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perf stat: Support regex pattern in --for-each-cgroup

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To make the command line even more compact with cgroups, support regex
pattern matching in cgroup names.

  $ perf stat -a -e cpu-clock,cycles --for-each-cgroup ^foo sleep 1

          3,000.73 msec cpu-clock                 foo #    2.998 CPUs utilized
    12,530,992,699      cycles                    foo #    7.517 GHz                      (100.00%)
          1,000.61 msec cpu-clock                 foo/bar #    1.000 CPUs utilized
     4,178,529,579      cycles                    foo/bar #    2.506 GHz                      (100.00%)
          1,000.03 msec cpu-clock                 foo/baz #    0.999 CPUs utilized
     4,176,104,315      cycles                    foo/baz #    2.505 GHz                      (100.00%)

       1.000892614 seconds time elapsed

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20201027072855.655449-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2020-10-27 16:28:55 +09:00 committed by Arnaldo Carvalho de Melo
parent 9b0a783635
commit bb1c15b60b
3 changed files with 183 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
tools/perf/Documentation/perf-stat.txt
View file

@ -168,8 +168,9 @@ command line can be used: 'perf stat -e cycles -G cgroup_name -a -e cycles'.
--for-each-cgroup name::
Expand event list for each cgroup in "name" (allow multiple cgroups separated
by comma). This has same effect that repeating -e option and -G option for
each event x name. This option cannot be used with -G/--cgroup option.
by comma). It also support regex patterns to match multiple groups. This has same
effect that repeating -e option and -G option for each event x name. This option
cannot be used with -G/--cgroup option.
-o file::
--output file::

5
tools/perf/builtin-stat.c
View file

@ -2235,8 +2235,11 @@ int cmd_stat(int argc, const char **argv)
}
if (evlist__expand_cgroup(evsel_list, stat_config.cgroup_list,
&stat_config.metric_events, true) < 0)
&stat_config.metric_events, true) < 0) {
parse_options_usage(stat_usage, stat_options,
"for-each-cgroup", 0);
goto out;
}
}
target__validate(&target);

