linux-kernel - Re: [PATCH 1/3] perf record: Fix per-thread option.

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Date:   Wed, 13 Apr 2022 22:31:11 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexey Bayduraev <alexey.bayduraev@...il.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/3] perf record: Fix per-thread option.

Em Wed, Apr 13, 2022 at 04:42:07AM +0300, Alexey Bayduraev escreveu:
> On 12.04.2022 09:21, Ian Rogers wrote:
> 
> > From: Alexey Bayduraev <alexey.bayduraev@...il.com>
> 
> Thanks,
> 
> The tag
> Signed-off-by: Alexey Bayduraev <alexey.bayduraev@...il.com>
> can be added to this patch.

Thanks, will add that to the cset,

Best regards,

- Arnaldo
 
> Regards,
> Alexey
> 
> > 
> > Per-thread mode doesn't have specific CPUs for events, add checks for
> > this case.
> > 
> > Minor fix to a pr_debug by Ian Rogers <irogers@...gle.com> to avoid an
> > out of bound array access.
> > 
> > Reported-by: Ian Rogers <irogers@...gle.com>
> > Fixes: 7954f71689f9 ("perf record: Introduce thread affinity and mmap masks")
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > ---
> >  tools/perf/builtin-record.c | 22 +++++++++++++++++-----
> >  1 file changed, 17 insertions(+), 5 deletions(-)
> > 
> > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > index ba74fab02e62..069825c48d40 100644
> > --- a/tools/perf/builtin-record.c
> > +++ b/tools/perf/builtin-record.c
> > @@ -989,8 +989,11 @@ static int record__thread_data_init_maps(struct record_thread *thread_data, stru
> >  	struct mmap *overwrite_mmap = evlist->overwrite_mmap;
> >  	struct perf_cpu_map *cpus = evlist->core.user_requested_cpus;
> >  
> > -	thread_data->nr_mmaps = bitmap_weight(thread_data->mask->maps.bits,
> > -					      thread_data->mask->maps.nbits);
> > +	if (cpu_map__is_dummy(cpus))
> > +		thread_data->nr_mmaps = nr_mmaps;
> > +	else
> > +		thread_data->nr_mmaps = bitmap_weight(thread_data->mask->maps.bits,
> > +						      thread_data->mask->maps.nbits);
> >  	if (mmap) {
> >  		thread_data->maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *));
> >  		if (!thread_data->maps)
> > @@ -1007,16 +1010,17 @@ static int record__thread_data_init_maps(struct record_thread *thread_data, stru
> >  		 thread_data->nr_mmaps, thread_data->maps, thread_data->overwrite_maps);
> >  
> >  	for (m = 0, tm = 0; m < nr_mmaps && tm < thread_data->nr_mmaps; m++) {
> > -		if (test_bit(cpus->map[m].cpu, thread_data->mask->maps.bits)) {
> > +		if (cpu_map__is_dummy(cpus) ||
> > +		    test_bit(cpus->map[m].cpu, thread_data->mask->maps.bits)) {
> >  			if (thread_data->maps) {
> >  				thread_data->maps[tm] = &mmap[m];
> >  				pr_debug2("thread_data[%p]: cpu%d: maps[%d] -> mmap[%d]\n",
> > -					  thread_data, cpus->map[m].cpu, tm, m);
> > +					  thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m);
> >  			}
> >  			if (thread_data->overwrite_maps) {
> >  				thread_data->overwrite_maps[tm] = &overwrite_mmap[m];
> >  				pr_debug2("thread_data[%p]: cpu%d: ow_maps[%d] -> ow_mmap[%d]\n",
> > -					  thread_data, cpus->map[m].cpu, tm, m);
> > +					  thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m);
> >  			}
> >  			tm++;
> >  		}
> > @@ -3329,6 +3333,9 @@ static void record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_c
> >  {
> >  	int c;
> >  
> > +	if (cpu_map__is_dummy(cpus))
> > +		return;
> > +
> >  	for (c = 0; c < cpus->nr; c++)
> >  		set_bit(cpus->map[c].cpu, mask->bits);
> >  }
> > @@ -3680,6 +3687,11 @@ static int record__init_thread_masks(struct record *rec)
> >  	if (!record__threads_enabled(rec))
> >  		return record__init_thread_default_masks(rec, cpus);
> >  
> > +	if (cpu_map__is_dummy(cpus)) {
> > +		pr_err("--per-thread option is mutually exclusive to parallel streaming mode.\n");
> > +		return -EINVAL;
> > +	}
> > +
> >  	switch (rec->opts.threads_spec) {
> >  	case THREAD_SPEC__CPU:
> >  		ret = record__init_thread_cpu_masks(rec, cpus);
> > 

-- 

- Arnaldo