lkml.org 
[lkml]   [2018]   [Jan]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 05/49] perf tools: Use a software dummy event to track task/mmap events
    Date
    From: Namhyung Kim <namhyung@kernel.org>

    Add APIs for software dummy event to track task/comm/mmap events
    separately. The perf record will use them to save such events in
    a separate mmap buffer to make it easy to index. This is just a
    preparation of multi-thread support which will come later.

    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Link: http://lkml.kernel.org/n/tip-qo7opc5kb3ueuicyjdyqupkh@git.kernel.org
    Signed-off-by: Namhyung Kim <namhyung@kernel.org>
    Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    ---
    tools/perf/util/evlist.c | 30 ++++++++++++++++++++++++++++++
    tools/perf/util/evlist.h | 1 +
    tools/perf/util/evsel.h | 15 +++++++++++++++
    3 files changed, 46 insertions(+)

    diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
    index f0a5e09c4071..4e5027e590e2 100644
    --- a/tools/perf/util/evlist.c
    +++ b/tools/perf/util/evlist.c
    @@ -266,6 +266,36 @@ int perf_evlist__add_dummy(struct perf_evlist *evlist)
    return 0;
    }

    +int perf_evlist__add_dummy_tracking(struct perf_evlist *evlist)
    +{
    + struct perf_event_attr attr = {
    + .type = PERF_TYPE_SOFTWARE,
    + .config = PERF_COUNT_SW_DUMMY,
    + .exclude_kernel = 1,
    + };
    + struct perf_evsel *evsel;
    +
    + event_attr_init(&attr);
    +
    + evsel = perf_evsel__new(&attr);
    + if (evsel == NULL)
    + goto error;
    +
    + /* use strdup() because free(evsel) assumes name is allocated */
    + evsel->name = strdup("dummy");
    + if (!evsel->name)
    + goto error_free;
    +
    + perf_evlist__add(evlist, evsel);
    + perf_evlist__set_tracking_event(evlist, evsel);
    +
    + return 0;
    +error_free:
    + perf_evsel__delete(evsel);
    +error:
    + return -ENOMEM;
    +}
    +
    static int perf_evlist__add_attrs(struct perf_evlist *evlist,
    struct perf_event_attr *attrs, size_t nr_attrs)
    {
    diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
    index e7fbca69cbac..dff82a5853ad 100644
    --- a/tools/perf/util/evlist.h
    +++ b/tools/perf/util/evlist.h
    @@ -77,6 +77,7 @@ static inline int perf_evlist__add_default(struct perf_evlist *evlist)
    return __perf_evlist__add_default(evlist, true);
    }

    +int perf_evlist__add_dummy_tracking(struct perf_evlist *evlist);
    int __perf_evlist__add_default_attrs(struct perf_evlist *evlist,
    struct perf_event_attr *attrs, size_t nr_attrs);

    diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
    index 846e41644525..9525d0a0212e 100644
    --- a/tools/perf/util/evsel.h
    +++ b/tools/perf/util/evsel.h
    @@ -390,6 +390,21 @@ static inline bool perf_evsel__is_bpf_output(struct perf_evsel *evsel)
    (attr->type == PERF_TYPE_SOFTWARE);
    }

    +/**
    + * perf_evsel__is_dummy_tracking - Return whether given evsel is a dummy
    + * event for tracking meta events only
    + *
    + * @evsel - evsel selector to be tested
    + *
    + * Return %true if event is a dummy tracking event
    + */
    +static inline bool perf_evsel__is_dummy_tracking(struct perf_evsel *evsel)
    +{
    + return evsel->attr.type == PERF_TYPE_SOFTWARE &&
    + evsel->attr.config == PERF_COUNT_SW_DUMMY &&
    + evsel->attr.task == 1 && evsel->attr.mmap == 1;
    +}
    +
    struct perf_attr_details {
    bool freq;
    bool verbose;
    --
    2.13.6
    \
     
     \ /
      Last update: 2018-01-14 23:19    [W:2.908 / U:0.084 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site