From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [for-next][PATCH 29/46] tracing: Add cpu field for hist triggers
Date: Tue, 20 Mar 2018 22:21:21 -0400 [thread overview]
Message-ID: <20180321022128.458684839@goodmis.org> (raw)
In-Reply-To: 20180321022052.030055576@goodmis.org
[-- Attachment #1: 0029-tracing-Add-cpu-field-for-hist-triggers.patch --]
[-- Type: text/plain, Size: 4173 bytes --]
From: Tom Zanussi <tom.zanussi@linux.intel.com>
A common key to use in a histogram is the cpuid - add a new cpu
'synthetic' field named 'cpu' for that purpose.
Link: http://lkml.kernel.org/r/89537645bfc957e0d76e2cacf5f0ada88691a6cc.1516069914.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
Documentation/trace/histogram.txt | 15 +++++++++++++++
kernel/trace/trace_events_hist.c | 28 +++++++++++++++++++++++++++-
2 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/Documentation/trace/histogram.txt b/Documentation/trace/histogram.txt
index 25c94730d3fe..be612ca79455 100644
--- a/Documentation/trace/histogram.txt
+++ b/Documentation/trace/histogram.txt
@@ -172,6 +172,21 @@
The examples below provide a more concrete illustration of the
concepts and typical usage patterns discussed above.
+ 'special' event fields
+ ------------------------
+
+ There are a number of 'special event fields' available for use as
+ keys or values in a hist trigger. These look like and behave as if
+ they were actual event fields, but aren't really part of the event's
+ field definition or format file. They are however available for any
+ event, and can be used anywhere an actual event field could be.
+ They are:
+
+ common_timestamp u64 - timestamp (from ring buffer) associated
+ with the event, in nanoseconds. May be
+ modified by .usecs to have timestamps
+ interpreted as microseconds.
+ cpu int - the cpu on which the event occurred.
6.2 'hist' trigger examples
---------------------------
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 7e88daae85b6..98be6ad883eb 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -227,6 +227,7 @@ enum hist_field_flags {
HIST_FIELD_FL_VAR = 1 << 12,
HIST_FIELD_FL_EXPR = 1 << 13,
HIST_FIELD_FL_VAR_REF = 1 << 14,
+ HIST_FIELD_FL_CPU = 1 << 15,
};
struct var_defs {
@@ -1164,6 +1165,16 @@ static u64 hist_field_timestamp(struct hist_field *hist_field,
return ts;
}
+static u64 hist_field_cpu(struct hist_field *hist_field,
+ struct tracing_map_elt *elt,
+ struct ring_buffer_event *rbe,
+ void *event)
+{
+ int cpu = smp_processor_id();
+
+ return cpu;
+}
+
static struct hist_field *
check_field_for_var_ref(struct hist_field *hist_field,
struct hist_trigger_data *var_data,
@@ -1602,6 +1613,8 @@ static const char *hist_field_name(struct hist_field *field,
field_name = hist_field_name(field->operands[0], ++level);
else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
field_name = "common_timestamp";
+ else if (field->flags & HIST_FIELD_FL_CPU)
+ field_name = "cpu";
else if (field->flags & HIST_FIELD_FL_EXPR ||
field->flags & HIST_FIELD_FL_VAR_REF) {
if (field->system) {
@@ -2109,6 +2122,15 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
goto out;
}
+ if (flags & HIST_FIELD_FL_CPU) {
+ hist_field->fn = hist_field_cpu;
+ hist_field->size = sizeof(int);
+ hist_field->type = kstrdup("unsigned int", GFP_KERNEL);
+ if (!hist_field->type)
+ goto free;
+ goto out;
+ }
+
if (WARN_ON_ONCE(!field))
goto out;
@@ -2345,7 +2367,9 @@ parse_field(struct hist_trigger_data *hist_data, struct trace_event_file *file,
hist_data->enable_timestamps = true;
if (*flags & HIST_FIELD_FL_TIMESTAMP_USECS)
hist_data->attrs->ts_in_usecs = true;
- } else {
+ } else if (strcmp(field_name, "cpu") == 0)
+ *flags |= HIST_FIELD_FL_CPU;
+ else {
field = trace_find_event_field(file->event_call, field_name);
if (!field || !field->size) {
field = ERR_PTR(-EINVAL);
@@ -4619,6 +4643,8 @@ static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP)
seq_puts(m, "common_timestamp");
+ else if (hist_field->flags & HIST_FIELD_FL_CPU)
+ seq_puts(m, "cpu");
else if (field_name) {
if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
seq_putc(m, '$');
--
2.15.1
next prev parent reply other threads:[~2018-03-21 2:25 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-21 2:20 [for-next][PATCH 00/46] tracing: Updates for v4.17 Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 01/46] tracing: Move hist trigger Documentation to histogram.txt Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 02/46] tracing: Add Documentation for log2 modifier Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 03/46] tracing: Add support to detect and avoid duplicates Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 04/46] tracing: Remove code which merges duplicates Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 05/46] ring-buffer: Add interface for setting absolute time stamps Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 06/46] ring-buffer: Redefine the unimplemented RINGBUF_TYPE_TIME_STAMP Steven Rostedt
