+ * @stats_fn: routine to query stats:
+ * @schema_fn: routine to query stat schemas:
+ */
+void add_stats_callbacks(StatRetrieveFunc *stats_fn,
+ SchemaRetrieveFunc *schemas_fn);
+
+/*
+ * Helper routines for adding stats entries to the results lists.
+ */
+void add_stats_entry(StatsResultList **, StatsProvider, const char *id,
+ StatsList *stats_list);
+void add_stats_schema(StatsSchemaList **, StatsProvider, StatsTarget,
+ StatsSchemaValueList *);
+
+#endif /* STATS_H */
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index 1ebb89f46c..a6ac8d7473 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -35,6 +35,7 @@
#include "qapi/qapi-commands-control.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qapi-commands-misc.h"
+#include "qapi/qapi-commands-stats.h"
#include "qapi/qapi-commands-ui.h"
#include "qapi/type-helpers.h"
#include "qapi/qmp/qerror.h"
@@ -43,6 +44,7 @@
#include "hw/acpi/acpi_dev_interface.h"
#include "hw/intc/intc.h"
#include "hw/rdma/rdma.h"
+#include "monitor/stats.h"
NameInfo *qmp_query_name(Error **errp)
{
@@ -441,3 +443,96 @@ HumanReadableText *qmp_x_query_irq(Error **errp)
return human_readable_text_from_str(buf);
}
+
+typedef struct StatsCallbacks {
+ StatRetrieveFunc *stats_cb;
+ SchemaRetrieveFunc *schemas_cb;
+ QTAILQ_ENTRY(StatsCallbacks) next;
+} StatsCallbacks;
+
+static QTAILQ_HEAD(, StatsCallbacks) stats_callbacks =
+ QTAILQ_HEAD_INITIALIZER(stats_callbacks);
+
+void add_stats_callbacks(StatRetrieveFunc *stats_fn,
+ SchemaRetrieveFunc *schemas_fn)
+{
+ StatsCallbacks *entry = g_new(StatsCallbacks, 1);
+ entry->stats_cb = stats_fn;
+ entry->schemas_cb = schemas_fn;
+
+ QTAILQ_INSERT_TAIL(&stats_callbacks, entry, next);
+}
+
+static bool invoke_stats_cb(StatsCallbacks *entry,
+ StatsResultList **stats_results,
+ StatsFilter *filter,
+ Error **errp)
+{
+ ERRP_GUARD();
+
+ entry->stats_cb(stats_results, filter->target, errp);
+ if (*errp) {
+ qapi_free_StatsResultList(*stats_results);
+ *stats_results = NULL;
+ return false;
+ }
+ return true;
+}
+
+StatsResultList *qmp_query_stats(StatsFilter *filter, Error **errp)
+{
+ StatsResultList *stats_results = NULL;
+ StatsCallbacks *entry;
+
+ QTAILQ_FOREACH(entry, &stats_callbacks, next) {
+ if (!invoke_stats_cb(entry, &stats_results, filter, errp)) {
+ break;
+ }
+ }
+
+ return stats_results;
+}
+
+StatsSchemaList *qmp_query_stats_schemas(Error **errp)
+{
+ StatsSchemaList *stats_results = NULL;
+ StatsCallbacks *entry;
+ ERRP_GUARD();
+
+ QTAILQ_FOREACH(entry, &stats_callbacks, next) {
+ entry->schemas_cb(&stats_results, errp);
+ if (*errp) {
+ qapi_free_StatsSchemaList(stats_results);
+ return NULL;
+ }
+ }
+
+ return stats_results;
+}
+
+void add_stats_entry(StatsResultList **stats_results, StatsProvider provider,
+ const char *qom_path, StatsList *stats_list)
+{
+ StatsResult *entry = g_new0(StatsResult, 1);
+
+ entry->provider = provider;
+ if (qom_path) {
+ entry->has_qom_path = true;
+ entry->qom_path = g_strdup(qom_path);
+ }
+ entry->stats = stats_list;
+
+ QAPI_LIST_PREPEND(*stats_results, entry);
+}
+
+void add_stats_schema(StatsSchemaList **schema_results,
+ StatsProvider provider, StatsTarget target,
+ StatsSchemaValueList *stats_list)
+{
+ StatsSchema *entry = g_new0(StatsSchema, 1);
+
+ entry->provider = provider;
+ entry->target = target;
+ entry->stats = stats_list;
+ QAPI_LIST_PREPEND(*schema_results, entry);
+}
diff --git a/qapi/meson.build b/qapi/meson.build
index 656ef0e039..fd5c93d643 100644
--- a/qapi/meson.build
+++ b/qapi/meson.build
@@ -46,6 +46,7 @@ qapi_all_modules = [
'replay',
'run-state',
'sockets',
+ 'stats',
'trace',
'transaction',
'yank',
diff --git a/qapi/qapi-schema.json b/qapi/qapi-schema.json
index 4912b9744e..92d7ecc52c 100644
--- a/qapi/qapi-schema.json
+++ b/qapi/qapi-schema.json
@@ -93,3 +93,4 @@
{ 'include': 'audio.json' }
{ 'include': 'acpi.json' }
{ 'include': 'pci.json' }
+{ 'include': 'stats.json' }
diff --git a/qapi/stats.json b/qapi/stats.json
new file mode 100644
index 0000000000..ada0fbf26f
--- /dev/null
+++ b/qapi/stats.json
@@ -0,0 +1,216 @@
+# -*- Mode: Python -*-
+# vim: filetype=python
+#
+# Copyright (c) 2022 Oracle and/or its affiliates.
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or later.
+# See the COPYING file in the top-level directory.
+#
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+##
+# = Statistics
+##
+
+##
+# @StatsType:
+#
+# Enumeration of statistics types
+#
+# @cumulative: stat is cumulative; value can only increase.
+# @instant: stat is instantaneous; value can increase or decrease.
+# @peak: stat is the peak value; value can only increase.
+# @linear-histogram: stat is a linear histogram.
+# @log2-histogram: stat is a logarithmic histogram, with one bucket
+# for each power of two.
+#
+# Since: 7.1
+##
+{ 'enum' : 'StatsType',
+ 'data' : [ 'cumulative', 'instant', 'peak', 'linear-histogram',
+ 'log2-histogram' ] }
+
+##
+# @StatsUnit:
+#
+# Enumeration of unit of measurement for statistics
+#
+# @bytes: stat reported in bytes.
+# @seconds: stat reported in seconds.
+# @cycles: stat reported in clock cycles.
+#
+# Since: 7.1
+##
+{ 'enum' : 'StatsUnit',
+ 'data' : [ 'bytes', 'seconds', 'cycles' ] }
+
+##
+# @StatsProvider:
+#
+# Enumeration of statistics providers.
+#
+# Since: 7.1
+##
+{ 'enum': 'StatsProvider',
+ 'data': [ ] }
+
+##
+# @StatsTarget:
+#
+# The kinds of objects on which one can request statistics.
+#
+# @vm: statistics that apply to the entire virtual machine or
+# the entire QEMU process.
+#
+# @vcpu: statistics that apply to a single virtual CPU.
+#
+# Since: 7.1
+##
+{ 'enum': 'StatsTarget',
+ 'data': [ 'vm', 'vcpu' ] }
+
+##
+# @StatsFilter:
+#
+# The arguments to the query-stats command; specifies a target for which to
+# request statistics.
+#
+# Since: 7.1
+##
+{ 'struct': 'StatsFilter',
+ 'data': { 'target': 'StatsTarget' } }
+
+##
+# @StatsValue:
+#
+# @scalar: single unsigned 64-bit integers.
+# @list: list of unsigned 64-bit integers (used for histograms).
+#
+# Since: 7.1
+##
+{ 'alternate': 'StatsValue',
+ 'data': { 'scalar': 'uint64',
+ 'list': [ 'uint64' ] } }
+
+##
+# @Stats:
+#
+# @name: name of stat.
+# @value: stat value.
+#
+# Since: 7.1
+##
+{ 'struct': 'Stats',
+ 'data': { 'name': 'str',
+ 'value' : 'StatsValue' } }
+
+##
+# @StatsResult:
+#
+# @provider: provider for this set of statistics.
+#
+# @qom-path: Path to the object for which the statistics are returned,
+# if the object is exposed in the QOM tree
+#
+# @stats: list of statistics.
+#
+# Since: 7.1
+##
+{ 'struct': 'StatsResult',
+ 'data': { 'provider': 'StatsProvider',
+ '*qom-path': 'str',
+ 'stats': [ 'Stats' ] } }
+
+##
+# @query-stats:
+#
+# Return runtime-collected statistics for objects such as the
+# VM or its vCPUs.
+#
+# The arguments are a StatsFilter and specify the provider and objects
+# to return statistics about.
+#
+# Returns: a list of StatsResult, one for each provider and object
+# (e.g., for each vCPU).
+#
+# Since: 7.1
+##
+{ 'command': 'query-stats',
+ 'data': 'StatsFilter',
+ 'boxed': true,
+ 'returns': [ 'StatsResult' ] }
+
+##
+# @StatsSchemaValue:
+#
+# Schema for a single statistic.
+#
+# @name: name of the statistic; each element of the schema is uniquely
+# identified by a target, a provider (both available in @StatsSchema)
+# and the name.
+#
+# @type: kind of statistic.
+#
+# @unit: basic unit of measure for the statistic; if missing, the statistic
+# is a simple number or counter.
+#
+# @base: base for the multiple of @unit in which the statistic is measured.
+# Only present if @exponent is non-zero; @base and @exponent together
+# form a SI prefix (e.g., _nano-_ for ``base=10`` and ``exponent=-9``)
+# or IEC binary prefix (e.g. _kibi-_ for ``base=2`` and ``exponent=10``)
+#
+# @exponent: exponent for the multiple of @unit in which the statistic is
+# expressed, or 0 for the basic unit
+#
+# @bucket-size: Present when @type is "linear-histogram", contains the width
+# of each bucket of the histogram.
+#
+# Since: 7.1
+##
+{ 'struct': 'StatsSchemaValue',
+ 'data': { 'name': 'str',
+ 'type': 'StatsType',
+ '*unit': 'StatsUnit',
+ '*base': 'int8',
+ 'exponent': 'int16',
+ '*bucket-size': 'uint32' } }
+
+##
+# @StatsSchema:
+#
+# Schema for all available statistics for a provider and target.
+#
+# @provider: provider for this set of statistics.
+#
+# @target: the kind of object that can be queried through the provider.
+#
+# @stats: list of statistics.
+#
+# Since: 7.1
+##
+{ 'struct': 'StatsSchema',
+ 'data': { 'provider': 'StatsProvider',
+ 'target': 'StatsTarget',
+ 'stats': [ 'StatsSchemaValue' ] } }
+
+##
+# @query-stats-schemas:
+#
+# Return the schema for all avaif them might be renamed. A statistic might go away if
+# an algorithm is changed or some code is removed; changing a default
+# might cause previously useful statistics to always report 0. Such
+# changes, however, are expected to be rare.
+#
+# Since: 7.1
+##
+{ 'command': 'query-stats-schemas',
+ 'data': { },
+ 'returns': [ 'StatsSchema' ] }
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 01/10] qmp: Support for querying stats Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-06-07 17:44 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 03/10] qmp: add filtering of statistics by target vCPU Paolo Bonzini
` (7 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert, Mark Kanda
From: Mark Kanda <mark.kanda@oracle.com>
Add support for querying fd-based KVM stats - as introduced by Linux kernel
commit:
cb082bfab59a ("KVM: stats: Add fd-based API to read binary stats data")
This allows the user to analyze the behavior of the VM without access
to debugfs.
Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
accel/kvm/kvm-all.c | 397 ++++++++++++++++++++++++++++++++++++++++++++
qapi/stats.json | 2 +-
2 files changed, 398 insertions(+), 1 deletion(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 32e177bd26..c027536419 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -47,6 +47,7 @@
#include "kvm-cpus.h"
#include "hw/boards.h"
+#include "monitor/stats.h"
/* This check must be after config-host.h is included */
#ifdef CONFIG_EVENTFD
@@ -2310,6 +2311,9 @@ bool kvm_dirty_ring_enabled(void)
return kvm_state->kvm_dirty_ring_size ? true : false;
}
+static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp);
+static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp);
+
static int kvm_init(MachineState *ms)
{
MachineClass *mc = MACHINE_GET_CLASS(ms);
@@ -2638,6 +2642,10 @@ static int kvm_init(MachineState *ms)
}
}
+ if (kvm_check_extension(kvm_state, KVM_CAP_BINARY_STATS_FD)) {
+ add_stats_callbacks(query_stats_cb, query_stats_schemas_cb);
+ }
+
return 0;
err:
@@ -3697,3 +3705,392 @@ static void kvm_type_init(void)
}
type_init(kvm_type_init);
+
+typedef struct StatsArgs {
+ union StatsResultsType {
+ StatsResultList **stats;
+ StatsSchemaList **schema;
+ } result;
+ Error **errp;
+} StatsArgs;
+
+static StatsList *add_kvmstat_entry(struct kvm_stats_desc *pdesc,
+ uint64_t *stats_data,
+ StatsList *stats_list,
+ Error **errp)
+{
+
+ Stats *stats;
+ uint64List *val_list = NULL;
+
+ /* Only add stats that we understand. */
+ switch (pdesc->flags & KVM_STATS_TYPE_MASK) {
+ case KVM_STATS_TYPE_CUMULATIVE:
+ case KVM_STATS_TYPE_INSTANT:
+ case KVM_STATS_TYPE_PEAK:
+ case KVM_STATS_TYPE_LINEAR_HIST:
+ case KVM_STATS_TYPE_LOG_HIST:
+ break;
+ default:
+ return stats_list;
+ }
+
+ switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
+ case KVM_STATS_UNIT_NONE:
+ case KVM_STATS_UNIT_BYTES:
+ case KVM_STATS_UNIT_CYCLES:
+ case KVM_STATS_UNIT_SECONDS:
+ break;
+ default:
+ return stats_list;
+ }
+
+ switch (pdesc->flags & KVM_STATS_BASE_MASK) {
+ case KVM_STATS_BASE_POW10:
+ case KVM_STATS_BASE_POW2:
+ break;
+ default:
+ return stats_list;
+ }
+
+ /* Alloc and populate data list */
+ stats = g_new0(Stats, 1);
+ stats->name = g_strdup(pdesc->name);
+ stats->value = g_new0(StatsValue, 1);;
+
+ if (pdesc->size == 1) {
+ stats->value->u.scalar = *stats_data;
+ stats->value->type = QTYPE_QNUM;
+ } else {
+ int i;
+ for (i = 0; i < pdesc->size; i++) {
+ QAPI_LIST_PREPEND(val_list, stats_data[i]);
+ }
+ stats->value->u.list = val_list;
+ stats->value->type = QTYPE_QLIST;
+ }
+
+ QAPI_LIST_PREPEND(stats_list, stats);
+ return stats_list;
+}
+
+static StatsSchemaValueList *add_kvmschema_entry(struct kvm_stats_desc *pdesc,
+ StatsSchemaValueList *list,
+ Error **errp)
+{
+ StatsSchemaValueList *schema_entry = g_new0(StatsSchemaValueList, 1);
+ schema_entry->value = g_new0(StatsSchemaValue, 1);
+
+ switch (pdesc->flags & KVM_STATS_TYPE_MASK) {
+ case KVM_STATS_TYPE_CUMULATIVE:
+ schema_entry->value->type = STATS_TYPE_CUMULATIVE;
+ break;
+ case KVM_STATS_TYPE_INSTANT:
+ schema_entry->value->type = STATS_TYPE_INSTANT;
+ break;
+ case KVM_STATS_TYPE_PEAK:
+ schema_entry->value->type = STATS_TYPE_PEAK;
+ break;
+ case KVM_STATS_TYPE_LINEAR_HIST:
+ schema_entry->value->type = STATS_TYPE_LINEAR_HISTOGRAM;
+ schema_entry->value->bucket_size = pdesc->bucket_size;
+ schema_entry->value->has_bucket_size = true;
+ break;
+ case KVM_STATS_TYPE_LOG_HIST:
+ schema_entry->value->type = STATS_TYPE_LOG2_HISTOGRAM;
+ break;
+ default:
+ goto exit;
+ }
+
+ switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
+ case KVM_STATS_UNIT_NONE:
+ break;
+ case KVM_STATS_UNIT_BYTES:
+ schema_entry->value->has_unit = true;
+ schema_entry->value->unit = STATS_UNIT_BYTES;
+ break;
+ case KVM_STATS_UNIT_CYCLES:
+ schema_entry->value->has_unit = true;
+ schema_entry->value->unit = STATS_UNIT_CYCLES;
+ break;
+ case KVM_STATS_UNIT_SECONDS:
+ schema_entry->value->has_unit = true;
+ schema_entry->value->unit = STATS_UNIT_SECONDS;
+ break;
+ default:
+ goto exit;
+ }
+
+ schema_entry->value->exponent = pdesc->exponent;
+ if (pdesc->exponent) {
+ switch (pdesc->flags & KVM_STATS_BASE_MASK) {
+ case KVM_STATS_BASE_POW10:
+ schema_entry->value->has_base = true;
+ schema_entry->value->base = 10;
+ break;
+ case KVM_STATS_BASE_POW2:
+ schema_entry->value->has_base = true;
+ schema_entry->value->base = 2;
+ break;
+ default:
+ goto exit;
+ }
+ }
+
+ schema_entry->value->name = g_strdup(pdesc->name);
+ schema_entry->next = list;
+ return schema_entry;
+exit:
+ g_free(schema_entry->value);
+ g_free(schema_entry);
+ return list;
+}
+
+/* Cached stats descriptors */
+typedef struct StatsDescriptors {
+ char *ident; /* 'vm' or vCPU qom path */
+ struct kvm_stats_desc *kvm_stats_desc;
+ struct kvm_stats_header *kvm_stats_header;
+ QTAILQ_ENTRY(StatsDescriptors) next;
