Messages in this thread | | | Date | Mon, 17 Sep 2018 20:37:16 +0900 | From | Namhyung Kim <> | Subject | Re: [PATCH 44/48] perf record: Add --threads option |
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On Thu, Sep 13, 2018 at 02:54:46PM +0200, Jiri Olsa wrote: > Allows to assign number to record::threads_cnt and thus > to create multiple threads. At this point we don't allow > to specify number of threads, instead we assign it number > of evlist's mmaps to have a single thread for each. > > Link: http://lkml.kernel.org/n/tip-ijl786fsk46q6g01is378a5t@git.kernel.org > Signed-off-by: Jiri Olsa <jolsa@kernel.org> > --- > tools/perf/builtin-record.c | 36 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 36 insertions(+) > > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c > index fbca1d15b90d..ada6f795d492 100644 > --- a/tools/perf/builtin-record.c > +++ b/tools/perf/builtin-record.c > @@ -102,6 +102,7 @@ struct record { > unsigned long long samples; > struct record_thread *threads; > int threads_cnt; > + bool threads_set; > int threads_signal_cnt; > pthread_mutex_t threads_signal_mutex; > pthread_cond_t threads_signal_cond; > @@ -1133,11 +1134,38 @@ record__threads_create(struct record *rec) > return threads ? 0 : -ENOMEM; > } > > +static int record__threads_cnt(struct record *rec) > +{ > + struct perf_evlist *evlist = rec->evlist; > + int cnt; > + > + if (rec->threads_set) { > + if (rec->threads_cnt) { > + pr_err("failed: Can't specify number of threads yet.\n"); > + return -EINVAL; > + } > + if (evlist->overwrite_mmap) { > + pr_err("failed: Can't use multiple threads with overwrite mmaps yet.\n"); > + return -EINVAL;
Ah, ok. You made it incompatible with the overwrite mode..
Thanks, Namhyung
> + } > + cnt = evlist->nr_mmaps; > + } else { > + cnt = 1; > + } > + > + rec->threads_cnt = cnt; > + return 0; > +} > + > static int > record__threads_config(struct record *rec) > { > int ret; > > + ret = record__threads_cnt(rec); > + if (ret) > + goto out; > + > ret = record__threads_create(rec); > if (ret) > goto out; > @@ -2119,6 +2147,8 @@ static struct option __record_options[] = { > "Parse options then exit"), > OPT_BOOLEAN(0, "index", &record.opts.index, > "make index for sample data to speed-up processing"), > + OPT_INTEGER_OPTARG_SET(0, "threads", &record.threads_cnt, &record.threads_set, > + "count", "Enabled threads (count)", 0), > OPT_END() > }; > > @@ -2267,6 +2297,12 @@ int cmd_record(int argc, const char **argv) > goto out; > } > > + /* > + * Threads need index data file. > + */ > + if (record.threads_set) > + record.opts.index = true; > + > if (rec->opts.index) { > if (!rec->opts.sample_time) { > pr_err("Sample timestamp is required for indexing\n"); > -- > 2.17.1 >
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