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    Subject[PATCH V3 6/6] perf record: add option to set the number of thread for event synthesize
    Date
    From: Kan Liang <Kan.liang@intel.com>

    Using UINT_MAX to indicate the default thread#, which is the number of
    online CPU.

    Signed-off-by: Kan Liang <Kan.liang@intel.com>
    ---
    tools/perf/Documentation/perf-record.txt | 4 ++++
    tools/perf/builtin-record.c | 10 +++++++++-
    2 files changed, 13 insertions(+), 1 deletion(-)

    diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
    index 68a1ffb..f759dc4 100644
    --- a/tools/perf/Documentation/perf-record.txt
    +++ b/tools/perf/Documentation/perf-record.txt
    @@ -483,6 +483,10 @@ config terms. For example: 'cycles/overwrite/' and 'instructions/no-overwrite/'.

    Implies --tail-synthesize.

    +--num-thread-synthesize::
    +The number of threads to run event synthesize.
    +By default, the number of threads equals to the online CPU number.
    +
    SEE ALSO
    --------
    linkperf:perf-stat[1], linkperf:perf-list[1]
    diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
    index 283fc21..4b65ebd 100644
    --- a/tools/perf/builtin-record.c
    +++ b/tools/perf/builtin-record.c
    @@ -82,6 +82,7 @@ struct record {
    struct switch_output switch_output;
    unsigned long long samples;
    struct perf_data_file *synthesized_file;
    + unsigned int nr_threads_synthesize;
    };

    static volatile int auxtrace_record__snapshot_started;
    @@ -707,10 +708,14 @@ static int record__multithread_synthesize(struct record *rec,
    struct perf_tool *tool,
    struct record_opts *opts)
    {
    - int i, j, err, nr_thread = sysconf(_SC_NPROCESSORS_ONLN);
    + int i, j, err, nr_thread;
    int fd_from, fd_to;
    struct stat st;

    + if (rec->nr_threads_synthesize == UINT_MAX)
    + nr_thread = sysconf(_SC_NPROCESSORS_ONLN);
    + else
    + nr_thread = rec->nr_threads_synthesize;
    again:
    /* multithreading synthesize is only available for cpu monitoring */
    if (target__has_task(&opts->target) || (nr_thread <= 1))
    @@ -1530,6 +1535,7 @@ static struct record record = {
    .mmap2 = perf_event__process_mmap2,
    .ordered_events = true,
    },
    + .nr_threads_synthesize = UINT_MAX,
    };

    const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
    @@ -1671,6 +1677,8 @@ static struct option __record_options[] = {
    "signal"),
    OPT_BOOLEAN(0, "dry-run", &dry_run,
    "Parse options then exit"),
    + OPT_UINTEGER(0, "num-thread-synthesize", &record.nr_threads_synthesize,
    + "number of thread to run event synthesize"),
    OPT_END()
    };

    --
    2.7.4
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