+} StatsDescriptors;
+
+static QTAILQ_HEAD(, StatsDescriptors) stats_descriptors =
+ QTAILQ_HEAD_INITIALIZER(stats_descriptors);
+
+static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd,
+ Error **errp)
+{
+ StatsDescriptors *descriptors;
+ const char *ident;
+ struct kvm_stats_desc *kvm_stats_desc;
+ struct kvm_stats_header *kvm_stats_header;
+ size_t size_desc;
+ ssize_t ret;
+
+ switch (target) {
+ case STATS_TARGET_VM:
+ ident = StatsTarget_str(STATS_TARGET_VM);
+ break;
+ case STATS_TARGET_VCPU:
+ ident = current_cpu->parent_obj.canonical_path;
+ break;
+ default:
+ abort();
+ }
+
+ QTAILQ_FOREACH(descriptors, &stats_descriptors, next) {
+ if (g_str_equal(descriptors->ident, ident)) {
+ return descriptors;
+ }
+ }
+
+ descriptors = g_new0(StatsDescriptors, 1);
+
+ /* Read stats header */
+ kvm_stats_header = g_malloc(sizeof(*kvm_stats_header));
+ ret = read(stats_fd, kvm_stats_header, sizeof(*kvm_stats_header));
+ if (ret != sizeof(*kvm_stats_header)) {
+ error_setg(errp, "KVM stats: failed to read stats header: "
+ "expected %zu actual %zu",
+ sizeof(*kvm_stats_header), ret);
+ return NULL;
+ }
+ size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
+
+ /* Read stats descriptors */
+ kvm_stats_desc = g_malloc0_n(kvm_stats_header->num_desc, size_desc);
+ ret = pread(stats_fd, kvm_stats_desc,
+ size_desc * kvm_stats_header->num_desc,
+ kvm_stats_header->desc_offset);
+
+ if (ret != size_desc * kvm_stats_header->num_desc) {
+ error_setg(errp, "KVM stats: failed to read stats descriptors: "
+ "expected %zu actual %zu",
+ size_desc * kvm_stats_header->num_desc, ret);
+ g_free(descriptors);
+ return NULL;
+ }
+ descriptors->kvm_stats_header = kvm_stats_header;
+ descriptors->kvm_stats_desc = kvm_stats_desc;
+ descriptors->ident = g_strdup(ident);
+ QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next);
+ return descriptors;
+}
+
+static void query_stats(StatsResultList **result, StatsTarget target,
+ int stats_fd, Error **errp)
+{
+ struct kvm_stats_desc *kvm_stats_desc;
+ struct kvm_stats_header *kvm_stats_header;
+ StatsDescriptors *descriptors;
+ g_autofree uint64_t *stats_data = NULL;
+ struct kvm_stats_desc *pdesc;
+ StatsList *stats_list = NULL;
+ size_t size_desc, size_data = 0;
+ ssize_t ret;
+ int i;
+
+ descriptors = find_stats_descriptors(target, stats_fd, errp);
+ if (!descriptors) {
+ return;
+ }
+
+ kvm_stats_header = descriptors->kvm_stats_header;
+ kvm_stats_desc = descriptors->kvm_stats_desc;
+ size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
+
+ /* Tally the total data size; read schema data */
+ for (i = 0; i < kvm_stats_header->num_desc; ++i) {
+ pdesc = (void *)kvm_stats_desc + i * size_desc;
+ size_data += pdesc->size * sizeof(*stats_data);
+ }
+
+ stats_data = g_malloc0(size_data);
+ ret = pread(stats_fd, stats_data, size_data, kvm_stats_header->data_offset);
+
+ if (ret != size_data) {
+ error_setg(errp, "KVM stats: failed to read data: "
+ "expected %zu actual %zu", size_data, ret);
+ return;
+ }
+
+ for (i = 0; i < kvm_stats_header->num_desc; ++i) {
+ uint64_t *stats;
+ pdesc = (void *)kvm_stats_desc + i * size_desc;
+
+ /* Add entry to the list */
+ stats = (void *)stats_data + pdesc->offset;
+ stats_list = add_kvmstat_entry(pdesc, stats, stats_list, errp);
+ }
+
+ if (!stats_list) {
+ return;
+ }
+
+ switch (target) {
+ case STATS_TARGET_VM:
+ add_stats_entry(result, STATS_PROVIDER_KVM, NULL, stats_list);
+ break;
+ case STATS_TARGET_VCPU:
+ add_stats_entry(result, STATS_PROVIDER_KVM,
+ current_cpu->parent_obj.canonical_path,
+ stats_list);
+ break;
+ default:
+ break;
+ }
+}
+
+static void query_stats_schema(StatsSchemaList **result, StatsTarget target,
+ int stats_fd, Error **errp)
+{
+ struct kvm_stats_desc *kvm_stats_desc;
+ struct kvm_stats_header *kvm_stats_header;
+ StatsDescriptors *descriptors;
+ struct kvm_stats_desc *pdesc;
+ StatsSchemaValueList *stats_list = NULL;
+ size_t size_desc;
+ int i;
+
+ descriptors = find_stats_descriptors(target, stats_fd, errp);
+ if (!descriptors) {
+ return;
+ }
+
+ kvm_stats_header = descriptors->kvm_stats_header;
+ kvm_stats_desc = descriptors->kvm_stats_desc;
+ size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
+
+ /* Tally the total data size; read schema data */
+ for (i = 0; i < kvm_stats_header->num_desc; ++i) {
+ pdesc = (void *)kvm_stats_desc + i * size_desc;
+ stats_list = add_kvmschema_entry(pdesc, stats_list, errp);
+ }
+
+ add_stats_schema(result, STATS_PROVIDER_KVM, target, stats_list);
+}
+
+static void query_stats_vcpu(CPUState *cpu, run_on_cpu_data data)
+{
+ StatsArgs *kvm_stats_args = (StatsArgs *) data.host_ptr;
+ int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
+ Error *local_err = NULL;
+
+ if (stats_fd == -1) {
+ error_setg_errno(&local_err, errno, "KVM stats: ioctl failed");
+ error_propagate(kvm_stats_args->errp, local_err);
+ return;
+ }
+ query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, stats_fd,
+ kvm_stats_args->errp);
+ close(stats_fd);
+}
+
+static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data)
+{
+ StatsArgs *kvm_stats_args = (StatsArgs *) data.host_ptr;
+ int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
+ Error *local_err = NULL;
+
+ if (stats_fd == -1) {
+ error_setg_errno(&local_err, errno, "KVM stats: ioctl failed");
+ error_propagate(kvm_stats_args->errp, local_err);
+ return;
+ }
+ query_stats_schema(kvm_stats_args->result.schema, STATS_TARGET_VCPU, stats_fd,
+ kvm_stats_args->errp);
+ close(stats_fd);
+}
+
+static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp)
+{
+ KVMState *s = kvm_state;
+ CPUState *cpu;
+ int stats_fd;
+
+ switch (target) {
+ case STATS_TARGET_VM:
+ {
+ stats_fd = kvm_vm_ioctl(s, KVM_GET_STATS_FD, NULL);
+ if (stats_fd == -1) {
+ error_setg_errno(errp, errno, "KVM errno, stats: ioctl failed");
+ return;
+ }
+ query_stats(result, target, stats_fd, errp);
+ close(stats_fd);
+ break;
+ }
+ case STATS_TARGET_VCPU:
+ {
+ StatsArgs stats_args;
+ stats_args.result.stats = result;
+ stats_args.errp = errp;
+ CPU_FOREACH(cpu) {
+ run_on_cpu(cpu, query_stats_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args));
+ }
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+void query_stats_schemas_cb(StatsSchemaList **result, Error **errp)
+{
+ StatsArgs stats_args;
+ KVMState *s = kvm_state;
+ int stats_fd;
+
+ stats_fd = kvm_vm_ioctl(s, KVM_GET_STATS_FD, NULL);
+ if (stats_fd == -1) {
+ error_setg(errp, "KVM stats: ioctl failed");
+ return;
+ }
+ query_stats_schema(result, STATS_TARGET_VM, stats_fd, errp);
+ close(stats_fd);
+
+ stats_args.result.schema = result;
+ stats_args.errp = errp;
+ run_on_cpu(first_cpu, query_stats_schema_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args));
+}
diff --git a/qapi/stats.json b/qapi/stats.json
index ada0fbf26f..df7c4d886c 100644
--- a/qapi/stats.json
+++ b/qapi/stats.json
@@ -52,7 +52,7 @@
# Since: 7.1
##
{ 'enum': 'StatsProvider',
- 'data': [ ] }
+ 'data': [ 'kvm' ] }
##
# @StatsTarget:
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 03/10] qmp: add filtering of statistics by target vCPU
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 01/10] qmp: Support for querying stats Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 02/10] kvm: Support for querying fd-based stats Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi" Paolo Bonzini
` (6 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
Introduce a simple filtering of statistics, that allows to retrieve
statistics for a subset of the guest vCPUs. This will be used for
example by the HMP monitor, in order to retrieve the statistics
for the currently selected CPU.
Example:
{ "execute": "query-stats",
"arguments": {
"target": "vcpu",
"vcpus": [ "/machine/unattached/device[2]",
"/machine/unattached/device[4]" ] } }
Extracted from a patch by Mark Kanda.
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
I left the Reviewed-by here as well.
accel/kvm/kvm-all.c | 9 +++++++--
include/monitor/stats.h | 11 ++++++++++-
monitor/qmp-cmds.c | 34 +++++++++++++++++++++++++++++++++-
qapi/stats.json | 24 +++++++++++++++++++-----
4 files changed, 69 insertions(+), 9 deletions(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index c027536419..d75fb3d95c 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2311,7 +2311,8 @@ bool kvm_dirty_ring_enabled(void)
return kvm_state->kvm_dirty_ring_size ? true : false;
}
-static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp);
+static void query_stats_cb(StatsResultList **result, StatsTarget target,
+ strList *targets, Error **errp);
static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp);
static int kvm_init(MachineState *ms)
@@ -4043,7 +4044,8 @@ static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data)
close(stats_fd);
}
-static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp)
+static void query_stats_cb(StatsResultList **result, StatsTarget target,
+ strList *targets, Error **errp)
{
KVMState *s = kvm_state;
CPUState *cpu;
@@ -4067,6 +4069,9 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target, Error *
stats_args.result.stats = result;
stats_args.errp = errp;
CPU_FOREACH(cpu) {
+ if (!apply_str_list_filter(cpu->parent_obj.canonical_path, targets)) {
+ continue;
+ }
run_on_cpu(cpu, query_stats_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args));
}
break;
diff --git a/include/monitor/stats.h b/include/monitor/stats.h
index 912eeadb2f..8c50feeaa9 100644
--- a/include/monitor/stats.h
+++ b/include/monitor/stats.h
@@ -11,7 +11,7 @@
#include "qapi/qapi-types-stats.h"
typedef void StatRetrieveFunc(StatsResultList **result, StatsTarget target,
- Error **errp);
+ strList *targets, Error **errp);
typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
/*
@@ -31,4 +31,13 @@ void add_stats_entry(StatsResultList **, StatsProvider, const char *id,
void add_stats_schema(StatsSchemaList **, StatsProvider, StatsTarget,
StatsSchemaValueList *);
+/*
+ * True if a string matches the filter passed to the stats_fn callabck,
+ * false otherwise.
+ *
+ * Note that an empty list means no filtering, i.e. all strings will
+ * return true.
+ */
+bool apply_str_list_filter(const char *string, strList *list);
+
#endif /* STATS_H */
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index a6ac8d7473..5f8f1e620b 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -468,9 +468,26 @@ static bool invoke_stats_cb(StatsCallbacks *entry,
StatsFilter *filter,
Error **errp)
{
+ strList *targets = NULL;
ERRP_GUARD();
- entry->stats_cb(stats_results, filter->target, errp);
+ switch (filter->target) {
+ case STATS_TARGET_VM:
+ break;
+ case STATS_TARGET_VCPU:
+ if (filter->u.vcpu.has_vcpus) {
+ if (!filter->u.vcpu.vcpus) {
+ /* No targets allowed? Return no statistics. */
+ return true;
+ }
+ targets = filter->u.vcpu.vcpus;
+ }
+ break;
+ default:
+ abort();
+ }
+
+ entry->stats_cb(stats_results, filter->target, targets, errp);
if (*errp) {
qapi_free_StatsResultList(*stats_results);
*stats_results = NULL;
@@ -536,3 +553,18 @@ void add_stats_schema(StatsSchemaList **schema_results,
entry->stats = stats_list;
QAPI_LIST_PREPEND(*schema_results, entry);
}
+
+bool apply_str_list_filter(const char *string, strList *list)
+{
+ strList *str_list = NULL;
+
+ if (!list) {
+ return true;
+ }
+ for (str_list = list; str_list; str_list = str_list->next) {
+ if (g_str_equal(string, str_list->value)) {
+ return true;
+ }
+ }
+ return false;
+}
diff --git a/qapi/stats.json b/qapi/stats.json
index df7c4d886c..8c9abb57f1 100644
--- a/qapi/stats.json
+++ b/qapi/stats.json
@@ -70,15 +70,29 @@
'data': [ 'vm', 'vcpu' ] }
##
-# @StatsFilter:
+# @StatsVCPUFilter:
#
-# The arguments to the query-stats command; specifies a target for which to
-# request statistics.
+# @vcpus: list of QOM paths for the desired vCPU objects.
#
# Since: 7.1
##
-{ 'struct': 'StatsFilter',
- 'data': { 'target': 'StatsTarget' } }
+{ 'struct': 'StatsVCPUFilter',
+ 'data': { '*vcpus': [ 'str' ] } }
+
+##
+# @StatsFilter:
+#
+# The arguments to the query-stats command; specifies a target for which to
+# request statistics and optionally the required subset of information for
+# that target:
+# - which vCPUs to request statistics for
+#
+# Since: 7.1
+##
+{ 'union': 'StatsFilter',
+ 'base': { 'target': 'StatsTarget' },
+ 'discriminator': 'target',
+ 'data': { 'vcpu': 'StatsVCPUFilter' } }
##
# @StatsValue:
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi"
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (2 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 03/10] qmp: add filtering of statistics by target vCPU Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-05-30 21:56 ` Philippe Mathieu-Daudé via
2022-05-30 15:07 ` [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes Paolo Bonzini
` (5 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
The correct abbreviations use a lowercase k, so adjust freq_to_str
and size_to_str accordingly and add tests.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
tests/unit/test-cutils.c | 20 ++++++++++++++++++++
util/cutils.c | 6 +++---
2 files changed, 23 insertions(+), 3 deletions(-)
diff --git a/tests/unit/test-cutils.c b/tests/unit/test-cutils.c
index 98671f1ac3..783127ff0e 100644
--- a/tests/unit/test-cutils.c
+++ b/tests/unit/test-cutils.c
@@ -2450,6 +2450,22 @@ static void test_qemu_strtosz_metric(void)
g_assert(endptr == str + 7);
}
+static void test_freq_to_str(void)
+{
+ g_assert_cmpstr(freq_to_str(999), ==, "999 Hz");
+ g_assert_cmpstr(freq_to_str(1000), ==, "1 kHz");
+ g_assert_cmpstr(freq_to_str(1010), ==, "1.01 kHz");
+}
+
+static void test_size_to_str(void)
+{
+ g_assert_cmpstr(size_to_str(0), ==, "0 B");
+ g_assert_cmpstr(size_to_str(1), ==, "1 B");
+ g_assert_cmpstr(size_to_str(1016), ==, "0.992 kiB");
+ g_assert_cmpstr(size_to_str(1024), ==, "1 kiB");
+ g_assert_cmpstr(size_to_str(512ull << 20), ==, "512 MiB");
+}
+
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
@@ -2729,5 +2745,9 @@ int main(int argc, char **argv)
g_test_add_func("/cutils/strtosz/metric",
test_qemu_strtosz_metric);
+ g_test_add_func("/cutils/size_to_str",
+ test_size_to_str);
+ g_test_add_func("/cutils/freq_to_str",
+ test_freq_to_str);
return g_test_run();
}
diff --git a/util/cutils.c b/util/cutils.c
index a58bcfd80e..19fb4d04f8 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -875,12 +875,12 @@ int parse_debug_env(const char *name, int max, int initial)
/*
* Return human readable string for size @val.
