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libperf evlist: Allow mixing per-thread and per-cpu mmaps

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mmap_per_evsel() will skip events that do not match the CPU, so all CPUs
can be iterated in any case.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20220524075436.29144-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-05-24 10:54:31 +03:00 • committed by Arnaldo Carvalho de Melo
parent 7be1fedd2a
commit ae4f8ae16a
1 changed files with 7 additions and 29 deletions
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36
tools/lib/perf/evlist.c
View file

@ -512,29 +512,6 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
return 0; return 0;
} }
static int
mmap_per_thread(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
struct perf_mmap_param *mp)
{
int thread;
int nr_threads = perf_thread_map__nr(evlist->threads);
for (thread = 0; thread < nr_threads; thread++) {
int output = -1;
int output_overwrite = -1;
if (mmap_per_evsel(evlist, ops, thread, mp, 0, thread,
&output, &output_overwrite))
goto out_unmap;
}
return 0;
out_unmap:
perf_evlist__munmap(evlist);
return -1;
}
static int static int
mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
struct perf_mmap_param *mp) struct perf_mmap_param *mp)
@ -565,9 +542,14 @@ static int perf_evlist__nr_mmaps(struct perf_evlist *evlist)
{ {
int nr_mmaps; int nr_mmaps;
/* One for each CPU */
nr_mmaps = perf_cpu_map__nr(evlist->all_cpus); nr_mmaps = perf_cpu_map__nr(evlist->all_cpus);
if (perf_cpu_map__empty(evlist->all_cpus)) if (perf_cpu_map__empty(evlist->all_cpus)) {
nr_mmaps = perf_thread_map__nr(evlist->threads); /* Plus one for each thread */
nr_mmaps += perf_thread_map__nr(evlist->threads);
/* Minus the per-thread CPU (-1) */
nr_mmaps -= 1;
}
return nr_mmaps; return nr_mmaps;
} }
@ -577,7 +559,6 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
struct perf_mmap_param *mp) struct perf_mmap_param *mp)
{ {
struct perf_evsel *evsel; struct perf_evsel *evsel;
const struct perf_cpu_map *cpus = evlist->all_cpus;
if (!ops || !ops->get || !ops->mmap) if (!ops || !ops->get || !ops->mmap)
return -EINVAL; return -EINVAL;
@ -596,9 +577,6 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0) if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
return -ENOMEM; return -ENOMEM;
if (perf_cpu_map__empty(cpus))
return mmap_per_thread(evlist, ops, mp);
return mmap_per_cpu(evlist, ops, mp); return mmap_per_cpu(evlist, ops, mp);
} }