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| author |   Kyle Meyer <meyerk@hpe.com> | 2019-08-27 16:43:52 -0500 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-08-29 17:38:32 -0300 |
| commit | df552793493ff83b2b7289389d29d417b3ef6d6d (patch) | |
| tree | 10cfc2367dad619e22ca34864980a70a28e0d557 /tools/perf/lib | |
| parent | perf header: Replace MAX_NR_CPUS with cpu__max_cpu() (diff) | |
| download | wireguard-linux-df552793493ff83b2b7289389d29d417b3ef6d6d.tar.xz wireguard-linux-df552793493ff83b2b7289389d29d417b3ef6d6d.zip | |
libperf: Warn when exceeding MAX_NR_CPUS in cpumap
Display a warning when attempting to profile more than MAX_NR_CPU CPUs.
This patch should not change any behavior.
Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Link: http://lore.kernel.org/lkml/20190827214352.94272-8-meyerk@stormcage.eag.rdlabs.hpecorp.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/lib')
| -rw-r--r-- | tools/perf/lib/cpumap.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/lib/cpumap.c b/tools/perf/lib/cpumap.c index 2834753576b2..1f0e6f334237 100644 --- a/tools/perf/lib/cpumap.c +++ b/tools/perf/lib/cpumap.c @@ -100,6 +100,9 @@ struct perf_cpu_map *perf_cpu_map__read(FILE *file) if (prev >= 0) { int new_max = nr_cpus + cpu - prev - 1; + WARN_ONCE(new_max >= MAX_NR_CPUS, "Perf can support %d CPUs. " + "Consider raising MAX_NR_CPUS\n", MAX_NR_CPUS); + if (new_max >= max_entries) { max_entries = new_max + MAX_NR_CPUS / 2; tmp = realloc(tmp_cpus, max_entries * sizeof(int)); @@ -192,6 +195,9 @@ struct perf_cpu_map *perf_cpu_map__new(const char *cpu_list) end_cpu = start_cpu; } + WARN_ONCE(end_cpu >= MAX_NR_CPUS, "Perf can support %d CPUs. " + "Consider raising MAX_NR_CPUS\n", MAX_NR_CPUS); + for (; start_cpu <= end_cpu; start_cpu++) { /* check for duplicates */ for (i = 0; i < nr_cpus; i++) |