* @val can be anything that uint64_t allows (no more than "16 EiB").
- * Use IEC binary units like KiB, MiB, and so forth.
+ * Use IEC binary units like kiB, MiB, and so forth.
* Caller is responsible for passing it to g_free().
*/
char *size_to_str(uint64_t val)
{
- static const char *suffixes[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
+ static const char *suffixes[] = { "", "ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
uint64_t div;
int i;
@@ -899,7 +899,7 @@ char *size_to_str(uint64_t val)
char *freq_to_str(uint64_t freq_hz)
{
- static const char *const suffixes[] = { "", "K", "M", "G", "T", "P", "E" };
+ static const char *const suffixes[] = { "", "k", "M", "G", "T", "P", "E" };
double freq = freq_hz;
size_t idx = 0;
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (3 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi" Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-05-30 21:59 ` Philippe Mathieu-Daudé via
2022-05-30 15:07 ` [PATCH v5 06/10] hmp: add basic "info stats" implementation Paolo Bonzini
` (4 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
Extract the knowledge of IEC and SI prefixes out of size_to_str and
freq_to_str, so that it can be reused when printing statistics.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
include/qemu/cutils.h | 18 ++++++++++++++++++
tests/unit/test-cutils.c | 32 ++++++++++++++++++++++++++++++++
util/cutils.c | 34 +++++++++++++++++++++++++---------
3 files changed, 75 insertions(+), 9 deletions(-)
diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
index 40e10e19a7..d3e532b64c 100644
--- a/include/qemu/cutils.h
+++ b/include/qemu/cutils.h
@@ -1,6 +1,24 @@
#ifndef QEMU_CUTILS_H
#define QEMU_CUTILS_H
+/*
+ * si_prefix:
+ * @exp10: exponent of 10, a multiple of 3 between -18 and 18 inclusive.
+ *
+ * Return a SI prefix (n, u, m, K, M, etc.) corresponding
+ * to the given exponent of 10.
+ */
+const char *si_prefix(unsigned int exp10);
+
+/*
+ * iec_binary_prefix:
+ * @exp2: exponent of 2, a multiple of 10 between 0 and 60 inclusive.
+ *
+ * Return an IEC binary prefix (Ki, Mi, etc.) corresponding
+ * to the given exponent of 2.
+ */
+const char *iec_binary_prefix(unsigned int exp2);
+
/**
* pstrcpy:
* @buf: buffer to copy string into
diff --git a/tests/unit/test-cutils.c b/tests/unit/test-cutils.c
index 783127ff0e..5696ce94de 100644
--- a/tests/unit/test-cutils.c
+++ b/tests/unit/test-cutils.c
@@ -2466,6 +2466,34 @@ static void test_size_to_str(void)
g_assert_cmpstr(size_to_str(512ull << 20), ==, "512 MiB");
}
+static void test_iec_binary_prefix(void)
+{
+ g_assert_cmpstr(iec_binary_prefix(0), ==, "");
+ g_assert_cmpstr(iec_binary_prefix(10), ==, "ki");
+ g_assert_cmpstr(iec_binary_prefix(20), ==, "Mi");
+ g_assert_cmpstr(iec_binary_prefix(30), ==, "Gi");
+ g_assert_cmpstr(iec_binary_prefix(40), ==, "Ti");
+ g_assert_cmpstr(iec_binary_prefix(50), ==, "Pi");
+ g_assert_cmpstr(iec_binary_prefix(60), ==, "Ei");
+}
+
+static void test_si_prefix(void)
+{
+ g_assert_cmpstr(si_prefix(-18), ==, "a");
+ g_assert_cmpstr(si_prefix(-15), ==, "f");
+ g_assert_cmpstr(si_prefix(-12), ==, "p");
+ g_assert_cmpstr(si_prefix(-9), ==, "n");
+ g_assert_cmpstr(si_prefix(-6), ==, "u");
+ g_assert_cmpstr(si_prefix(-3), ==, "m");
+ g_assert_cmpstr(si_prefix(0), ==, "");
+ g_assert_cmpstr(si_prefix(3), ==, "k");
+ g_assert_cmpstr(si_prefix(6), ==, "M");
+ g_assert_cmpstr(si_prefix(9), ==, "G");
+ g_assert_cmpstr(si_prefix(12), ==, "T");
+ g_assert_cmpstr(si_prefix(15), ==, "P");
+ g_assert_cmpstr(si_prefix(18), ==, "E");
+}
+
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
@@ -2749,5 +2777,9 @@ int main(int argc, char **argv)
test_size_to_str);
g_test_add_func("/cutils/freq_to_str",
test_freq_to_str);
+ g_test_add_func("/cutils/iec_binary_prefix",
+ test_iec_binary_prefix);
+ g_test_add_func("/cutils/si_prefix",
+ test_si_prefix);
return g_test_run();
}
diff --git a/util/cutils.c b/util/cutils.c
index 19fb4d04f8..485e9b0cea 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -872,6 +872,25 @@ int parse_debug_env(const char *name, int max, int initial)
return debug;
}
+const char *si_prefix(unsigned int exp10)
+{
+ static const char *prefixes[] = {
+ "a", "f", "p", "n", "u", "m", "", "k", "M", "G", "T", "P", "E"
+ };
+
+ exp10 += 18;
+ assert(exp10 % 3 == 0 && exp10 / 3 < ARRAY_SIZE(prefixes));
+ return prefixes[exp10 / 3];
+}
+
+const char *iec_binary_prefix(unsigned int exp2)
+{
+ static const char *prefixes[] = { "", "ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
+
+ assert(exp2 % 10 == 0 && exp2 / 10 < ARRAY_SIZE(prefixes));
+ return prefixes[exp2 / 10];
+}
+
/*
* Return human readable string for size @val.
* @val can be anything that uint64_t allows (no more than "16 EiB").
@@ -880,7 +899,6 @@ int parse_debug_env(const char *name, int max, int initial)
*/
char *size_to_str(uint64_t val)
{
- static const char *suffixes[] = { "", "ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
uint64_t div;
int i;
@@ -891,25 +909,23 @@ char *size_to_str(uint64_t val)
* (see e41b509d68afb1f for more info)
*/
frexp(val / (1000.0 / 1024.0), &i);
- i = (i - 1) / 10;
- div = 1ULL << (i * 10);
+ i = (i - 1) / 10 * 10;
+ div = 1ULL << i;
- return g_strdup_printf("%0.3g %sB", (double)val / div, suffixes[i]);
+ return g_strdup_printf("%0.3g %sB", (double)val / div, iec_binary_prefix(i));
}
char *freq_to_str(uint64_t freq_hz)
{
- static const char *const suffixes[] = { "", "k", "M", "G", "T", "P", "E" };
double freq = freq_hz;
- size_t idx = 0;
+ size_t exp10 = 0;
while (freq >= 1000.0) {
freq /= 1000.0;
- idx++;
+ exp10 += 3;
}
- assert(idx < ARRAY_SIZE(suffixes));
- return g_strdup_printf("%0.3g %sHz", freq, suffixes[idx]);
+ return g_strdup_printf("%0.3g %sHz", freq, si_prefix(exp10));
}
int qemu_pstrcmp0(const char **str1, const char **str2)
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 06/10] hmp: add basic "info stats" implementation
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (4 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-06-07 18:35 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 07/10] qmp: add filtering of statistics by provider Paolo Bonzini
` (3 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert, Mark Kanda
From: Mark Kanda <mark.kanda@oracle.com>
Add an HMP command to retrieve statistics collected at run-time.
The command will retrieve and print either all VM-level statistics,
or all vCPU-level statistics for the currently selected CPU.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hmp-commands-info.hx | 13 +++
include/monitor/hmp.h | 1 +
monitor/hmp-cmds.c | 190 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 204 insertions(+)
diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index 834bed089e..28757768f7 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -894,3 +894,16 @@ SRST
``info via``
Show guest mos6522 VIA devices.
ERST
+
+ {
+ .name = "stats",
+ .args_type = "target:s",
+ .params = "target",
+ .help = "show statistics; target is either vm or vcpu",
+ .cmd = hmp_info_stats,
+ },
+
+SRST
+ ``stats``
+ Show runtime-collected statistics
+ERST
diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
index 96d014826a..2e89a97bd6 100644
--- a/include/monitor/hmp.h
+++ b/include/monitor/hmp.h
@@ -133,5 +133,6 @@ void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict);
void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict);
void hmp_human_readable_text_helper(Monitor *mon,
HumanReadableText *(*qmp_handler)(Error **));
+void hmp_info_stats(Monitor *mon, const QDict *qdict);
#endif
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 622c783c32..55b83c0a3a 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -40,6 +40,7 @@
#include "qapi/qapi-commands-pci.h"
#include "qapi/qapi-commands-rocker.h"
#include "qapi/qapi-commands-run-state.h"
+#include "qapi/qapi-commands-stats.h"
#include "qapi/qapi-commands-tpm.h"
#include "qapi/qapi-commands-ui.h"
#include "qapi/qapi-visit-net.h"
@@ -52,6 +53,7 @@
#include "ui/console.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
+#include "hw/core/cpu.h"
#include "hw/intc/intc.h"
#include "migration/snapshot.h"
#include "migration/misc.h"
@@ -2239,3 +2241,191 @@ void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict)
}
hmp_handle_error(mon, err);
}
+
+static void print_stats_schema_value(Monitor *mon, StatsSchemaValue *value)
+{
+ const char *unit = NULL;
+ monitor_printf(mon, " %s (%s%s", value->name, StatsType_str(value->type),
+ value->has_unit || value->exponent ? ", " : "");
+
+ if (value->has_unit) {
+ if (value->unit == STATS_UNIT_SECONDS) {
+ unit = "s";
+ } else if (value->unit == STATS_UNIT_BYTES) {
+ unit = "B";
+ }
+ }
+
+ if (unit && value->base == 10 &&
+ value->exponent >= -9 && value->exponent <= 0 &&
+ value->exponent % 3 == 0) {
+ monitor_printf(mon, "%s", si_prefix(value->exponent));
+ } else if (unit && value->base == 2 &&
+ value->exponent >= 0 && value->exponent <= 40 &&
+ value->exponent % 10 == 0) {
+
+ monitor_printf(mon, "%s", iec_binary_prefix(value->exponent));
+ } else if (value->exponent) {
+ /* Use exponential notation and write the unit's English name */
+ monitor_printf(mon, "* %d^%d%s",
+ value->base, value->exponent,
+ value->has_unit ? " " : "");
+ unit = NULL;
+ }
+
+ if (value->has_unit) {
+ monitor_printf(mon, "%s", unit ? unit : StatsUnit_str(value->unit));
+ }
+
+ /* Print bucket size for linear histograms */
+ if (value->type == STATS_TYPE_LINEAR_HISTOGRAM && value->has_bucket_size) {
+ monitor_printf(mon, ", bucket size=%d", value->bucket_size);
+ }
+ monitor_printf(mon, ")");
+}
+
+static StatsSchemaValueList *find_schema_value_list(
+ StatsSchemaList *list, StatsProvider provider,
+ StatsTarget target)
+{
+ StatsSchemaList *node;
+
+ for (node = list; node; node = node->next) {
+ if (node->value->provider == provider &&
+ node->value->target == target) {
+ return node->value->stats;
+ }
+ }
+ return NULL;
+}
+
+static void print_stats_results(Monitor *mon, StatsTarget target,
+ StatsResult *result,
+ StatsSchemaList *schema)
+{
+ /* Find provider schema */
+ StatsSchemaValueList *schema_value_list =
+ find_schema_value_list(schema, result->provider, target);
+ StatsList *stats_list;
+
+ if (!schema_value_list) {
+ monitor_printf(mon, "failed to find schema list for %s\n",
+ StatsProvider_str(result->provider));
+ return;
+ }
+
+ monitor_printf(mon, "provider: %s\n",
+ StatsProvider_str(result->provider));
+
+ for (stats_list = result->stats; stats_list;
+ stats_list = stats_list->next,
+ schema_value_list = schema_value_list->next) {
+
+ Stats *stats = stats_list->value;
+ StatsValue *stats_value = stats->value;
+ StatsSchemaValue *schema_value = schema_value_list->value;
+
+ /* Find schema entry */
+ while (!g_str_equal(stats->name, schema_value->name)) {
+ if (!schema_value_list->next) {
+ monitor_printf(mon, "failed to find schema entry for %s\n",
+ stats->name);
+ return;
+ }
+ schema_value_list = schema_value_list->next;
+ schema_value = schema_value_list->value;
+ }
+
+ print_stats_schema_value(mon, schema_value);
+
+ if (stats_value->type == QTYPE_QNUM) {
+ monitor_printf(mon, ": %" PRId64 "\n", stats_value->u.scalar);
+ } else if (stats_value->type == QTYPE_QLIST) {
+ uint64List *list;
+ int i;
+
+ monitor_printf(mon, ": ");
+ for (list = stats_value->u.list, i = 1;
+ list;
+ list = list->next, i++) {
+ monitor_printf(mon, "[%d]=%" PRId64 " ", i, list->value);
+ }
+ monitor_printf(mon, "\n");
+ }
+ }
+}
+
+/* Create the StatsFilter that is needed for an "info stats" invocation. */
+static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
+{
+ StatsFilter *filter = g_malloc0(sizeof(*filter));
+
+ filter->target = target;
+ switch (target) {
+ case STATS_TARGET_VM:
+ break;
+ case STATS_TARGET_VCPU:
+ {
+ strList *vcpu_list = NULL;
+ CPUState *cpu = qemu_get_cpu(cpu_index);
+ char *canonical_path = object_get_canonical_path(OBJECT(cpu));
+
+ QAPI_LIST_PREPEND(vcpu_list, canonical_path);
+ filter->u.vcpu.has_vcpus = true;
+ filter->u.vcpu.vcpus = vcpu_list;
+ break;
+ }
+ default:
+ break;
+ }
+ return filter;
+}
+
+void hmp_info_stats(Monitor *mon, const QDict *qdict)
+{
+ const char *target_str = qdict_get_str(qdict, "target");
+ StatsTarget target;
+ Error *err = NULL;
+ g_autoptr(StatsSchemaList) schema = NULL;
+ g_autoptr(StatsResultList) stats = NULL;
+ g_autoptr(StatsFilter) filter = NULL;
+ StatsResultList *entry;
+
+ target = qapi_enum_parse(&StatsTarget_lookup, target_str, -1, &err);
+ if (err) {
+ monitor_printf(mon, "invalid stats target %s\n", target_str);
+ goto exit_no_print;
+ }
+
+ schema = qmp_query_stats_schemas(&err);
+ if (err) {
+ goto exit;
+ }
+
+ switch (target) {
+ case STATS_TARGET_VM:
+ filter = stats_filter(target, -1);
+ break;
+ case STATS_TARGET_VCPU: {}
+ int cpu_index = monitor_get_cpu_index(mon);
+ filter = stats_filter(target, cpu_index);
+ break;
+ default:
+ abort();
+ }
+
+ stats = qmp_query_stats(filter, &err);
+ if (err) {
+ goto exit;
+ }
+ for (entry = stats; entry; entry = entry->next) {
+ print_stats_results(mon, target, entry->value, schema);
+ }
+
+exit:
+ if (err) {
+ monitor_printf(mon, "%s\n", error_get_pretty(err));
+ }
+exit_no_print:
+ error_free(err);
+}
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 07/10] qmp: add filtering of statistics by provider
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (5 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 06/10] hmp: add basic "info stats" implementation Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-06-08 11:52 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 08/10] hmp: " Paolo Bonzini
` (2 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
Allow retrieving the statistics from a specific provider only.
This can be used in the future by HMP commands such as "info
sync-profile" or "info profile". The next patch also adds
filter-by-provider capabilities to the HMP equivalent of
query-stats, "info stats".
Example:
{ "execute": "query-stats",
"arguments": {
"target": "vm",
"providers": [
{ "provider": "kvm" } ] } }
The QAPI is a bit more verbose than just a list of StatsProvider,
so that it can be subsequently extended with filtering of statistics
by name.
If a provider is specified more than once in the filter, each request
will be included separately in the output.
Extracted from a patch by Mark Kanda.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
Here I removed the Reviewed-by because the effect of the new
implementation is especially marekd when you have multiple filters.
