From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
Ian Jackson <iwj@xenproject.org>, Jan Beulich <jbeulich@suse.com>,
Julien Grall <julien@xen.org>,
Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
Dario Faggioli <dfaggioli@suse.com>
Subject: [PATCH v2 16/17] xen/cpupool: add scheduling granularity entry to cpupool entries
Date: Tue, 1 Dec 2020 09:21:27 +0100 [thread overview]
Message-ID: <20201201082128.15239-17-jgross@suse.com> (raw)
In-Reply-To: <20201201082128.15239-1-jgross@suse.com>
Add a "sched-gran" entry to the per-cpupool hypfs directories.
For now make this entry read-only and let it contain one of the
strings "cpu", "core" or "socket".
Signed-off-by: Juergen Gross <jgross@suse.com>
---
V2:
- added const (Jan Beulich)
- modify test in cpupool_gran_read() (Jan Beulich)
---
docs/misc/hypfs-paths.pandoc | 4 +++
xen/common/sched/cpupool.c | 69 ++++++++++++++++++++++++++++++++++--
2 files changed, 70 insertions(+), 3 deletions(-)
diff --git a/docs/misc/hypfs-paths.pandoc b/docs/misc/hypfs-paths.pandoc
index aaca1cdf92..f1ce24d7fe 100644
--- a/docs/misc/hypfs-paths.pandoc
+++ b/docs/misc/hypfs-paths.pandoc
@@ -184,6 +184,10 @@ A directory of all current cpupools.
The individual cpupools. Each entry is a directory with the name being the
cpupool-id (e.g. /cpupool/0/).
+#### /cpupool/*/sched-gran = ("cpu" | "core" | "socket")
+
+The scheduling granularity of a cpupool.
+
#### /params/
A directory of runtime parameters.
diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c
index 3e17fdf95b..cfc75ccbe4 100644
--- a/xen/common/sched/cpupool.c
+++ b/xen/common/sched/cpupool.c
@@ -41,9 +41,10 @@ static DEFINE_SPINLOCK(cpupool_lock);
static enum sched_gran __read_mostly opt_sched_granularity = SCHED_GRAN_cpu;
static unsigned int __read_mostly sched_granularity = 1;
+#define SCHED_GRAN_NAME_LEN 8
struct sched_gran_name {
enum sched_gran mode;
- char name[8];
+ char name[SCHED_GRAN_NAME_LEN];
};
static const struct sched_gran_name sg_name[] = {
@@ -52,7 +53,7 @@ static const struct sched_gran_name sg_name[] = {
{SCHED_GRAN_socket, "socket"},
};
-static void sched_gran_print(enum sched_gran mode, unsigned int gran)
+static const char *sched_gran_get_name(enum sched_gran mode)
{
const char *name = "";
unsigned int i;
@@ -66,8 +67,13 @@ static void sched_gran_print(enum sched_gran mode, unsigned int gran)
}
}
+ return name;
+}
+
+static void sched_gran_print(enum sched_gran mode, unsigned int gran)
+{
printk("Scheduling granularity: %s, %u CPU%s per sched-resource\n",
- name, gran, gran == 1 ? "" : "s");
+ sched_gran_get_name(mode), gran, gran == 1 ? "" : "s");
}
#ifdef CONFIG_HAS_SCHED_GRANULARITY
@@ -1033,9 +1039,14 @@ static int cpupool_dir_read(const struct hypfs_entry *entry,
int ret = 0;
const struct cpupool *c;
unsigned int size = 0;
+ struct hypfs_dyndir_id *data;
+
+ data = hypfs_get_dyndata();
list_for_each_entry(c, &cpupool_list, list)
{
+ data->id = c->cpupool_id;
+
size += hypfs_dynid_entry_size(entry, c->cpupool_id);
ret = hypfs_read_dyndir_id_entry(&cpupool_pooldir, c->cpupool_id,
@@ -1100,6 +1111,56 @@ static struct hypfs_entry *cpupool_dir_findentry(
return hypfs_gen_dyndir_entry_id(&cpupool_pooldir, id);
}
+static int cpupool_gran_read(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr)
+{
+ const struct hypfs_dyndir_id *data;
+ const struct cpupool *cpupool;
+ const char *gran;
+
+ data = hypfs_get_dyndata();
+ cpupool = __cpupool_find_by_id(data->id, true);
+ ASSERT(cpupool);
+
+ gran = sched_gran_get_name(cpupool->gran);
+
+ if ( !*gran )
+ return -ENOENT;
+
+ return copy_to_guest(uaddr, gran, strlen(gran) + 1) ? -EFAULT : 0;
+}
+
+static unsigned int hypfs_gran_getsize(const struct hypfs_entry *entry)
+{
+ const struct hypfs_dyndir_id *data;
+ const struct cpupool *cpupool;
+ const char *gran;
+
+ data = hypfs_get_dyndata();
+ cpupool = __cpupool_find_by_id(data->id, true);
+ ASSERT(cpupool);
+
+ gran = sched_gran_get_name(cpupool->gran);
+
+ return strlen(gran) + 1;
+}
+
+static struct hypfs_funcs cpupool_gran_funcs = {
+ .enter = hypfs_node_enter,
+ .exit = hypfs_node_exit,
+ .read = cpupool_gran_read,
+ .write = hypfs_write_deny,
+ .getsize = hypfs_gran_getsize,
+ .findentry = hypfs_leaf_findentry,
+};
+
+static HYPFS_VARSIZE_INIT(cpupool_gran, XEN_HYPFS_TYPE_STRING, "sched-gran",
+ 0, &cpupool_gran_funcs);
