Commit f9f16dfb authored Nov 06, 2020 by Leo Yan Committed by Arnaldo Carvalho de Melo Nov 11, 2020

perf mem: Search event name with more flexible path



The perf tool searches a memory event name under the folder
'/sys/devices/cpu/events/', this leads to the limitation for the
selection of a memory profiling event which must be under this folder.

Thus it's impossible to use any other event as memory event which is not
under this specific folder, e.g. Arm SPE hardware event is not located
in '/sys/devices/cpu/events/' so it cannot be enabled for memory
profiling.

This patch changes to search folder from '/sys/devices/cpu/events/' to
'/sys/devices', so it give flexibility to find events which can be used
for memory profiling.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20201106094853.21082-2-leo.yan@linaro.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 644bf4b0

tools/perf/util/mem-events.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -18,8 +18,8 @@ unsigned int perf_mem_events__loads_ldlat = 30;
		#define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }

		struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
		E("ldlat-loads", "cpu/mem-loads,ldlat=%u/P", "mem-loads"),
		E("ldlat-stores", "cpu/mem-stores/P", "mem-stores"),
		E("ldlat-loads", "cpu/mem-loads,ldlat=%u/P", "cpu/events/mem-loads"),
		E("ldlat-stores", "cpu/mem-stores/P", "cpu/events/mem-stores"),
		};
		#undef E

		@@ -93,7 +93,7 @@ int perf_mem_events__init(void)
		struct perf_mem_event *e = &perf_mem_events[j];
		struct stat st;

		scnprintf(path, PATH_MAX, "%s/devices/cpu/events/%s",
		scnprintf(path, PATH_MAX, "%s/devices/%s",
		mnt, e->sysfs_name);

		if (!stat(path, &st))