Before, all filters were evaluated first, and the callback was then
run if there was a match. Now, each filter is evaluated separately.
accel/kvm/kvm-all.c | 3 ++-
include/monitor/stats.h | 4 +++-
monitor/hmp-cmds.c | 2 +-
monitor/qmp-cmds.c | 41 ++++++++++++++++++++++++++++++++---------
qapi/stats.json | 19 +++++++++++++++++--
5 files changed, 55 insertions(+), 14 deletions(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index d75fb3d95c..66c4ac1ac6 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2644,7 +2644,8 @@ static int kvm_init(MachineState *ms)
}
if (kvm_check_extension(kvm_state, KVM_CAP_BINARY_STATS_FD)) {
- add_stats_callbacks(query_stats_cb, query_stats_schemas_cb);
+ add_stats_callbacks(STATS_PROVIDER_KVM, query_stats_cb,
+ query_stats_schemas_cb);
}
return 0;
diff --git a/include/monitor/stats.h b/include/monitor/stats.h
index 8c50feeaa9..80a523dd29 100644
--- a/include/monitor/stats.h
+++ b/include/monitor/stats.h
@@ -17,10 +17,12 @@ typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
/*
* Register callbacks for the QMP query-stats command.
*
+ * @provider: stats provider checked against QMP command arguments
* @stats_fn: routine to query stats:
* @schema_fn: routine to query stat schemas:
*/
-void add_stats_callbacks(StatRetrieveFunc *stats_fn,
+void add_stats_callbacks(StatsProvider provider,
+ StatRetrieveFunc *stats_fn,
SchemaRetrieveFunc *schemas_fn);
/*
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 55b83c0a3a..c501d1fa2b 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -2397,7 +2397,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
goto exit_no_print;
}
- schema = qmp_query_stats_schemas(&err);
+ schema = qmp_query_stats_schemas(false, STATS_PROVIDER__MAX, &err);
if (err) {
goto exit;
}
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index 5f8f1e620b..e49ab345d7 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -445,6 +445,7 @@ HumanReadableText *qmp_x_query_irq(Error **errp)
}
typedef struct StatsCallbacks {
+ StatsProvider provider;
StatRetrieveFunc *stats_cb;
SchemaRetrieveFunc *schemas_cb;
QTAILQ_ENTRY(StatsCallbacks) next;
@@ -453,10 +454,12 @@ typedef struct StatsCallbacks {
static QTAILQ_HEAD(, StatsCallbacks) stats_callbacks =
QTAILQ_HEAD_INITIALIZER(stats_callbacks);
-void add_stats_callbacks(StatRetrieveFunc *stats_fn,
+void add_stats_callbacks(StatsProvider provider,
+ StatRetrieveFunc *stats_fn,
SchemaRetrieveFunc *schemas_fn)
{
StatsCallbacks *entry = g_new(StatsCallbacks, 1);
+ entry->provider = provider;
entry->stats_cb = stats_fn;
entry->schemas_cb = schemas_fn;
@@ -465,12 +468,18 @@ void add_stats_callbacks(StatRetrieveFunc *stats_fn,
static bool invoke_stats_cb(StatsCallbacks *entry,
StatsResultList **stats_results,
- StatsFilter *filter,
+ StatsFilter *filter, StatsRequest *request,
Error **errp)
{
strList *targets = NULL;
ERRP_GUARD();
+ if (request) {
+ if (request->provider != entry->provider) {
+ return true;
+ }
+ }
+
switch (filter->target) {
case STATS_TARGET_VM:
break;
@@ -500,27 +509,41 @@ StatsResultList *qmp_query_stats(StatsFilter *filter, Error **errp)
{
StatsResultList *stats_results = NULL;
StatsCallbacks *entry;
+ StatsRequestList *request;
QTAILQ_FOREACH(entry, &stats_callbacks, next) {
- if (!invoke_stats_cb(entry, &stats_results, filter, errp)) {
- break;
+ if (filter->has_providers) {
+ for (request = filter->providers; request; request = request->next) {
+ if (!invoke_stats_cb(entry, &stats_results, filter,
+ request->value, errp)) {
+ break;
+ }
+ }
+ } else {
+ if (!invoke_stats_cb(entry, &stats_results, filter, NULL, errp)) {
+ break;
+ }
}
}
return stats_results;
}
-StatsSchemaList *qmp_query_stats_schemas(Error **errp)
+StatsSchemaList *qmp_query_stats_schemas(bool has_provider,
+ StatsProvider provider,
+ Error **errp)
{
StatsSchemaList *stats_results = NULL;
StatsCallbacks *entry;
ERRP_GUARD();
QTAILQ_FOREACH(entry, &stats_callbacks, next) {
- entry->schemas_cb(&stats_results, errp);
- if (*errp) {
- qapi_free_StatsSchemaList(stats_results);
- return NULL;
+ if (!has_provider || provider == entry->provider) {
+ entry->schemas_cb(&stats_results, errp);
+ if (*errp) {
+ qapi_free_StatsSchemaList(stats_results);
+ return NULL;
+ }
}
}
diff --git a/qapi/stats.json b/qapi/stats.json
index 8c9abb57f1..503918ea4c 100644
--- a/qapi/stats.json
+++ b/qapi/stats.json
@@ -69,6 +69,18 @@
{ 'enum': 'StatsTarget',
'data': [ 'vm', 'vcpu' ] }
+##
+# @StatsRequest:
+#
+# Indicates a set of statistics that should be returned by query-stats.
+#
+# @provider: provider for which to return statistics.
+#
+# Since: 7.1
+##
+{ 'struct': 'StatsRequest',
+ 'data': { 'provider': 'StatsProvider' } }
+
##
# @StatsVCPUFilter:
#
@@ -86,11 +98,14 @@
# request statistics and optionally the required subset of information for
# that target:
# - which vCPUs to request statistics for
+# - which providers to request statistics from
#
# Since: 7.1
##
{ 'union': 'StatsFilter',
- 'base': { 'target': 'StatsTarget' },
+ 'base': {
+ 'target': 'StatsTarget',
+ '*providers': [ 'StatsRequest' ] },
'discriminator': 'target',
'data': { 'vcpu': 'StatsVCPUFilter' } }
@@ -226,5 +241,5 @@
# Since: 7.1
##
{ 'command': 'query-stats-schemas',
- 'data': { },
+ 'data': { '*provider': 'StatsProvider' },
'returns': [ 'StatsSchema' ] }
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 08/10] hmp: add filtering of statistics by provider
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (6 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 07/10] qmp: add filtering of statistics by provider Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-06-08 12:06 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 09/10] qmp: add filtering of statistics by name Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 10/10] hmp: " Paolo Bonzini
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
Allow the user to request statistics for a single provider of interest.
Extracted from a patch by Mark Kanda.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hmp-commands-info.hx | 7 ++++---
monitor/hmp-cmds.c | 39 ++++++++++++++++++++++++++++++++-------
2 files changed, 36 insertions(+), 10 deletions(-)
diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index 28757768f7..a67040443b 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -897,9 +897,10 @@ ERST
{
.name = "stats",
- .args_type = "target:s",
- .params = "target",
- .help = "show statistics; target is either vm or vcpu",
+ .args_type = "target:s,provider:s?",
+ .params = "target [provider]",
+ .help = "show statistics for the given target (vm or vcpu); optionally filter by "
+ "provider",
.cmd = hmp_info_stats,
},
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index c501d1fa2b..a71887e54c 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -2300,6 +2300,7 @@ static StatsSchemaValueList *find_schema_value_list(
}
static void print_stats_results(Monitor *mon, StatsTarget target,
+ bool show_provider,
StatsResult *result,
StatsSchemaList *schema)
{
@@ -2314,8 +2315,10 @@ static void print_stats_results(Monitor *mon, StatsTarget target,
return;
}
- monitor_printf(mon, "provider: %s\n",
- StatsProvider_str(result->provider));
+ if (show_provider) {
+ monitor_printf(mon, "provider: %s\n",
+ StatsProvider_str(result->provider));
+ }
for (stats_list = result->stats; stats_list;
stats_list = stats_list->next,
@@ -2356,7 +2359,8 @@ static void print_stats_results(Monitor *mon, StatsTarget target,
}
/* Create the StatsFilter that is needed for an "info stats" invocation. */
-static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
+static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
+ StatsProvider provider)
{
StatsFilter *filter = g_malloc0(sizeof(*filter));
@@ -2378,12 +2382,25 @@ static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
default:
break;
}
+
+ if (provider == STATS_PROVIDER__MAX) {
+ return filter;
+ }
+
+ /* "info stats" can only query either one or all the providers. */
+ filter->has_providers = true;
+ filter->providers = g_new0(StatsRequestList, 1);
+ filter->providers->value = g_new0(StatsRequest, 1);
+ filter->providers->value->provider = provider;
return filter;
}
void hmp_info_stats(Monitor *mon, const QDict *qdict)
{
const char *target_str = qdict_get_str(qdict, "target");
+ const char *provider_str = qdict_get_try_str(qdict, "provider");
+
+ StatsProvider provider = STATS_PROVIDER__MAX;
StatsTarget target;
Error *err = NULL;
g_autoptr(StatsSchemaList) schema = NULL;
@@ -2396,19 +2413,27 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "invalid stats target %s\n", target_str);
goto exit_no_print;
}
+ if (provider_str) {
+ provider = qapi_enum_parse(&StatsProvider_lookup, provider_str, -1, &err);
+ if (err) {
+ monitor_printf(mon, "invalid stats provider %s\n", provider_str);
+ goto exit_no_print;
+ }
+ }
- schema = qmp_query_stats_schemas(false, STATS_PROVIDER__MAX, &err);
+ schema = qmp_query_stats_schemas(provider_str ? true : false,
+ provider, &err);
if (err) {
goto exit;
}
switch (target) {
case STATS_TARGET_VM:
- filter = stats_filter(target, -1);
+ filter = stats_filter(target, -1, provider);
break;
case STATS_TARGET_VCPU: {}
int cpu_index = monitor_get_cpu_index(mon);
- filter = stats_filter(target, cpu_index);
+ filter = stats_filter(target, cpu_index, provider);
break;
default:
abort();
@@ -2419,7 +2444,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
goto exit;
}
for (entry = stats; entry; entry = entry->next) {
- print_stats_results(mon, target, entry->value, schema);
+ print_stats_results(mon, target, provider_str == NULL, entry->value, schema);
}
exit:
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 09/10] qmp: add filtering of statistics by name
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (7 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 08/10] hmp: " Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-06-08 13:36 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 10/10] hmp: " Paolo Bonzini
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
Allow retrieving only a subset of statistics. This can be useful
for example in order to plot a subset of the statistics many times
a second.
KVM publishes ~40 statistics for each vCPU on x86; retrieving and
serializing all of them would be useless
Another use will be in HMP in the following patch; implementing the
filter in the backend is easy enough that it was deemed okay to make
this a public interface.
Example:
{ "execute": "query-stats",
"arguments": {
"target": "vcpu",
"vcpus": [ "/machine/unattached/device[2]",
"/machine/unattached/device[4]" ],
"providers": [
{ "provider": "kvm",
"names": [ "l1d_flush", "exits" ] } } }
{ "return": {
"vcpus": [
{ "path": "/machine/unattached/device[2]"
"providers": [
{ "provider": "kvm",
"stats": [ { "name": "l1d_flush", "value": 41213 },
{ "name": "exits", "value": 74291 } ] } ] },
{ "path": "/machine/unattached/device[4]"
"providers": [
{ "provider": "kvm",
"stats": [ { "name": "l1d_flush", "value": 16132 },
{ "name": "exits", "value": 57922 } ] } ] } ] } }
Extracted from a patch by Mark Kanda.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
accel/kvm/kvm-all.c | 17 +++++++++++------
include/monitor/stats.h | 2 +-
monitor/qmp-cmds.c | 7 ++++++-
qapi/stats.json | 6 +++++-
4 files changed, 23 insertions(+), 9 deletions(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 66c4ac1ac6..f90f0602bc 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2312,7 +2312,7 @@ bool kvm_dirty_ring_enabled(void)
}
static void query_stats_cb(StatsResultList **result, StatsTarget target,
- strList *targets, Error **errp);
+ strList *names, strList *targets, Error **errp);
static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp);
static int kvm_init(MachineState *ms)
@@ -3713,6 +3713,7 @@ typedef struct StatsArgs {
StatsResultList **stats;
StatsSchemaList **schema;
} result;
+ strList *names;
Error **errp;
} StatsArgs;
@@ -3921,7 +3922,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
}
static void query_stats(StatsResultList **result, StatsTarget target,
- int stats_fd, Error **errp)
+ strList *names, int stats_fd, Error **errp)
{
struct kvm_stats_desc *kvm_stats_desc;
struct kvm_stats_header *kvm_stats_header;
@@ -3963,6 +3964,9 @@ static void query_stats(StatsResultList **result, StatsTarget target,
/* Add entry to the list */
stats = (void *)stats_data + pdesc->offset;
+ if (!apply_str_list_filter(pdesc->name, names)) {
+ continue;
+ }
stats_list = add_kvmstat_entry(pdesc, stats, stats_list, errp);
}
@@ -4024,8 +4028,8 @@ static void query_stats_vcpu(CPUState *cpu, run_on_cpu_data data)
error_propagate(kvm_stats_args->errp, local_err);
return;
}
- query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, stats_fd,
- kvm_stats_args->errp);
+ query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU,
+ kvm_stats_args->names, stats_fd, kvm_stats_args->errp);
close(stats_fd);
}
@@ -4046,7 +4050,7 @@ static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data)
}
static void query_stats_cb(StatsResultList **result, StatsTarget target,
- strList *targets, Error **errp)
+ strList *names, strList *targets, Error **errp)
{
KVMState *s = kvm_state;
CPUState *cpu;
@@ -4060,7 +4064,7 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target,
error_setg_errno(errp, errno, "KVM errno, stats: ioctl failed");
return;
}
- query_stats(result, target, stats_fd, errp);
+ query_stats(result, target, names, stats_fd, errp);
close(stats_fd);
break;
}
@@ -4068,6 +4072,7 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target,
{
StatsArgs stats_args;
stats_args.result.stats = result;
+ stats_args.names = names;
stats_args.errp = errp;
CPU_FOREACH(cpu) {
if (!apply_str_list_filter(cpu->parent_obj.canonical_path, targets)) {
diff --git a/include/monitor/stats.h b/include/monitor/stats.h
index 80a523dd29..fcf0983154 100644
--- a/include/monitor/stats.h
+++ b/include/monitor/stats.h
@@ -11,7 +11,7 @@
#include "qapi/qapi-types-stats.h"
typedef void StatRetrieveFunc(StatsResultList **result, StatsTarget target,
- strList *targets, Error **errp);
+ strList *names, strList *targets, Error **errp);
typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
/*
diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
index e49ab345d7..7314cd813d 100644
--- a/monitor/qmp-cmds.c
+++ b/monitor/qmp-cmds.c
@@ -472,12 +472,17 @@ static bool invoke_stats_cb(StatsCallbacks *entry,
Error **errp)
{
strList *targets = NULL;
+ strList *names = NULL;
ERRP_GUARD();
if (request) {
if (request->provider != entry->provider) {
return true;
}
+ if (request->has_names && !request->names) {
+ return true;
+ }
+ names = request->has_names ? request->names : NULL;
}
switch (filter->target) {
@@ -496,7 +501,7 @@ static bool invoke_stats_cb(StatsCallbacks *entry,
abort();
}
- entry->stats_cb(stats_results, filter->target, targets, errp);
+ entry->stats_cb(stats_results, filter->target, names, targets, errp);
if (*errp) {
qapi_free_StatsResultList(*stats_results);
*stats_results = NULL;
diff --git a/qapi/stats.json b/qapi/stats.json
index 503918ea4c..2f8bfe8fdb 100644
--- a/qapi/stats.json
+++ b/qapi/stats.json
@@ -75,11 +75,14 @@
# Indicates a set of statistics that should be returned by query-stats.
#
# @provider: provider for which to return statistics.
+
+# @names: statistics to be returned (all if omitted).
#
# Since: 7.1
##
{ 'struct': 'StatsRequest',
- 'data': { 'provider': 'StatsProvider' } }
+ 'data': { 'provider': 'StatsProvider',
+ '*names': [ 'str' ] } }
##
# @StatsVCPUFilter:
@@ -99,6 +102,7 @@
# that target:
# - which vCPUs to request statistics for
# - which providers to request statistics from
+# - which named values to return within each provider
#
# Since: 7.1
##
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* [PATCH v5 10/10] hmp: add filtering of statistics by name
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
` (8 preceding siblings ...)
2022-05-30 15:07 ` [PATCH v5 09/10] qmp: add filtering of statistics by name Paolo Bonzini
@ 2022-05-30 15:07 ` Paolo Bonzini
2022-06-08 13:40 ` Dr. David Alan Gilbert
9 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-30 15:07 UTC (permalink / raw)
To: qemu-devel; +Cc: armbru, dgilbert
Allow the user to request only a specific subset of statistics.
This can be useful when working on a feature or optimization that is
known to affect that statistic.