2018-03-21 2:20 ` [for-next][PATCH 07/46] tracing: Add timestamp_mode trace file Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 08/46] tracing: Give event triggers access to ring_buffer_event Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 09/46] tracing: Add ring buffer event param to hist field functions Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 10/46] tracing: Break out hist trigger assignment parsing Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 11/46] tracing: Add hist trigger timestamp support Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 12/46] tracing: Add per-element variable support to tracing_map Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 13/46] tracing: Add hist_data member to hist_field Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 14/46] tracing: Add usecs modifier for hist trigger timestamps Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 15/46] tracing: Add variable support to hist triggers Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 16/46] tracing: Account for variables in named trigger compatibility Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 17/46] tracing: Move get_hist_field_flags() Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 18/46] tracing: Add simple expression support to hist triggers Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 19/46] tracing: Generalize per-element hist trigger data Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 20/46] tracing: Pass tracing_map_elt to hist_field accessor functions Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 21/46] tracing: Add hist_field type field Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 22/46] tracing: Add variable reference handling to hist triggers Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 23/46] tracing: Add hist trigger action hook Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 24/46] tracing: Add support for synthetic events Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 25/46] tracing: Add support for field variables Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 26/46] tracing: Add onmatch hist trigger action support Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 27/46] tracing: Add onmax " Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 28/46] tracing: Allow whitespace to surround hist trigger filter Steven Rostedt
2018-03-21 2:21 ` Steven Rostedt [this message]
2018-03-21 2:21 ` [for-next][PATCH 30/46] tracing: Add hist trigger support for variable reference aliases Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 31/46] tracing: Add last error error facility for hist triggers Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 32/46] tracing: Add inter-event hist trigger Documentation Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 33/46] tracing: Make tracing_set_clock() non-static Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 34/46] tracing: Add a clock attribute for hist triggers Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 35/46] ring-buffer: Add nesting for adding events within events Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 36/46] tracing: Use the ring-buffer nesting to allow synthetic events to be traced Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 37/46] tracing: Add inter-event blurb to HIST_TRIGGERS config option Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 38/46] selftests: ftrace: Add inter-event hist triggers testcases Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 39/46] tracing: Remove BUG_ON() from append_filter_string() Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 40/46] tracing: Use trace_seq instead of open code string appending Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 41/46] tracing: Remove filter allocator helper Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 42/46] tracing: Only add filter list when needed Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 43/46] tracing: Embed replace_filter_string() helper function Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 44/46] tracing: Combine enum and arrays into single macro in filter code Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 45/46] tracing: Clean up and document pred_funcs_##type creation and use Steven Rostedt
2018-03-21 2:21 ` [for-next][PATCH 46/46] tracing: Rewrite filter logic to be simpler and faster Steven Rostedt
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