200
tools/perf/util/cgroup.c
View file

@ -13,9 +13,19 @@
#include <stdlib.h>
#include <string.h>
#include <api/fs/fs.h>
#include <ftw.h>
#include <regex.h>
int nr_cgroups;
/* used to match cgroup name with patterns */
struct cgroup_name {
struct list_head list;
bool used;
char name[];
};
static LIST_HEAD(cgroup_list);
static int open_cgroup(const char *name)
{
char path[PATH_MAX + 1];
@ -149,6 +159,137 @@ void evlist__set_default_cgroup(struct evlist *evlist, struct cgroup *cgroup)
evsel__set_default_cgroup(evsel, cgroup);
}
/* helper function for ftw() in match_cgroups and list_cgroups */
static int add_cgroup_name(const char *fpath, const struct stat *sb __maybe_unused,
int typeflag)
{
struct cgroup_name *cn;
if (typeflag != FTW_D)
return 0;
cn = malloc(sizeof(*cn) + strlen(fpath) + 1);
if (cn == NULL)
return -1;
cn->used = false;
strcpy(cn->name, fpath);
list_add_tail(&cn->list, &cgroup_list);
return 0;
}
static void release_cgroup_list(void)
{
struct cgroup_name *cn;
while (!list_empty(&cgroup_list)) {
cn = list_first_entry(&cgroup_list, struct cgroup_name, list);
list_del(&cn->list);
free(cn);
}
}
/* collect given cgroups only */
static int list_cgroups(const char *str)
{
const char *p, *e, *eos = str + strlen(str);
struct cgroup_name *cn;
char *s;
/* use given name as is - for testing purpose */
for (;;) {
p = strchr(str, ',');
e = p ? p : eos;
if (e - str) {
int ret;
s = strndup(str, e - str);
if (!s)
return -1;
/* pretend if it's added by ftw() */
ret = add_cgroup_name(s, NULL, FTW_D);
free(s);
if (ret)
return -1;
} else {
if (add_cgroup_name("", NULL, FTW_D) < 0)
return -1;
}
if (!p)
break;
str = p+1;
}
/* these groups will be used */
list_for_each_entry(cn, &cgroup_list, list)
cn->used = true;
return 0;
}
/* collect all cgroups first and then match with the pattern */
static int match_cgroups(const char *str)
{
char mnt[PATH_MAX];
const char *p, *e, *eos = str + strlen(str);
struct cgroup_name *cn;
regex_t reg;
int prefix_len;
char *s;
if (cgroupfs_find_mountpoint(mnt, sizeof(mnt), "perf_event"))
return -1;
/* cgroup_name will have a full path, skip the root directory */
prefix_len = strlen(mnt);
/* collect all cgroups in the cgroup_list */
if (ftw(mnt, add_cgroup_name, 20) < 0)
return -1;
for (;;) {
p = strchr(str, ',');
e = p ? p : eos;
/* allow empty cgroups, i.e., skip */
if (e - str) {
/* termination added */
s = strndup(str, e - str);
if (!s)
return -1;
if (regcomp(&reg, s, REG_NOSUB)) {
free(s);
return -1;
}
/* check cgroup name with the pattern */
list_for_each_entry(cn, &cgroup_list, list) {
char *name = cn->name + prefix_len;
if (name[0] == '/' && name[1])
name++;
if (!regexec(&reg, name, 0, NULL, 0))
cn->used = true;
}
regfree(&reg);
free(s);
} else {
/* first entry to root cgroup */
cn = list_first_entry(&cgroup_list, struct cgroup_name,
list);
cn->used = true;
}
if (!p)
break;
str = p+1;
}
return prefix_len;
}
int parse_cgroups(const struct option *opt, const char *str,
int unset __maybe_unused)
{
@ -201,6 +342,11 @@ int parse_cgroups(const struct option *opt, const char *str,
return 0;
}
static bool has_pattern_string(const char *str)
{
return !!strpbrk(str, "{}[]()|*+?^$");
}
int evlist__expand_cgroup(struct evlist *evlist, const char *str,
struct rblist *metric_events, bool open_cgroup)
{
@ -208,8 +354,9 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str,
struct evsel *pos, *evsel, *leader;
struct rblist orig_metric_events;
struct cgroup *cgrp = NULL;
const char *p, *e, *eos = str + strlen(str);
struct cgroup_name *cn;
int ret = -1;
int prefix_len;
if (evlist->core.nr_entries == 0) {
fprintf(stderr, "must define events before cgroups\n");
@ -234,24 +381,27 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str,
rblist__init(&orig_metric_events);
}
for (;;) {
p = strchr(str, ',');
e = p ? p : eos;
if (has_pattern_string(str))
prefix_len = match_cgroups(str);
else
prefix_len = list_cgroups(str);
/* allow empty cgroups, i.e., skip */
if (e - str) {
/* termination added */
char *name = strndup(str, e - str);
if (!name)
goto out_err;
if (prefix_len < 0)
goto out_err;
cgrp = cgroup__new(name, open_cgroup);
free(name);
if (cgrp == NULL)
goto out_err;
} else {
cgrp = NULL;
}
list_for_each_entry(cn, &cgroup_list, list) {
char *name;
if (!cn->used)
continue;
/* cgroup_name might have a full path, skip the prefix */
name = cn->name + prefix_len;
if (name[0] == '/' && name[1])
name++;
cgrp = cgroup__new(name, open_cgroup);
if (cgrp == NULL)
goto out_err;
leader = NULL;
evlist__for_each_entry(orig_list, pos) {
@ -277,23 +427,25 @@ int evlist__expand_cgroup(struct evlist *evlist, const char *str,
if (metricgroup__copy_metric_events(tmp_list, cgrp,
metric_events,
&orig_metric_events) < 0)
break;
goto out_err;
}
perf_evlist__splice_list_tail(evlist, &tmp_list->core.entries);
tmp_list->core.nr_entries = 0;
if (!p) {
ret = 0;
break;
}
str = p+1;
}
if (list_empty(&evlist->core.entries)) {
fprintf(stderr, "no cgroup matched: %s\n", str);
goto out_err;
}
ret = 0;
out_err:
evlist__delete(orig_list);
evlist__delete(tmp_list);
rblist__exit(&orig_metric_events);
release_cgroup_list();
return ret;
}