Extracted from a patch by Mark Kanda.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
hmp-commands-info.hx | 8 ++++----
monitor/hmp-cmds.c | 35 ++++++++++++++++++++++++++---------
2 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
index a67040443b..3ffa24bd67 100644
--- a/hmp-commands-info.hx
+++ b/hmp-commands-info.hx
@@ -897,10 +897,10 @@ ERST
{
.name = "stats",
- .args_type = "target:s,provider:s?",
- .params = "target [provider]",
- .help = "show statistics for the given target (vm or vcpu); optionally filter by "
- "provider",
+ .args_type = "target:s,names:s?,provider:s?",
+ .params = "target [names] [provider]",
+ .help = "show statistics for the given target (vm or vcpu); optionally filter by"
+ "name (comma-separated list, or * for all) and provider",
.cmd = hmp_info_stats,
},
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index a71887e54c..8775f69ff1 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -2359,10 +2359,12 @@ static void print_stats_results(Monitor *mon, StatsTarget target,
}
/* Create the StatsFilter that is needed for an "info stats" invocation. */
-static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
- StatsProvider provider)
+static StatsFilter *stats_filter(StatsTarget target, const char *names,
+ int cpu_index, StatsProvider provider)
{
StatsFilter *filter = g_malloc0(sizeof(*filter));
+ StatsProvider provider_idx;
+ StatsRequestList *request_list = NULL;
filter->target = target;
switch (target) {
@@ -2383,15 +2385,29 @@ static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
break;
}
- if (provider == STATS_PROVIDER__MAX) {
+ if (!names && provider == STATS_PROVIDER__MAX) {
return filter;
}
- /* "info stats" can only query either one or all the providers. */
+ /*
+ * "info stats" can only query either one or all the providers. Querying
+ * by name, but not by provider, requires the creation of one filter per
+ * provider.
+ */
+ for (provider_idx = 0; provider_idx < STATS_PROVIDER__MAX; provider_idx++) {
+ if (provider == STATS_PROVIDER__MAX || provider == provider_idx) {
+ StatsRequest *request = g_new0(StatsRequest, 1);
+ request->provider = provider_idx;
+ if (names && !g_str_equal(names, "*")) {
+ request->has_names = true;
+ request->names = strList_from_comma_list(names);
+ }
+ QAPI_LIST_PREPEND(request_list, request);
+ }
+ }
+
filter->has_providers = true;
- filter->providers = g_new0(StatsRequestList, 1);
- filter->providers->value = g_new0(StatsRequest, 1);
- filter->providers->value->provider = provider;
+ filter->providers = request_list;
return filter;
}
@@ -2399,6 +2415,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
{
const char *target_str = qdict_get_str(qdict, "target");
const char *provider_str = qdict_get_try_str(qdict, "provider");
+ const char *names = qdict_get_try_str(qdict, "names");
StatsProvider provider = STATS_PROVIDER__MAX;
StatsTarget target;
@@ -2429,11 +2446,11 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
switch (target) {
case STATS_TARGET_VM:
- filter = stats_filter(target, -1, provider);
+ filter = stats_filter(target, names, -1, provider);
break;
case STATS_TARGET_VCPU: {}
int cpu_index = monitor_get_cpu_index(mon);
- filter = stats_filter(target, cpu_index, provider);
+ filter = stats_filter(target, names, cpu_index, provider);
break;
default:
abort();
--
2.36.1
^ permalink raw reply related [flat|nested] 28+ messages in thread
* Re: [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi"
2022-05-30 15:07 ` [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi" Paolo Bonzini
@ 2022-05-30 21:56 ` Philippe Mathieu-Daudé via
0 siblings, 0 replies; 28+ messages in thread
From: Philippe Mathieu-Daudé via @ 2022-05-30 21:56 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: armbru, dgilbert
On 30/5/22 17:07, Paolo Bonzini wrote:
> The correct abbreviations use a lowercase k, so adjust freq_to_str
> and size_to_str accordingly and add tests.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> tests/unit/test-cutils.c | 20 ++++++++++++++++++++
> util/cutils.c | 6 +++---
> 2 files changed, 23 insertions(+), 3 deletions(-)
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes
2022-05-30 15:07 ` [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes Paolo Bonzini
@ 2022-05-30 21:59 ` Philippe Mathieu-Daudé via
2022-05-31 10:28 ` Paolo Bonzini
0 siblings, 1 reply; 28+ messages in thread
From: Philippe Mathieu-Daudé via @ 2022-05-30 21:59 UTC (permalink / raw)
To: Paolo Bonzini, qemu-devel; +Cc: armbru, dgilbert
On 30/5/22 17:07, Paolo Bonzini wrote:
> Extract the knowledge of IEC and SI prefixes out of size_to_str and
> freq_to_str, so that it can be reused when printing statistics.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> include/qemu/cutils.h | 18 ++++++++++++++++++
> tests/unit/test-cutils.c | 32 ++++++++++++++++++++++++++++++++
> util/cutils.c | 34 +++++++++++++++++++++++++---------
> 3 files changed, 75 insertions(+), 9 deletions(-)
> diff --git a/util/cutils.c b/util/cutils.c
> index 19fb4d04f8..485e9b0cea 100644
> --- a/util/cutils.c
> +++ b/util/cutils.c
> @@ -872,6 +872,25 @@ int parse_debug_env(const char *name, int max, int initial)
> return debug;
> }
>
> +const char *si_prefix(unsigned int exp10)
> +{
> + static const char *prefixes[] = {
> + "a", "f", "p", "n", "u", "m", "", "k", "M", "G", "T", "P", "E"
> + };
> +
> + exp10 += 18;
> + assert(exp10 % 3 == 0 && exp10 / 3 < ARRAY_SIZE(prefixes));
Can we add parenthesis to ease code review?
> + return prefixes[exp10 / 3];
> +}
> +
> +const char *iec_binary_prefix(unsigned int exp2)
> +{
> + static const char *prefixes[] = { "", "ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
> +
> + assert(exp2 % 10 == 0 && exp2 / 10 < ARRAY_SIZE(prefixes));
Ditto.
> + return prefixes[exp2 / 10];
> +}
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes
2022-05-30 21:59 ` Philippe Mathieu-Daudé via
@ 2022-05-31 10:28 ` Paolo Bonzini
0 siblings, 0 replies; 28+ messages in thread
From: Paolo Bonzini @ 2022-05-31 10:28 UTC (permalink / raw)
To: Philippe Mathieu-Daudé, qemu-devel; +Cc: armbru, dgilbert
On 5/30/22 23:59, Philippe Mathieu-Daudé via wrote:
>>
>> + assert(exp10 % 3 == 0 && exp10 / 3 < ARRAY_SIZE(prefixes));
>
> Can we add parenthesis to ease code review?
I'm not sure where... I thought about using two asserts too, but
checking both % and / seems clear enough.
Paolo
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-05-30 15:07 ` [PATCH v5 02/10] kvm: Support for querying fd-based stats Paolo Bonzini
@ 2022-06-07 17:44 ` Dr. David Alan Gilbert
2022-06-08 14:13 ` Paolo Bonzini
0 siblings, 1 reply; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-07 17:44 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru, Mark Kanda
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> From: Mark Kanda <mark.kanda@oracle.com>
>
> Add support for querying fd-based KVM stats - as introduced by Linux kernel
> commit:
>
> cb082bfab59a ("KVM: stats: Add fd-based API to read binary stats data")
>
> This allows the user to analyze the behavior of the VM without access
> to debugfs.
>
> Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> accel/kvm/kvm-all.c | 397 ++++++++++++++++++++++++++++++++++++++++++++
> qapi/stats.json | 2 +-
> 2 files changed, 398 insertions(+), 1 deletion(-)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 32e177bd26..c027536419 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -47,6 +47,7 @@
> #include "kvm-cpus.h"
>
> #include "hw/boards.h"
> +#include "monitor/stats.h"
>
> /* This check must be after config-host.h is included */
> #ifdef CONFIG_EVENTFD
> @@ -2310,6 +2311,9 @@ bool kvm_dirty_ring_enabled(void)
> return kvm_state->kvm_dirty_ring_size ? true : false;
> }
>
> +static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp);
> +static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp);
> +
> static int kvm_init(MachineState *ms)
> {
> MachineClass *mc = MACHINE_GET_CLASS(ms);
> @@ -2638,6 +2642,10 @@ static int kvm_init(MachineState *ms)
> }
> }
>
> + if (kvm_check_extension(kvm_state, KVM_CAP_BINARY_STATS_FD)) {
> + add_stats_callbacks(query_stats_cb, query_stats_schemas_cb);
> + }
> +
> return 0;
>
> err:
> @@ -3697,3 +3705,392 @@ static void kvm_type_init(void)
> }
>
> type_init(kvm_type_init);
> +
> +typedef struct StatsArgs {
> + union StatsResultsType {
> + StatsResultList **stats;
> + StatsSchemaList **schema;
> + } result;
> + Error **errp;
> +} StatsArgs;
> +
> +static StatsList *add_kvmstat_entry(struct kvm_stats_desc *pdesc,
> + uint64_t *stats_data,
> + StatsList *stats_list,
> + Error **errp)
> +{
> +
> + Stats *stats;
> + uint64List *val_list = NULL;
> +
> + /* Only add stats that we understand. */
> + switch (pdesc->flags & KVM_STATS_TYPE_MASK) {
> + case KVM_STATS_TYPE_CUMULATIVE:
> + case KVM_STATS_TYPE_INSTANT:
> + case KVM_STATS_TYPE_PEAK:
> + case KVM_STATS_TYPE_LINEAR_HIST:
> + case KVM_STATS_TYPE_LOG_HIST:
> + break;
> + default:
> + return stats_list;
> + }
> +
> + switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> + case KVM_STATS_UNIT_NONE:
> + case KVM_STATS_UNIT_BYTES:
> + case KVM_STATS_UNIT_CYCLES:
> + case KVM_STATS_UNIT_SECONDS:
> + break;
> + default:
> + return stats_list;
> + }
> +
> + switch (pdesc->flags & KVM_STATS_BASE_MASK) {
> + case KVM_STATS_BASE_POW10:
> + case KVM_STATS_BASE_POW2:
> + break;
> + default:
> + return stats_list;
> + }
> +
> + /* Alloc and populate data list */
> + stats = g_new0(Stats, 1);
> + stats->name = g_strdup(pdesc->name);
> + stats->value = g_new0(StatsValue, 1);;
> +
> + if (pdesc->size == 1) {
> + stats->value->u.scalar = *stats_data;
> + stats->value->type = QTYPE_QNUM;
> + } else {
> + int i;
> + for (i = 0; i < pdesc->size; i++) {
> + QAPI_LIST_PREPEND(val_list, stats_data[i]);
> + }
> + stats->value->u.list = val_list;
> + stats->value->type = QTYPE_QLIST;
> + }
> +
> + QAPI_LIST_PREPEND(stats_list, stats);
> + return stats_list;
> +}
> +
> +static StatsSchemaValueList *add_kvmschema_entry(struct kvm_stats_desc *pdesc,
> + StatsSchemaValueList *list,
> + Error **errp)
> +{
> + StatsSchemaValueList *schema_entry = g_new0(StatsSchemaValueList, 1);
> + schema_entry->value = g_new0(StatsSchemaValue, 1);
> +
> + switch (pdesc->flags & KVM_STATS_TYPE_MASK) {
> + case KVM_STATS_TYPE_CUMULATIVE:
> + schema_entry->value->type = STATS_TYPE_CUMULATIVE;
> + break;
> + case KVM_STATS_TYPE_INSTANT:
> + schema_entry->value->type = STATS_TYPE_INSTANT;
> + break;
> + case KVM_STATS_TYPE_PEAK:
> + schema_entry->value->type = STATS_TYPE_PEAK;
> + break;
> + case KVM_STATS_TYPE_LINEAR_HIST:
> + schema_entry->value->type = STATS_TYPE_LINEAR_HISTOGRAM;
> + schema_entry->value->bucket_size = pdesc->bucket_size;
> + schema_entry->value->has_bucket_size = true;
> + break;
> + case KVM_STATS_TYPE_LOG_HIST:
> + schema_entry->value->type = STATS_TYPE_LOG2_HISTOGRAM;
> + break;
> + default:
> + goto exit;
> + }
> +
> + switch (pdesc->flags & KVM_STATS_UNIT_MASK) {
> + case KVM_STATS_UNIT_NONE:
> + break;
> + case KVM_STATS_UNIT_BYTES:
> + schema_entry->value->has_unit = true;
> + schema_entry->value->unit = STATS_UNIT_BYTES;
> + break;
> + case KVM_STATS_UNIT_CYCLES:
> + schema_entry->value->has_unit = true;
> + schema_entry->value->unit = STATS_UNIT_CYCLES;
> + break;
> + case KVM_STATS_UNIT_SECONDS:
> + schema_entry->value->has_unit = true;
> + schema_entry->value->unit = STATS_UNIT_SECONDS;
> + break;
> + default:
> + goto exit;
> + }
> +
> + schema_entry->value->exponent = pdesc->exponent;
> + if (pdesc->exponent) {
> + switch (pdesc->flags & KVM_STATS_BASE_MASK) {
> + case KVM_STATS_BASE_POW10:
> + schema_entry->value->has_base = true;
> + schema_entry->value->base = 10;
> + break;
> + case KVM_STATS_BASE_POW2:
> + schema_entry->value->has_base = true;
> + schema_entry->value->base = 2;
> + break;
> + default:
> + goto exit;
> + }
> + }
> +
> + schema_entry->value->name = g_strdup(pdesc->name);
> + schema_entry->next = list;
> + return schema_entry;
> +exit:
> + g_free(schema_entry->value);
> + g_free(schema_entry);
> + return list;
> +}
> +
> +/* Cached stats descriptors */
> +typedef struct StatsDescriptors {
> + char *ident; /* 'vm' or vCPU qom path */
> + struct kvm_stats_desc *kvm_stats_desc;
> + struct kvm_stats_header *kvm_stats_header;
> + QTAILQ_ENTRY(StatsDescriptors) next;
> +} StatsDescriptors;
> +
> +static QTAILQ_HEAD(, StatsDescriptors) stats_descriptors =
> + QTAILQ_HEAD_INITIALIZER(stats_descriptors);
> +
> +static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd,
> + Error **errp)
> +{
> + StatsDescriptors *descriptors;
> + const char *ident;
> + struct kvm_stats_desc *kvm_stats_desc;
> + struct kvm_stats_header *kvm_stats_header;
> + size_t size_desc;
> + ssize_t ret;
> +
> + switch (target) {
> + case STATS_TARGET_VM:
> + ident = StatsTarget_str(STATS_TARGET_VM);
> + break;
> + case STATS_TARGET_VCPU:
> + ident = current_cpu->parent_obj.canonical_path;
> + break;
> + default:
> + abort();
> + }
> +
> + QTAILQ_FOREACH(descriptors, &stats_descriptors, next) {
> + if (g_str_equal(descriptors->ident, ident)) {
> + return descriptors;
> + }
> + }
> +
> + descriptors = g_new0(StatsDescriptors, 1);
> +
> + /* Read stats header */
> + kvm_stats_header = g_malloc(sizeof(*kvm_stats_header));
> + ret = read(stats_fd, kvm_stats_header, sizeof(*kvm_stats_header));
> + if (ret != sizeof(*kvm_stats_header)) {
> + error_setg(errp, "KVM stats: failed to read stats header: "
> + "expected %zu actual %zu",
> + sizeof(*kvm_stats_header), ret);
> + return NULL;
> + }
> + size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
> +
> + /* Read stats descriptors */
> + kvm_stats_desc = g_malloc0_n(kvm_stats_header->num_desc, size_desc);
> + ret = pread(stats_fd, kvm_stats_desc,
> + size_desc * kvm_stats_header->num_desc,
> + kvm_stats_header->desc_offset);
> +
> + if (ret != size_desc * kvm_stats_header->num_desc) {
> + error_setg(errp, "KVM stats: failed to read stats descriptors: "
> + "expected %zu actual %zu",
> + size_desc * kvm_stats_header->num_desc, ret);
> + g_free(descriptors);
That's missing a free of kvm_stats_desc
(Sorry, I missed that last time)
> + return NULL;
> + }
> + descriptors->kvm_stats_header = kvm_stats_header;
> + descriptors->kvm_stats_desc = kvm_stats_desc;
> + descriptors->ident = g_strdup(ident);
There's something that confuses me here; you check your set of
descriptors above to find any with the matching ident, and if you've
already got it you return it; OK. Now, if you don't match then you
read some stats and store it with that ident - but I don't see
when you read the stats from the fd, what makes it read the stats that
correspond to 'ident' ?
> + QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next);
> + return descriptors;
> +}
> +
> +static void query_stats(StatsResultList **result, StatsTarget target,
> + int stats_fd, Error **errp)
> +{
> + struct kvm_stats_desc *kvm_stats_desc;
> + struct kvm_stats_header *kvm_stats_header;
> + StatsDescriptors *descriptors;
> + g_autofree uint64_t *stats_data = NULL;
> + struct kvm_stats_desc *pdesc;
> + StatsList *stats_list = NULL;
> + size_t size_desc, size_data = 0;
> + ssize_t ret;
> + int i;
> +
> + descriptors = find_stats_descriptors(target, stats_fd, errp);
> + if (!descriptors) {
> + return;
> + }
> +
> + kvm_stats_header = descriptors->kvm_stats_header;
> + kvm_stats_desc = descriptors->kvm_stats_desc;
> + size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
> +
> + /* Tally the total data size; read schema data */
> + for (i = 0; i < kvm_stats_header->num_desc; ++i) {
> + pdesc = (void *)kvm_stats_desc + i * size_desc;
> + size_data += pdesc->size * sizeof(*stats_data);
> + }
> +
> + stats_data = g_malloc0(size_data);
> + ret = pread(stats_fd, stats_data, size_data, kvm_stats_header->data_offset);
> +
> + if (ret != size_data) {
> + error_setg(errp, "KVM stats: failed to read data: "
> + "expected %zu actual %zu", size_data, ret);
> + return;
> + }
> +
> + for (i = 0; i < kvm_stats_header->num_desc; ++i) {
> + uint64_t *stats;
> + pdesc = (void *)kvm_stats_desc + i * size_desc;
> +
> + /* Add entry to the list */
> + stats = (void *)stats_data + pdesc->offset;
> + stats_list = add_kvmstat_entry(pdesc, stats, stats_list, errp);
> + }
> +
> + if (!stats_list) {
> + return;
> + }
> +
> + switch (target) {
> + case STATS_TARGET_VM:
> + add_stats_entry(result, STATS_PROVIDER_KVM, NULL, stats_list);
> + break;
> + case STATS_TARGET_VCPU:
> + add_stats_entry(result, STATS_PROVIDER_KVM,
> + current_cpu->parent_obj.canonical_path,
> + stats_list);
> + break;
> + default:
> + break;
> + }
> +}
> +
> +static void query_stats_schema(StatsSchemaList **result, StatsTarget target,
> + int stats_fd, Error **errp)
> +{
> + struct kvm_stats_desc *kvm_stats_desc;
> + struct kvm_stats_header *kvm_stats_header;
> + StatsDescriptors *descriptors;
> + struct kvm_stats_desc *pdesc;
> + StatsSchemaValueList *stats_list = NULL;
> + size_t size_desc;
> + int i;
> +
> + descriptors = find_stats_descriptors(target, stats_fd, errp);
> + if (!descriptors) {
> + return;
> + }
> +
> + kvm_stats_header = descriptors->kvm_stats_header;
> + kvm_stats_desc = descriptors->kvm_stats_desc;
> + size_desc = sizeof(*kvm_stats_desc) + kvm_stats_header->name_size;
> +
> + /* Tally the total data size; read schema data */
> + for (i = 0; i < kvm_stats_header->num_desc; ++i) {
> + pdesc = (void *)kvm_stats_desc + i * size_desc;
> + stats_list = add_kvmschema_entry(pdesc, stats_list, errp);
> + }
> +
> + add_stats_schema(result, STATS_PROVIDER_KVM, target, stats_list);
> +}
> +
> +static void query_stats_vcpu(CPUState *cpu, run_on_cpu_data data)
> +{
> + StatsArgs *kvm_stats_args = (StatsArgs *) data.host_ptr;
> + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
> + Error *local_err = NULL;
> +
> + if (stats_fd == -1) {
> + error_setg_errno(&local_err, errno, "KVM stats: ioctl failed");
> + error_propagate(kvm_stats_args->errp, local_err);
> + return;
> + }
> + query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, stats_fd,
> + kvm_stats_args->errp);
> + close(stats_fd);
> +}
> +
> +static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data)
> +{
> + StatsArgs *kvm_stats_args = (StatsArgs *) data.host_ptr;
> + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
> + Error *local_err = NULL;
> +
> + if (stats_fd == -1) {
> + error_setg_errno(&local_err, errno, "KVM stats: ioctl failed");
> + error_propagate(kvm_stats_args->errp, local_err);
> + return;
> + }
> + query_stats_schema(kvm_stats_args->result.schema, STATS_TARGET_VCPU, stats_fd,
> + kvm_stats_args->errp);
> + close(stats_fd);
> +}
> +
> +static void query_stats_cb(StatsResultList **result, StatsTarget target, Error **errp)
> +{
> + KVMState *s = kvm_state;
> + CPUState *cpu;
> + int stats_fd;
> +
> + switch (target) {
> + case STATS_TARGET_VM:
> + {
> + stats_fd = kvm_vm_ioctl(s, KVM_GET_STATS_FD, NULL);
> + if (stats_fd == -1) {
> + error_setg_errno(errp, errno, "KVM errno, stats: ioctl failed");
> + return;
> + }
> + query_stats(result, target, stats_fd, errp);
> + close(stats_fd);
> + break;
> + }
> + case STATS_TARGET_VCPU:
> + {
> + StatsArgs stats_args;
> + stats_args.result.stats = result;
> + stats_args.errp = errp;
> + CPU_FOREACH(cpu) {
> + run_on_cpu(cpu, query_stats_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args));
> + }
> + break;
> + }
> + default:
> + break;
> + }
> +}
> +
> +void query_stats_schemas_cb(StatsSchemaList **result, Error **errp)
> +{
> + StatsArgs stats_args;
> + KVMState *s = kvm_state;
> + int stats_fd;
> +
> + stats_fd = kvm_vm_ioctl(s, KVM_GET_STATS_FD, NULL);
> + if (stats_fd == -1) {
> + error_setg(errp, "KVM stats: ioctl failed");
missed an _errno
> + return;
> + }
> + query_stats_schema(result, STATS_TARGET_VM, stats_fd, errp);
> + close(stats_fd);
> +
> + stats_args.result.schema = result;
> + stats_args.errp = errp;
> + run_on_cpu(first_cpu, query_stats_schema_vcpu, RUN_ON_CPU_HOST_PTR(&stats_args));
> +}
> diff --git a/qapi/stats.json b/qapi/stats.json
> index ada0fbf26f..df7c4d886c 100644
> --- a/qapi/stats.json
> +++ b/qapi/stats.json
> @@ -52,7 +52,7 @@
> # Since: 7.1
> ##
> { 'enum': 'StatsProvider',
> - 'data': [ ] }
> + 'data': [ 'kvm' ] }
>
> ##
> # @StatsTarget:
> --
> 2.36.1
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 06/10] hmp: add basic "info stats" implementation
2022-05-30 15:07 ` [PATCH v5 06/10] hmp: add basic "info stats" implementation Paolo Bonzini
@ 2022-06-07 18:35 ` Dr. David Alan Gilbert
2022-06-08 14:27 ` Paolo Bonzini
0 siblings, 1 reply; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-07 18:35 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru, Mark Kanda
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> From: Mark Kanda <mark.kanda@oracle.com>
>
> Add an HMP command to retrieve statistics collected at run-time.
> The command will retrieve and print either all VM-level statistics,
> or all vCPU-level statistics for the currently selected CPU.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> hmp-commands-info.hx | 13 +++
> include/monitor/hmp.h | 1 +
> monitor/hmp-cmds.c | 190 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 204 insertions(+)
>
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index 834bed089e..28757768f7 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -894,3 +894,16 @@ SRST
> ``info via``
> Show guest mos6522 VIA devices.
> ERST
> +
> + {
> + .name = "stats",
> + .args_type = "target:s",
> + .params = "target",
> + .help = "show statistics; target is either vm or vcpu",
> + .cmd = hmp_info_stats,
> + },
> +
> +SRST
> + ``stats``
> + Show runtime-collected statistics
> +ERST
> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
> index 96d014826a..2e89a97bd6 100644
> --- a/include/monitor/hmp.h
> +++ b/include/monitor/hmp.h
> @@ -133,5 +133,6 @@ void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict);
> void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict);
> void hmp_human_readable_text_helper(Monitor *mon,
> HumanReadableText *(*qmp_handler)(Error **));
> +void hmp_info_stats(Monitor *mon, const QDict *qdict);
>
> #endif
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index 622c783c32..55b83c0a3a 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -40,6 +40,7 @@
> #include "qapi/qapi-commands-pci.h"
> #include "qapi/qapi-commands-rocker.h"
> #include "qapi/qapi-commands-run-state.h"
> +#include "qapi/qapi-commands-stats.h"
> #include "qapi/qapi-commands-tpm.h"
> #include "qapi/qapi-commands-ui.h"
> #include "qapi/qapi-visit-net.h"
> @@ -52,6 +53,7 @@
> #include "ui/console.h"
> #include "qemu/cutils.h"
> #include "qemu/error-report.h"
> +#include "hw/core/cpu.h"
> #include "hw/intc/intc.h"
> #include "migration/snapshot.h"
> #include "migration/misc.h"
> @@ -2239,3 +2241,191 @@ void hmp_info_memory_size_summary(Monitor *mon, const QDict *qdict)
> }
> hmp_handle_error(mon, err);
> }
> +
> +static void print_stats_schema_value(Monitor *mon, StatsSchemaValue *value)
> +{
> + const char *unit = NULL;
> + monitor_printf(mon, " %s (%s%s", value->name, StatsType_str(value->type),
> + value->has_unit || value->exponent ? ", " : "");
> +
> + if (value->has_unit) {
> + if (value->unit == STATS_UNIT_SECONDS) {
> + unit = "s";
> + } else if (value->unit == STATS_UNIT_BYTES) {
> + unit = "B";
> + }
> + }
> +
> + if (unit && value->base == 10 &&
> + value->exponent >= -9 && value->exponent <= 0 &&
> + value->exponent % 3 == 0) {
> + monitor_printf(mon, "%s", si_prefix(value->exponent));
> + } else if (unit && value->base == 2 &&
> + value->exponent >= 0 && value->exponent <= 40 &&
> + value->exponent % 10 == 0) {
> +
> + monitor_printf(mon, "%s", iec_binary_prefix(value->exponent));
OK that's better; but it's a shame the limits don't come from something
shared; iec_binary_prefix goes upto 60 and si_prefix goes way below -9
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> + } else if (value->exponent) {
> + /* Use exponential notation and write the unit's English name */
> + monitor_printf(mon, "* %d^%d%s",
> + value->base, value->exponent,
> + value->has_unit ? " " : "");
> + unit = NULL;
> + }
> +
> + if (value->has_unit) {
> + monitor_printf(mon, "%s", unit ? unit : StatsUnit_str(value->unit));
> + }
> +
> + /* Print bucket size for linear histograms */
> + if (value->type == STATS_TYPE_LINEAR_HISTOGRAM && value->has_bucket_size) {
> + monitor_printf(mon, ", bucket size=%d", value->bucket_size);
> + }
> + monitor_printf(mon, ")");
> +}
> +
> +static StatsSchemaValueList *find_schema_value_list(
> + StatsSchemaList *list, StatsProvider provider,
> + StatsTarget target)
> +{
> + StatsSchemaList *node;
> +
> + for (node = list; node; node = node->next) {
> + if (node->value->provider == provider &&
> + node->value->target == target) {
> + return node->value->stats;
> + }
> + }
> + return NULL;
> +}
> +
> +static void print_stats_results(Monitor *mon, StatsTarget target,
> + StatsResult *result,
> + StatsSchemaList *schema)
> +{
> + /* Find provider schema */
> + StatsSchemaValueList *schema_value_list =
> + find_schema_value_list(schema, result->provider, target);
> + StatsList *stats_list;
> +
> + if (!schema_value_list) {
> + monitor_printf(mon, "failed to find schema list for %s\n",
> + StatsProvider_str(result->provider));
> + return;
> + }
> +
> + monitor_printf(mon, "provider: %s\n",
> + StatsProvider_str(result->provider));
> +
> + for (stats_list = result->stats; stats_list;
> + stats_list = stats_list->next,
> + schema_value_list = schema_value_list->next) {
> +
> + Stats *stats = stats_list->value;
> + StatsValue *stats_value = stats->value;
> + StatsSchemaValue *schema_value = schema_value_list->value;
> +
> + /* Find schema entry */
> + while (!g_str_equal(stats->name, schema_value->name)) {
> + if (!schema_value_list->next) {
> + monitor_printf(mon, "failed to find schema entry for %s\n",
> + stats->name);
> + return;
> + }
> + schema_value_list = schema_value_list->next;
> + schema_value = schema_value_list->value;
> + }
> +
> + print_stats_schema_value(mon, schema_value);
> +
> + if (stats_value->type == QTYPE_QNUM) {
> + monitor_printf(mon, ": %" PRId64 "\n", stats_value->u.scalar);
> + } else if (stats_value->type == QTYPE_QLIST) {
> + uint64List *list;
> + int i;
> +
> + monitor_printf(mon, ": ");
> + for (list = stats_value->u.list, i = 1;
> + list;
> + list = list->next, i++) {
> + monitor_printf(mon, "[%d]=%" PRId64 " ", i, list->value);
> + }
> + monitor_printf(mon, "\n");
> + }
> + }
> +}
> +
> +/* Create the StatsFilter that is needed for an "info stats" invocation. */
> +static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
> +{
> + StatsFilter *filter = g_malloc0(sizeof(*filter));
> +
> + filter->target = target;
> + switch (target) {
> + case STATS_TARGET_VM:
> + break;
> + case STATS_TARGET_VCPU:
> + {
> + strList *vcpu_list = NULL;
> + CPUState *cpu = qemu_get_cpu(cpu_index);
> + char *canonical_path = object_get_canonical_path(OBJECT(cpu));
> +
> + QAPI_LIST_PREPEND(vcpu_list, canonical_path);
> + filter->u.vcpu.has_vcpus = true;
> + filter->u.vcpu.vcpus = vcpu_list;
> + break;
> + }
> + default:
> + break;
> + }
> + return filter;
> +}
> +
> +void hmp_info_stats(Monitor *mon, const QDict *qdict)
> +{
> + const char *target_str = qdict_get_str(qdict, "target");
> + StatsTarget target;
> + Error *err = NULL;
> + g_autoptr(StatsSchemaList) schema = NULL;
> + g_autoptr(StatsResultList) stats = NULL;
> + g_autoptr(StatsFilter) filter = NULL;
> + StatsResultList *entry;
> +
> + target = qapi_enum_parse(&StatsTarget_lookup, target_str, -1, &err);
> + if (err) {
> + monitor_printf(mon, "invalid stats target %s\n", target_str);
> + goto exit_no_print;
> + }
> +
> + schema = qmp_query_stats_schemas(&err);
> + if (err) {
> + goto exit;
> + }
> +
> + switch (target) {
> + case STATS_TARGET_VM:
> + filter = stats_filter(target, -1);
> + break;
> + case STATS_TARGET_VCPU: {}
> + int cpu_index = monitor_get_cpu_index(mon);
> + filter = stats_filter(target, cpu_index);
> + break;
> + default:
> + abort();
> + }
> +
> + stats = qmp_query_stats(filter, &err);
> + if (err) {
> + goto exit;
> + }
> + for (entry = stats; entry; entry = entry->next) {
> + print_stats_results(mon, target, entry->value, schema);
> + }
> +
> +exit:
> + if (err) {
> + monitor_printf(mon, "%s\n", error_get_pretty(err));
> + }
> +exit_no_print:
> + error_free(err);
> +}
> --
> 2.36.1
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 07/10] qmp: add filtering of statistics by provider
2022-05-30 15:07 ` [PATCH v5 07/10] qmp: add filtering of statistics by provider Paolo Bonzini
@ 2022-06-08 11:52 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 11:52 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> Allow retrieving the statistics from a specific provider only.
> This can be used in the future by HMP commands such as "info
> sync-profile" or "info profile". The next patch also adds
> filter-by-provider capabilities to the HMP equivalent of
> query-stats, "info stats".
>
> Example:
>
> { "execute": "query-stats",
> "arguments": {
> "target": "vm",
> "providers": [
> { "provider": "kvm" } ] } }
>
> The QAPI is a bit more verbose than just a list of StatsProvider,
> so that it can be subsequently extended with filtering of statistics
> by name.
>
> If a provider is specified more than once in the filter, each request
> will be included separately in the output.
>
> Extracted from a patch by Mark Kanda.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
> Here I removed the Reviewed-by because the effect of the new
> implementation is especially marekd when you have multiple filters.
> Before, all filters were evaluated first, and the callback was then
> run if there was a match. Now, each filter is evaluated separately.
>
> accel/kvm/kvm-all.c | 3 ++-
> include/monitor/stats.h | 4 +++-
> monitor/hmp-cmds.c | 2 +-
> monitor/qmp-cmds.c | 41 ++++++++++++++++++++++++++++++++---------
> qapi/stats.json | 19 +++++++++++++++++--
> 5 files changed, 55 insertions(+), 14 deletions(-)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index d75fb3d95c..66c4ac1ac6 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -2644,7 +2644,8 @@ static int kvm_init(MachineState *ms)
> }
>
> if (kvm_check_extension(kvm_state, KVM_CAP_BINARY_STATS_FD)) {
> - add_stats_callbacks(query_stats_cb, query_stats_schemas_cb);
> + add_stats_callbacks(STATS_PROVIDER_KVM, query_stats_cb,
> + query_stats_schemas_cb);
> }
>
> return 0;
> diff --git a/include/monitor/stats.h b/include/monitor/stats.h
> index 8c50feeaa9..80a523dd29 100644
> --- a/include/monitor/stats.h
> +++ b/include/monitor/stats.h
> @@ -17,10 +17,12 @@ typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
> /*
> * Register callbacks for the QMP query-stats command.
