From ae4f8ae16a07896403c90305d4b9be27f657c1fc Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Tue, 24 May 2022 10:54:31 +0300 Subject: [PATCH] libperf evlist: Allow mixing per-thread and per-cpu mmaps 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 Acked-by: Ian Rogers Acked-by: Namhyung Kim Cc: Alexey Bayduraev Cc: Jiri Olsa Cc: Leo Yan Link: https://lore.kernel.org/r/20220524075436.29144-11-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/lib/perf/evlist.c | 36 +++++++----------------------------- 1 file changed, 7 insertions(+), 29 deletions(-) diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c index ec0e4b5da874..eae1f6179dad 100644 --- a/tools/lib/perf/evlist.c +++ b/tools/lib/perf/evlist.c @@ -512,29 +512,6 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, 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 mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, struct perf_mmap_param *mp) @@ -565,9 +542,14 @@ static int perf_evlist__nr_mmaps(struct perf_evlist *evlist) { int nr_mmaps; + /* One for each CPU */ nr_mmaps = perf_cpu_map__nr(evlist->all_cpus); - if (perf_cpu_map__empty(evlist->all_cpus)) - nr_mmaps = perf_thread_map__nr(evlist->threads); + if (perf_cpu_map__empty(evlist->all_cpus)) { + /* 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; } @@ -577,7 +559,6 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist, struct perf_mmap_param *mp) { struct perf_evsel *evsel; - const struct perf_cpu_map *cpus = evlist->all_cpus; if (!ops || !ops->get || !ops->mmap) 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) return -ENOMEM; - if (perf_cpu_map__empty(cpus)) - return mmap_per_thread(evlist, ops, mp); - return mmap_per_cpu(evlist, ops, mp); } -- GitLab