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    Subject[PATCH 12/54] perf cgroup: Add evlist__add_default_cgroup()
    Date
    From: Arnaldo Carvalho de Melo <acme@redhat.com>

    So that tools like 'perf trace' can allow the user to set a cgroup
    to be used for all the evsels still without a crgroup setup by
    parse_cgroups(), such as the one to use for the syscalls, vfs_getname
    and other events involved in strace like syscall tracing.

    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: https://lkml.kernel.org/n/tip-zf9jjsbj661r3lk6qb7g8j70@git.kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/cgroup.c | 14 ++++++++++++++
    tools/perf/util/cgroup.h | 2 ++
    2 files changed, 16 insertions(+)

    diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
    index 6fd33ffc2488..d8cd0e601c56 100644
    --- a/tools/perf/util/cgroup.c
    +++ b/tools/perf/util/cgroup.c
    @@ -182,6 +182,20 @@ struct cgroup *cgroup__get(struct cgroup *cgroup)
    return cgroup;
    }

    +static void evsel__set_default_cgroup(struct perf_evsel *evsel, struct cgroup *cgroup)
    +{
    + if (evsel->cgrp == NULL)
    + evsel->cgrp = cgroup__get(cgroup);
    +}
    +
    +void evlist__set_default_cgroup(struct perf_evlist *evlist, struct cgroup *cgroup)
    +{
    + struct perf_evsel *evsel;
    +
    + evlist__for_each_entry(evlist, evsel)
    + evsel__set_default_cgroup(evsel, cgroup);
    +}
    +
    int parse_cgroups(const struct option *opt, const char *str,
    int unset __maybe_unused)
    {
    diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
    index 0e377e6340dd..b213f5e9a3ed 100644
    --- a/tools/perf/util/cgroup.h
    +++ b/tools/perf/util/cgroup.h
    @@ -22,6 +22,8 @@ struct perf_evlist;

    struct cgroup *evlist__findnew_cgroup(struct perf_evlist *evlist, char *name);

    +void evlist__set_default_cgroup(struct perf_evlist *evlist, struct cgroup *cgroup);
    +
    int parse_cgroups(const struct option *opt, const char *str, int unset);

    #endif /* __CGROUP_H__ */
    --
    2.14.3
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