> *
> + * @provider: stats provider checked against QMP command arguments
> * @stats_fn: routine to query stats:
> * @schema_fn: routine to query stat schemas:
> */
> -void add_stats_callbacks(StatRetrieveFunc *stats_fn,
> +void add_stats_callbacks(StatsProvider provider,
> + StatRetrieveFunc *stats_fn,
> SchemaRetrieveFunc *schemas_fn);
>
> /*
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index 55b83c0a3a..c501d1fa2b 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -2397,7 +2397,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
> goto exit_no_print;
> }
>
> - schema = qmp_query_stats_schemas(&err);
> + schema = qmp_query_stats_schemas(false, STATS_PROVIDER__MAX, &err);
> if (err) {
> goto exit;
> }
> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> index 5f8f1e620b..e49ab345d7 100644
> --- a/monitor/qmp-cmds.c
> +++ b/monitor/qmp-cmds.c
> @@ -445,6 +445,7 @@ HumanReadableText *qmp_x_query_irq(Error **errp)
> }
>
> typedef struct StatsCallbacks {
> + StatsProvider provider;
> StatRetrieveFunc *stats_cb;
> SchemaRetrieveFunc *schemas_cb;
> QTAILQ_ENTRY(StatsCallbacks) next;
> @@ -453,10 +454,12 @@ typedef struct StatsCallbacks {
> static QTAILQ_HEAD(, StatsCallbacks) stats_callbacks =
> QTAILQ_HEAD_INITIALIZER(stats_callbacks);
>
> -void add_stats_callbacks(StatRetrieveFunc *stats_fn,
> +void add_stats_callbacks(StatsProvider provider,
> + StatRetrieveFunc *stats_fn,
> SchemaRetrieveFunc *schemas_fn)
> {
> StatsCallbacks *entry = g_new(StatsCallbacks, 1);
> + entry->provider = provider;
> entry->stats_cb = stats_fn;
> entry->schemas_cb = schemas_fn;
>
> @@ -465,12 +468,18 @@ void add_stats_callbacks(StatRetrieveFunc *stats_fn,
>
> static bool invoke_stats_cb(StatsCallbacks *entry,
> StatsResultList **stats_results,
> - StatsFilter *filter,
> + StatsFilter *filter, StatsRequest *request,
> Error **errp)
> {
> strList *targets = NULL;
> ERRP_GUARD();
>
> + if (request) {
> + if (request->provider != entry->provider) {
> + return true;
> + }
> + }
> +
> switch (filter->target) {
> case STATS_TARGET_VM:
> break;
> @@ -500,27 +509,41 @@ StatsResultList *qmp_query_stats(StatsFilter *filter, Error **errp)
> {
> StatsResultList *stats_results = NULL;
> StatsCallbacks *entry;
> + StatsRequestList *request;
>
> QTAILQ_FOREACH(entry, &stats_callbacks, next) {
> - if (!invoke_stats_cb(entry, &stats_results, filter, errp)) {
> - break;
> + if (filter->has_providers) {
> + for (request = filter->providers; request; request = request->next) {
> + if (!invoke_stats_cb(entry, &stats_results, filter,
> + request->value, errp)) {
> + break;
> + }
> + }
> + } else {
> + if (!invoke_stats_cb(entry, &stats_results, filter, NULL, errp)) {
> + break;
> + }
> }
> }
>
> return stats_results;
> }
>
> -StatsSchemaList *qmp_query_stats_schemas(Error **errp)
> +StatsSchemaList *qmp_query_stats_schemas(bool has_provider,
> + StatsProvider provider,
> + Error **errp)
> {
> StatsSchemaList *stats_results = NULL;
> StatsCallbacks *entry;
> ERRP_GUARD();
>
> QTAILQ_FOREACH(entry, &stats_callbacks, next) {
> - entry->schemas_cb(&stats_results, errp);
> - if (*errp) {
> - qapi_free_StatsSchemaList(stats_results);
> - return NULL;
> + if (!has_provider || provider == entry->provider) {
> + entry->schemas_cb(&stats_results, errp);
> + if (*errp) {
> + qapi_free_StatsSchemaList(stats_results);
> + return NULL;
> + }
> }
> }
>
> diff --git a/qapi/stats.json b/qapi/stats.json
> index 8c9abb57f1..503918ea4c 100644
> --- a/qapi/stats.json
> +++ b/qapi/stats.json
> @@ -69,6 +69,18 @@
> { 'enum': 'StatsTarget',
> 'data': [ 'vm', 'vcpu' ] }
>
> +##
> +# @StatsRequest:
> +#
> +# Indicates a set of statistics that should be returned by query-stats.
> +#
> +# @provider: provider for which to return statistics.
> +#
> +# Since: 7.1
> +##
> +{ 'struct': 'StatsRequest',
> + 'data': { 'provider': 'StatsProvider' } }
> +
> ##
> # @StatsVCPUFilter:
> #
> @@ -86,11 +98,14 @@
> # request statistics and optionally the required subset of information for
> # that target:
> # - which vCPUs to request statistics for
> +# - which providers to request statistics from
> #
> # Since: 7.1
> ##
> { 'union': 'StatsFilter',
> - 'base': { 'target': 'StatsTarget' },
> + 'base': {
> + 'target': 'StatsTarget',
> + '*providers': [ 'StatsRequest' ] },
> 'discriminator': 'target',
> 'data': { 'vcpu': 'StatsVCPUFilter' } }
>
> @@ -226,5 +241,5 @@
> # Since: 7.1
> ##
> { 'command': 'query-stats-schemas',
> - 'data': { },
> + 'data': { '*provider': 'StatsProvider' },
> 'returns': [ 'StatsSchema' ] }
> --
> 2.36.1
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 08/10] hmp: add filtering of statistics by provider
2022-05-30 15:07 ` [PATCH v5 08/10] hmp: " Paolo Bonzini
@ 2022-06-08 12:06 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 12:06 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> Allow the user to request statistics for a single provider of interest.
> Extracted from a patch by Mark Kanda.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
> hmp-commands-info.hx | 7 ++++---
> monitor/hmp-cmds.c | 39 ++++++++++++++++++++++++++++++++-------
> 2 files changed, 36 insertions(+), 10 deletions(-)
>
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index 28757768f7..a67040443b 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -897,9 +897,10 @@ ERST
>
> {
> .name = "stats",
> - .args_type = "target:s",
> - .params = "target",
> - .help = "show statistics; target is either vm or vcpu",
> + .args_type = "target:s,provider:s?",
> + .params = "target [provider]",
> + .help = "show statistics for the given target (vm or vcpu); optionally filter by "
> + "provider",
> .cmd = hmp_info_stats,
> },
>
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index c501d1fa2b..a71887e54c 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -2300,6 +2300,7 @@ static StatsSchemaValueList *find_schema_value_list(
> }
>
> static void print_stats_results(Monitor *mon, StatsTarget target,
> + bool show_provider,
> StatsResult *result,
> StatsSchemaList *schema)
> {
> @@ -2314,8 +2315,10 @@ static void print_stats_results(Monitor *mon, StatsTarget target,
> return;
> }
>
> - monitor_printf(mon, "provider: %s\n",
> - StatsProvider_str(result->provider));
> + if (show_provider) {
> + monitor_printf(mon, "provider: %s\n",
> + StatsProvider_str(result->provider));
> + }
>
> for (stats_list = result->stats; stats_list;
> stats_list = stats_list->next,
> @@ -2356,7 +2359,8 @@ static void print_stats_results(Monitor *mon, StatsTarget target,
> }
>
> /* Create the StatsFilter that is needed for an "info stats" invocation. */
> -static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
> +static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
> + StatsProvider provider)
> {
> StatsFilter *filter = g_malloc0(sizeof(*filter));
>
> @@ -2378,12 +2382,25 @@ static StatsFilter *stats_filter(StatsTarget target, int cpu_index)
> default:
> break;
> }
> +
> + if (provider == STATS_PROVIDER__MAX) {
> + return filter;
> + }
> +
> + /* "info stats" can only query either one or all the providers. */
> + filter->has_providers = true;
> + filter->providers = g_new0(StatsRequestList, 1);
> + filter->providers->value = g_new0(StatsRequest, 1);
> + filter->providers->value->provider = provider;
> return filter;
> }
>
> void hmp_info_stats(Monitor *mon, const QDict *qdict)
> {
> const char *target_str = qdict_get_str(qdict, "target");
> + const char *provider_str = qdict_get_try_str(qdict, "provider");
> +
> + StatsProvider provider = STATS_PROVIDER__MAX;
> StatsTarget target;
> Error *err = NULL;
> g_autoptr(StatsSchemaList) schema = NULL;
> @@ -2396,19 +2413,27 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
> monitor_printf(mon, "invalid stats target %s\n", target_str);
> goto exit_no_print;
> }
> + if (provider_str) {
> + provider = qapi_enum_parse(&StatsProvider_lookup, provider_str, -1, &err);
> + if (err) {
> + monitor_printf(mon, "invalid stats provider %s\n", provider_str);
> + goto exit_no_print;
> + }
> + }
>
> - schema = qmp_query_stats_schemas(false, STATS_PROVIDER__MAX, &err);
> + schema = qmp_query_stats_schemas(provider_str ? true : false,
> + provider, &err);
> if (err) {
> goto exit;
> }
>
> switch (target) {
> case STATS_TARGET_VM:
> - filter = stats_filter(target, -1);
> + filter = stats_filter(target, -1, provider);
> break;
> case STATS_TARGET_VCPU: {}
> int cpu_index = monitor_get_cpu_index(mon);
> - filter = stats_filter(target, cpu_index);
> + filter = stats_filter(target, cpu_index, provider);
> break;
> default:
> abort();
> @@ -2419,7 +2444,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
> goto exit;
> }
> for (entry = stats; entry; entry = entry->next) {
> - print_stats_results(mon, target, entry->value, schema);
> + print_stats_results(mon, target, provider_str == NULL, entry->value, schema);
> }
>
> exit:
> --
> 2.36.1
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 09/10] qmp: add filtering of statistics by name
2022-05-30 15:07 ` [PATCH v5 09/10] qmp: add filtering of statistics by name Paolo Bonzini
@ 2022-06-08 13:36 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 13:36 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> Allow retrieving only a subset of statistics. This can be useful
> for example in order to plot a subset of the statistics many times
> a second.
>
> KVM publishes ~40 statistics for each vCPU on x86; retrieving and
> serializing all of them would be useless
>
> Another use will be in HMP in the following patch; implementing the
> filter in the backend is easy enough that it was deemed okay to make
> this a public interface.
>
> Example:
>
> { "execute": "query-stats",
> "arguments": {
> "target": "vcpu",
> "vcpus": [ "/machine/unattached/device[2]",
> "/machine/unattached/device[4]" ],
> "providers": [
> { "provider": "kvm",
> "names": [ "l1d_flush", "exits" ] } } }
>
> { "return": {
> "vcpus": [
> { "path": "/machine/unattached/device[2]"
> "providers": [
> { "provider": "kvm",
> "stats": [ { "name": "l1d_flush", "value": 41213 },
> { "name": "exits", "value": 74291 } ] } ] },
> { "path": "/machine/unattached/device[4]"
> "providers": [
> { "provider": "kvm",
> "stats": [ { "name": "l1d_flush", "value": 16132 },
> { "name": "exits", "value": 57922 } ] } ] } ] } }
>
> Extracted from a patch by Mark Kanda.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
> accel/kvm/kvm-all.c | 17 +++++++++++------
> include/monitor/stats.h | 2 +-
> monitor/qmp-cmds.c | 7 ++++++-
> qapi/stats.json | 6 +++++-
> 4 files changed, 23 insertions(+), 9 deletions(-)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 66c4ac1ac6..f90f0602bc 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -2312,7 +2312,7 @@ bool kvm_dirty_ring_enabled(void)
> }
>
> static void query_stats_cb(StatsResultList **result, StatsTarget target,
> - strList *targets, Error **errp);
> + strList *names, strList *targets, Error **errp);
> static void query_stats_schemas_cb(StatsSchemaList **result, Error **errp);
>
> static int kvm_init(MachineState *ms)
> @@ -3713,6 +3713,7 @@ typedef struct StatsArgs {
> StatsResultList **stats;
> StatsSchemaList **schema;
> } result;
> + strList *names;
> Error **errp;
> } StatsArgs;
>
> @@ -3921,7 +3922,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
> }
>
> static void query_stats(StatsResultList **result, StatsTarget target,
> - int stats_fd, Error **errp)
> + strList *names, int stats_fd, Error **errp)
> {
> struct kvm_stats_desc *kvm_stats_desc;
> struct kvm_stats_header *kvm_stats_header;
> @@ -3963,6 +3964,9 @@ static void query_stats(StatsResultList **result, StatsTarget target,
>
> /* Add entry to the list */
> stats = (void *)stats_data + pdesc->offset;
> + if (!apply_str_list_filter(pdesc->name, names)) {
> + continue;
> + }
> stats_list = add_kvmstat_entry(pdesc, stats, stats_list, errp);
> }
>
> @@ -4024,8 +4028,8 @@ static void query_stats_vcpu(CPUState *cpu, run_on_cpu_data data)
> error_propagate(kvm_stats_args->errp, local_err);
> return;
> }
> - query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU, stats_fd,
> - kvm_stats_args->errp);
> + query_stats(kvm_stats_args->result.stats, STATS_TARGET_VCPU,
> + kvm_stats_args->names, stats_fd, kvm_stats_args->errp);
> close(stats_fd);
> }
>
> @@ -4046,7 +4050,7 @@ static void query_stats_schema_vcpu(CPUState *cpu, run_on_cpu_data data)
> }
>
> static void query_stats_cb(StatsResultList **result, StatsTarget target,
> - strList *targets, Error **errp)
> + strList *names, strList *targets, Error **errp)
> {
> KVMState *s = kvm_state;
> CPUState *cpu;
> @@ -4060,7 +4064,7 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target,
> error_setg_errno(errp, errno, "KVM errno, stats: ioctl failed");
> return;
> }
> - query_stats(result, target, stats_fd, errp);
> + query_stats(result, target, names, stats_fd, errp);
> close(stats_fd);
> break;
> }
> @@ -4068,6 +4072,7 @@ static void query_stats_cb(StatsResultList **result, StatsTarget target,
> {
> StatsArgs stats_args;
> stats_args.result.stats = result;
> + stats_args.names = names;
> stats_args.errp = errp;
> CPU_FOREACH(cpu) {
> if (!apply_str_list_filter(cpu->parent_obj.canonical_path, targets)) {
> diff --git a/include/monitor/stats.h b/include/monitor/stats.h
> index 80a523dd29..fcf0983154 100644
> --- a/include/monitor/stats.h
> +++ b/include/monitor/stats.h
> @@ -11,7 +11,7 @@
> #include "qapi/qapi-types-stats.h"
>
> typedef void StatRetrieveFunc(StatsResultList **result, StatsTarget target,
> - strList *targets, Error **errp);
> + strList *names, strList *targets, Error **errp);
> typedef void SchemaRetrieveFunc(StatsSchemaList **result, Error **errp);
>
> /*
> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> index e49ab345d7..7314cd813d 100644
> --- a/monitor/qmp-cmds.c
> +++ b/monitor/qmp-cmds.c
> @@ -472,12 +472,17 @@ static bool invoke_stats_cb(StatsCallbacks *entry,
> Error **errp)
> {
> strList *targets = NULL;
> + strList *names = NULL;
> ERRP_GUARD();
>
> if (request) {
> if (request->provider != entry->provider) {
> return true;
> }
> + if (request->has_names && !request->names) {
> + return true;
> + }
> + names = request->has_names ? request->names : NULL;
> }
>
> switch (filter->target) {
> @@ -496,7 +501,7 @@ static bool invoke_stats_cb(StatsCallbacks *entry,
> abort();
> }
>
> - entry->stats_cb(stats_results, filter->target, targets, errp);
> + entry->stats_cb(stats_results, filter->target, names, targets, errp);
> if (*errp) {
> qapi_free_StatsResultList(*stats_results);
> *stats_results = NULL;
> diff --git a/qapi/stats.json b/qapi/stats.json
> index 503918ea4c..2f8bfe8fdb 100644
> --- a/qapi/stats.json
> +++ b/qapi/stats.json
> @@ -75,11 +75,14 @@
> # Indicates a set of statistics that should be returned by query-stats.
> #
> # @provider: provider for which to return statistics.
> +
> +# @names: statistics to be returned (all if omitted).