+static char granstr[SCHED_GRAN_NAME_LEN] = {
+ [0 ... SCHED_GRAN_NAME_LEN - 2] = '?',
+ [SCHED_GRAN_NAME_LEN - 1] = 0
+};
+
static struct hypfs_funcs cpupool_dir_funcs = {
.enter = cpupool_dir_enter,
.exit = cpupool_dir_exit,
@@ -1115,6 +1176,8 @@ static void cpupool_hypfs_init(void)
{
hypfs_add_dir(&hypfs_root, &cpupool_dir, true);
hypfs_add_dyndir(&cpupool_dir, &cpupool_pooldir);
+ hypfs_string_set_reference(&cpupool_gran, granstr);
+ hypfs_add_leaf(&cpupool_pooldir, &cpupool_gran, true);
}
#else
--
2.26.2
next prev parent reply other threads:[~2020-12-01 8:22 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 8:21 [PATCH v2 00/17] xen: support per-cpupool scheduling granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 01/17] xen/cpupool: add cpu to sched_res_mask when removing it from cpupool Juergen Gross
2020-12-01 8:21 ` [PATCH v2 02/17] xen/cpupool: add missing bits for per-cpupool scheduling granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 03/17] xen/cpupool: sort included headers in cpupool.c Juergen Gross
2020-12-01 8:21 ` [PATCH v2 04/17] xen/cpupool: switch cpupool id to unsigned Juergen Gross
2020-12-01 8:55 ` Jan Beulich
2020-12-01 9:01 ` Jürgen Groß
2020-12-01 9:07 ` Jan Beulich
2020-12-07 9:59 ` Jan Beulich
2020-12-07 14:48 ` Jürgen Groß
2020-12-07 15:00 ` Jan Beulich
2020-12-04 15:52 ` Dario Faggioli
2020-12-07 9:58 ` Jan Beulich
2020-12-07 15:21 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 05/17] xen/cpupool: switch cpupool list to normal list interface Juergen Gross
2020-12-01 9:12 ` Jan Beulich
2020-12-01 9:18 ` Jürgen Groß
2020-12-04 16:13 ` Dario Faggioli
2020-12-04 16:16 ` Jürgen Groß
2020-12-04 16:25 ` Dario Faggioli
2020-12-04 16:56 ` Dario Faggioli
2020-12-01 8:21 ` [PATCH v2 06/17] xen/cpupool: use ERR_PTR() for returning error cause from cpupool_create() Juergen Gross
2020-12-02 8:58 ` Jan Beulich
2020-12-02 9:56 ` Jürgen Groß
2020-12-02 10:46 ` Jan Beulich
2020-12-02 10:58 ` Jürgen Groß
2020-12-04 16:29 ` Dario Faggioli
2020-12-01 8:21 ` [PATCH v2 07/17] xen/cpupool: support moving domain between cpupools with different granularity Juergen Gross
2020-12-01 8:21 ` [PATCH v2 08/17] docs: fix hypfs path documentation Juergen Gross
2020-12-01 8:21 ` [PATCH v2 09/17] xen/hypfs: move per-node function pointers into a dedicated struct Juergen Gross
2020-12-02 15:36 ` Jan Beulich
2020-12-02 15:41 ` Jürgen Groß
2020-12-03 8:47 ` Jürgen Groß
2020-12-03 9:12 ` Jan Beulich
2020-12-03 9:51 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 10/17] xen/hypfs: pass real failure reason up from hypfs_get_entry() Juergen Gross
2020-12-01 8:21 ` [PATCH v2 11/17] xen/hypfs: add getsize() and findentry() callbacks to hypfs_funcs Juergen Gross
2020-12-02 15:42 ` Jan Beulich
2020-12-02 15:51 ` Jürgen Groß
2020-12-03 8:12 ` Jan Beulich
2020-12-03 9:39 ` Jürgen Groß
2020-12-04 8:58 ` Jan Beulich
2020-12-04 11:14 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 12/17] xen/hypfs: add new enter() and exit() per node callbacks Juergen Gross
2020-12-03 14:59 ` Jan Beulich
2020-12-03 15:14 ` Jürgen Groß
2020-12-03 15:29 ` Jan Beulich
2020-12-04 8:33 ` Jürgen Groß
2020-12-04 8:30 ` Jan Beulich
2020-12-04 8:35 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 13/17] xen/hypfs: support dynamic hypfs nodes Juergen Gross
2020-12-03 15:08 ` Jan Beulich
2020-12-03 15:18 ` Jürgen Groß
2020-12-01 8:21 ` [PATCH v2 14/17] xen/hypfs: add support for id-based dynamic directories Juergen Gross
2020-12-03 15:44 ` Jan Beulich
2020-12-04 8:52 ` Jürgen Groß
2020-12-04 9:16 ` Jan Beulich
2020-12-04 13:08 ` Jürgen Groß
2020-12-07 7:54 ` Jan Beulich
2020-12-01 8:21 ` [PATCH v2 15/17] xen/cpupool: add cpupool directories Juergen Gross
2020-12-01 9:00 ` Jan Beulich
2020-12-01 9:03 ` Jürgen Groß
2020-12-02 15:46 ` Jürgen Groß
2020-12-03 14:46 ` Jan Beulich
2020-12-03 15:11 ` Jürgen Groß
2020-12-04 9:10 ` Jan Beulich
2020-12-04 11:08 ` Jürgen Groß
2020-12-04 11:54 ` Jan Beulich
2020-12-01 8:21 ` Juergen Gross [this message]
2020-12-01 8:21 ` [PATCH v2 17/17] xen/cpupool: make per-cpupool sched-gran hypfs node writable Juergen Gross
2020-12-04 23:53 ` [PATCH v2 00/17] xen: support per-cpupool scheduling granularity Andrew Cooper
2020-12-05 7:41 ` Jürgen Groß
2020-12-07 9:00 ` Jan Beulich
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