libperf: Warn when exceeding MAX_NR_CPUS in cpumap (df552793) · Commits · 戴 / test

Display a warning when attempting to profile more than MAX_NR_CPU CPUs. This patch should not change any behavior. Signed-off-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:

tools/perf/lib/cpumap.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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++)