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perf mem: Warn if memory events are not supported on all CPUs

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It is possible that memory events are not supported on all CPUs.

Prints a warning by dumping the enabled CPU maps in this case.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: John Garry <john.g.garry@oracle.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: coresight@lists.linaro.org
Link: https://lore.kernel.org/r/20240706152035.86983-3-leo.yan@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Leo Yan 2024-07-06 16:20:35 +01:00 committed by Namhyung Kim
parent e6b4da6759
commit 14b0fffa25
1 changed files with 14 additions and 0 deletions
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14
tools/perf/util/mem-events.c
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@ -8,6 +8,7 @@
#include <unistd.h>
#include <api/fs/fs.h>
#include <linux/kernel.h>
#include "cpumap.h"
#include "map_symbol.h"
#include "mem-events.h"
#include "mem-info.h"
@ -242,6 +243,7 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr)
int i = *argv_nr;
const char *s;
char *copy;
struct perf_cpu_map *cpu_map = NULL;
while ((pmu = perf_pmus__scan_mem(pmu)) != NULL) {
for (int j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
@ -266,9 +268,21 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr)
rec_argv[i++] = "-e";
rec_argv[i++] = copy;
cpu_map = perf_cpu_map__merge(cpu_map, pmu->cpus);
}
}
if (cpu_map) {
if (!perf_cpu_map__equal(cpu_map, cpu_map__online())) {
char buf[200];
cpu_map__snprint(cpu_map, buf, sizeof(buf));
pr_warning("Memory events are enabled on a subset of CPUs: %s\n", buf);
}
perf_cpu_map__put(cpu_map);
}
*argv_nr = i;
return 0;
}