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perf tools: Add read_cgroup_id() function

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The read_cgroup_id() is to read a cgroup id from a file handle using
name_to_handle_at(2) for the given cgroup.  It'll be used by bperf
cgroup stat later.

Committer notes:

  -int read_cgroup_id(struct cgroup *cgrp)
  +static inline int read_cgroup_id(struct cgroup *cgrp __maybe_unused)

To fix the build when HAVE_FILE_HANDLE is not defined.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210625071826.608504-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2021-06-25 00:18:23 -07:00 committed by Arnaldo Carvalho de Melo
parent f20510d552
commit 69e874db4d
2 changed files with 35 additions and 0 deletions
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25
tools/perf/util/cgroup.c
View File

@ -45,6 +45,31 @@ static int open_cgroup(const char *name)
return fd;
}
#ifdef HAVE_FILE_HANDLE
int read_cgroup_id(struct cgroup *cgrp)
{
char path[PATH_MAX + 1];
char mnt[PATH_MAX + 1];
struct {
struct file_handle fh;
uint64_t cgroup_id;
} handle;
int mount_id;
if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event"))
return -1;
scnprintf(path, PATH_MAX, "%s/%s", mnt, cgrp->name);
handle.fh.handle_bytes = sizeof(handle.cgroup_id);
if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0)
return -1;
cgrp->id = handle.cgroup_id;
return 0;
}
#endif /* HAVE_FILE_HANDLE */
static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str)
{
struct evsel *counter;

10
tools/perf/util/cgroup.h
View File

@ -2,6 +2,7 @@
#ifndef __CGROUP_H__
#define __CGROUP_H__
#include <linux/compiler.h>
#include <linux/refcount.h>
#include <linux/rbtree.h>
#include "util/env.h"
@ -38,4 +39,13 @@ struct cgroup *cgroup__find(struct perf_env *env, uint64_t id);
void perf_env__purge_cgroups(struct perf_env *env);
#ifdef HAVE_FILE_HANDLE
int read_cgroup_id(struct cgroup *cgrp);
#else
static inline int read_cgroup_id(struct cgroup *cgrp __maybe_unused)
{
return -1;
}
#endif /* HAVE_FILE_HANDLE */
#endif /* __CGROUP_H__ */