> #
> # Since: 7.1
> ##
> { 'struct': 'StatsRequest',
> - 'data': { 'provider': 'StatsProvider' } }
> + 'data': { 'provider': 'StatsProvider',
> + '*names': [ 'str' ] } }
>
> ##
> # @StatsVCPUFilter:
> @@ -99,6 +102,7 @@
> # that target:
> # - which vCPUs to request statistics for
> # - which providers to request statistics from
> +# - which named values to return within each provider
> #
> # Since: 7.1
> ##
> --
> 2.36.1
>
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 10/10] hmp: add filtering of statistics by name
2022-05-30 15:07 ` [PATCH v5 10/10] hmp: " Paolo Bonzini
@ 2022-06-08 13:40 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 13:40 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> Allow the user to request only a specific subset of statistics.
> This can be useful when working on a feature or optimization that is
> known to affect that statistic.
>
> Extracted from a patch by Mark Kanda.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
I think that's OK, if you repost please fix up the commit message with
examples of the command with and without names.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Dave
> ---
> hmp-commands-info.hx | 8 ++++----
> monitor/hmp-cmds.c | 35 ++++++++++++++++++++++++++---------
> 2 files changed, 30 insertions(+), 13 deletions(-)
>
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index a67040443b..3ffa24bd67 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -897,10 +897,10 @@ ERST
>
> {
> .name = "stats",
> - .args_type = "target:s,provider:s?",
> - .params = "target [provider]",
> - .help = "show statistics for the given target (vm or vcpu); optionally filter by "
> - "provider",
> + .args_type = "target:s,names:s?,provider:s?",
> + .params = "target [names] [provider]",
> + .help = "show statistics for the given target (vm or vcpu); optionally filter by"
> + "name (comma-separated list, or * for all) and provider",
> .cmd = hmp_info_stats,
> },
>
> diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
> index a71887e54c..8775f69ff1 100644
> --- a/monitor/hmp-cmds.c
> +++ b/monitor/hmp-cmds.c
> @@ -2359,10 +2359,12 @@ static void print_stats_results(Monitor *mon, StatsTarget target,
> }
>
> /* Create the StatsFilter that is needed for an "info stats" invocation. */
> -static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
> - StatsProvider provider)
> +static StatsFilter *stats_filter(StatsTarget target, const char *names,
> + int cpu_index, StatsProvider provider)
> {
> StatsFilter *filter = g_malloc0(sizeof(*filter));
> + StatsProvider provider_idx;
> + StatsRequestList *request_list = NULL;
>
> filter->target = target;
> switch (target) {
> @@ -2383,15 +2385,29 @@ static StatsFilter *stats_filter(StatsTarget target, int cpu_index,
> break;
> }
>
> - if (provider == STATS_PROVIDER__MAX) {
> + if (!names && provider == STATS_PROVIDER__MAX) {
> return filter;
> }
>
> - /* "info stats" can only query either one or all the providers. */
> + /*
> + * "info stats" can only query either one or all the providers. Querying
> + * by name, but not by provider, requires the creation of one filter per
> + * provider.
> + */
> + for (provider_idx = 0; provider_idx < STATS_PROVIDER__MAX; provider_idx++) {
> + if (provider == STATS_PROVIDER__MAX || provider == provider_idx) {
> + StatsRequest *request = g_new0(StatsRequest, 1);
> + request->provider = provider_idx;
> + if (names && !g_str_equal(names, "*")) {
> + request->has_names = true;
> + request->names = strList_from_comma_list(names);
> + }
> + QAPI_LIST_PREPEND(request_list, request);
> + }
> + }
> +
> filter->has_providers = true;
> - filter->providers = g_new0(StatsRequestList, 1);
> - filter->providers->value = g_new0(StatsRequest, 1);
> - filter->providers->value->provider = provider;
> + filter->providers = request_list;
> return filter;
> }
>
> @@ -2399,6 +2415,7 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
> {
> const char *target_str = qdict_get_str(qdict, "target");
> const char *provider_str = qdict_get_try_str(qdict, "provider");
> + const char *names = qdict_get_try_str(qdict, "names");
>
> StatsProvider provider = STATS_PROVIDER__MAX;
> StatsTarget target;
> @@ -2429,11 +2446,11 @@ void hmp_info_stats(Monitor *mon, const QDict *qdict)
>
> switch (target) {
> case STATS_TARGET_VM:
> - filter = stats_filter(target, -1, provider);
> + filter = stats_filter(target, names, -1, provider);
> break;
> case STATS_TARGET_VCPU: {}
> int cpu_index = monitor_get_cpu_index(mon);
> - filter = stats_filter(target, cpu_index, provider);
> + filter = stats_filter(target, names, cpu_index, provider);
> break;
> default:
> abort();
> --
> 2.36.1
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-06-07 17:44 ` Dr. David Alan Gilbert
@ 2022-06-08 14:13 ` Paolo Bonzini
2022-06-08 14:52 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-06-08 14:13 UTC (permalink / raw)
To: Dr. David Alan Gilbert; +Cc: qemu-devel, armbru, Mark Kanda
On 6/7/22 19:44, Dr. David Alan Gilbert wrote:
>> + return NULL;
>> + }
>> + descriptors->kvm_stats_header = kvm_stats_header;
>> + descriptors->kvm_stats_desc = kvm_stats_desc;
>> + descriptors->ident = g_strdup(ident);
>
> There's something that confuses me here; you check your set of
> descriptors above to find any with the matching ident, and if you've
> already got it you return it; OK. Now, if you don't match then you
> read some stats and store it with that ident - but I don't see
> when you read the stats from the fd, what makes it read the stats that
> correspond to 'ident' ?
If you mean why not some other source, each source has a different file
descriptor:
+ int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
but the descriptors are consistent every time KVM_GET_STATS_FD is
called, so basically "ident" can be used as a cache key.
If you mean how does it access the right stat, here it uses the offset
field in the descriptor
ret = pread(stats_fd, stats_data, size_data,
kvm_stats_header->data_offset);
...
for (i = 0; i < kvm_stats_header->num_desc; ++i) {
uint64_t *stats;
pdesc = (void *)kvm_stats_desc + i * size_desc;
/* Add entry to the list */
stats = (void *)stats_data + pdesc->offset;
Paolo
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 06/10] hmp: add basic "info stats" implementation
2022-06-07 18:35 ` Dr. David Alan Gilbert
@ 2022-06-08 14:27 ` Paolo Bonzini
2022-06-08 15:23 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-06-08 14:27 UTC (permalink / raw)
To: Dr. David Alan Gilbert; +Cc: qemu-devel, armbru, Mark Kanda
On 6/7/22 20:35, Dr. David Alan Gilbert wrote:
>> + monitor_printf(mon, "%s", iec_binary_prefix(value->exponent));
> OK that's better; but it's a shame the limits don't come from something
> shared; iec_binary_prefix goes upto 60 and si_prefix goes way below -9
>
> Reviewed-by: Dr. David Alan Gilbert<dgilbert@redhat.com>
>
I can remove the limits altogether, and consider it a bug of the
provider if they're not respected, but it's a bit ugly to have an
assertion failure in that case.
Paolo
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-06-08 14:13 ` Paolo Bonzini
@ 2022-06-08 14:52 ` Dr. David Alan Gilbert
2022-06-08 15:58 ` Paolo Bonzini
0 siblings, 1 reply; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 14:52 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru, Mark Kanda
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> On 6/7/22 19:44, Dr. David Alan Gilbert wrote:
>
> > > + return NULL;
> > > + }
> > > + descriptors->kvm_stats_header = kvm_stats_header;
> > > + descriptors->kvm_stats_desc = kvm_stats_desc;
> > > + descriptors->ident = g_strdup(ident);
> >
> > There's something that confuses me here; you check your set of
> > descriptors above to find any with the matching ident, and if you've
> > already got it you return it; OK. Now, if you don't match then you
> > read some stats and store it with that ident - but I don't see
> > when you read the stats from the fd, what makes it read the stats that
> > correspond to 'ident' ?
>
> If you mean why not some other source, each source has a different file
> descriptor:
>
> + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
>
> but the descriptors are consistent every time KVM_GET_STATS_FD is called, so
> basically "ident" can be used as a cache key.
Ah OK, this is what I was after; it's a little weird that the caller
does the ioctl to get the stats-fd, but it does the lookup internally
with current_cpu for the ident.
Some comments would help!
Dave
> If you mean how does it access the right stat, here it uses the offset
> field in the descriptor
>
> ret = pread(stats_fd, stats_data, size_data,
> kvm_stats_header->data_offset);
> ...
> for (i = 0; i < kvm_stats_header->num_desc; ++i) {
> uint64_t *stats;
> pdesc = (void *)kvm_stats_desc + i * size_desc;
>
> /* Add entry to the list */
> stats = (void *)stats_data + pdesc->offset;
>
> Paolo
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 06/10] hmp: add basic "info stats" implementation
2022-06-08 14:27 ` Paolo Bonzini
@ 2022-06-08 15:23 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 15:23 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru, Mark Kanda
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> On 6/7/22 20:35, Dr. David Alan Gilbert wrote:
> > > + monitor_printf(mon, "%s", iec_binary_prefix(value->exponent));
> > OK that's better; but it's a shame the limits don't come from something
> > shared; iec_binary_prefix goes upto 60 and si_prefix goes way below -9
> >
> > Reviewed-by: Dr. David Alan Gilbert<dgilbert@redhat.com>
> >
>
> I can remove the limits altogether, and consider it a bug of the provider if
> they're not respected, but it's a bit ugly to have an assertion failure in
> that case.
[I just noticed si_prefix is declared to take 'unsigned int' which is
probably wrong)
Why don't you change the si_prefix/iec_binary_prefix to return NULL
rather than asserting, then we end up with something like:
exponentstr = NULL;
if (unit && value->base == 10) {
exponentstr = si_prefix(value->exponent);
} else if (unit && value->base == 2) {
exponentstr = iec_binary_prefix(value->exponent);
}
if (exponentstr) {
monitor_printf(mon, "%s", exponentstr);
} else if (value->exponent) {
Dave
> Paolo
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-06-08 14:52 ` Dr. David Alan Gilbert
@ 2022-06-08 15:58 ` Paolo Bonzini
2022-06-08 16:01 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-06-08 15:58 UTC (permalink / raw)
To: Dr. David Alan Gilbert; +Cc: qemu-devel, armbru, Mark Kanda
On 6/8/22 16:52, Dr. David Alan Gilbert wrote:
>> If you mean why not some other source, each source has a different file
>> descriptor:
>>
>> + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
>>
>> but the descriptors are consistent every time KVM_GET_STATS_FD is called, so
>> basically "ident" can be used as a cache key.
>
> Ah OK, this is what I was after; it's a little weird that the caller
> does the ioctl to get the stats-fd, but it does the lookup internally
> with current_cpu for the ident.
Oh yeah that's weird.
Let me squash in this:
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 023bf4ea79..71896ad173 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -3871,17 +3871,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
size_t size_desc;
ssize_t ret;
- switch (target) {
- case STATS_TARGET_VM:
- ident = StatsTarget_str(STATS_TARGET_VM);
- break;
- case STATS_TARGET_VCPU:
- ident = current_cpu->parent_obj.canonical_path;
- break;
- default:
- abort();
- }
-
+ ident = StatsTarget_str(target);
QTAILQ_FOREACH(descriptors, &stats_descriptors, next) {
if (g_str_equal(descriptors->ident, ident)) {
return descriptors;
@@ -3917,7 +3907,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
}
descriptors->kvm_stats_header = kvm_stats_header;
descriptors->kvm_stats_desc = kvm_stats_desc;
- descriptors->ident = g_strdup(ident);
+ descriptors->ident = ident;
QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next);
return descriptors;
}
(once I test it).
Paolo
^ permalink raw reply related [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-06-08 15:58 ` Paolo Bonzini
@ 2022-06-08 16:01 ` Dr. David Alan Gilbert
2022-06-08 16:10 ` Paolo Bonzini
0 siblings, 1 reply; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 16:01 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru, Mark Kanda
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> On 6/8/22 16:52, Dr. David Alan Gilbert wrote:
> > > If you mean why not some other source, each source has a different file
> > > descriptor:
> > >
> > > + int stats_fd = kvm_vcpu_ioctl(cpu, KVM_GET_STATS_FD, NULL);
> > >
> > > but the descriptors are consistent every time KVM_GET_STATS_FD is called, so
> > > basically "ident" can be used as a cache key.
> >
> > Ah OK, this is what I was after; it's a little weird that the caller
> > does the ioctl to get the stats-fd, but it does the lookup internally
> > with current_cpu for the ident.
>
> Oh yeah that's weird.
>
> Let me squash in this:
Yeh that's nicer; a comment something like:
'Find descriptors for 'target', either that have already been read or
query 'stats_fd' to read them from kvm'
?
Dave
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 023bf4ea79..71896ad173 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -3871,17 +3871,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
> size_t size_desc;
> ssize_t ret;
> - switch (target) {
> - case STATS_TARGET_VM:
> - ident = StatsTarget_str(STATS_TARGET_VM);
> - break;
> - case STATS_TARGET_VCPU:
> - ident = current_cpu->parent_obj.canonical_path;
> - break;
> - default:
> - abort();
> - }
> -
> + ident = StatsTarget_str(target);
> QTAILQ_FOREACH(descriptors, &stats_descriptors, next) {
> if (g_str_equal(descriptors->ident, ident)) {
> return descriptors;
> @@ -3917,7 +3907,7 @@ static StatsDescriptors *find_stats_descriptors(StatsTarget target, int stats_fd
> }
> descriptors->kvm_stats_header = kvm_stats_header;
> descriptors->kvm_stats_desc = kvm_stats_desc;
> - descriptors->ident = g_strdup(ident);
> + descriptors->ident = ident;
> QTAILQ_INSERT_TAIL(&stats_descriptors, descriptors, next);
> return descriptors;
> }
>
> (once I test it).
>
> Paolo
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-06-08 16:01 ` Dr. David Alan Gilbert
@ 2022-06-08 16:10 ` Paolo Bonzini
2022-06-08 16:17 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 28+ messages in thread
From: Paolo Bonzini @ 2022-06-08 16:10 UTC (permalink / raw)
To: Dr. David Alan Gilbert; +Cc: qemu-devel, armbru, Mark Kanda
On 6/8/22 18:01, Dr. David Alan Gilbert wrote:
> 'Find descriptors for 'target', either that have already been read or
> query 'stats_fd' to read them from kvm'
/*
* Return the descriptors for 'target', that either have already been
* read or are retrieved from 'stats_fd'.
*/
Paolo
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v5 02/10] kvm: Support for querying fd-based stats
2022-06-08 16:10 ` Paolo Bonzini
@ 2022-06-08 16:17 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 28+ messages in thread
From: Dr. David Alan Gilbert @ 2022-06-08 16:17 UTC (permalink / raw)
To: Paolo Bonzini; +Cc: qemu-devel, armbru, Mark Kanda
* Paolo Bonzini (pbonzini@redhat.com) wrote:
> On 6/8/22 18:01, Dr. David Alan Gilbert wrote:
> > 'Find descriptors for 'target', either that have already been read or
> > query 'stats_fd' to read them from kvm'
>
> /*
> * Return the descriptors for 'target', that either have already been
> * read or are retrieved from 'stats_fd'.
> */
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Paolo
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
^ permalink raw reply [flat|nested] 28+ messages in thread
end of thread, other threads:[~2022-06-08 16:24 UTC | newest]
Thread overview: 28+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-05-30 15:07 [PATCH v5 00/10] qmp, hmp: statistics subsystem and KVM suport Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 01/10] qmp: Support for querying stats Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 02/10] kvm: Support for querying fd-based stats Paolo Bonzini
2022-06-07 17:44 ` Dr. David Alan Gilbert
2022-06-08 14:13 ` Paolo Bonzini
2022-06-08 14:52 ` Dr. David Alan Gilbert
2022-06-08 15:58 ` Paolo Bonzini
2022-06-08 16:01 ` Dr. David Alan Gilbert
2022-06-08 16:10 ` Paolo Bonzini
2022-06-08 16:17 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 03/10] qmp: add filtering of statistics by target vCPU Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 04/10] cutils: fix case for "kilo" and "kibi" Paolo Bonzini
2022-05-30 21:56 ` Philippe Mathieu-Daudé via
2022-05-30 15:07 ` [PATCH v5 05/10] cutils: add functions for IEC and SI prefixes Paolo Bonzini
2022-05-30 21:59 ` Philippe Mathieu-Daudé via
2022-05-31 10:28 ` Paolo Bonzini
2022-05-30 15:07 ` [PATCH v5 06/10] hmp: add basic "info stats" implementation Paolo Bonzini
2022-06-07 18:35 ` Dr. David Alan Gilbert
2022-06-08 14:27 ` Paolo Bonzini
2022-06-08 15:23 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 07/10] qmp: add filtering of statistics by provider Paolo Bonzini
2022-06-08 11:52 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 08/10] hmp: " Paolo Bonzini
2022-06-08 12:06 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 09/10] qmp: add filtering of statistics by name Paolo Bonzini
2022-06-08 13:36 ` Dr. David Alan Gilbert
2022-05-30 15:07 ` [PATCH v5 10/10] hmp: " Paolo Bonzini
2022-06-08 13:40 ` Dr. David Alan Gilbert
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