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perf tools: No need to cache the PMUs in ARM SPE auxtrace init routine

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- auxtrace_record__init() is called only once, so there is no point in
  using a static variable to cache the results of
  find_all_arm_spe_pmus(), make it local and free the results after use.

- Another reason is, even though SPE is micro-architecture dependent,
  but so far it only supports "statistical-profiling-extension-v1" and
  we have no chance to use multiple SPE's PMU events in Perf command.

So remove the useless check code to make it clear.

Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kim Phillips <kim.phillips@arm.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lore.kernel.org/lkml/20200724071111.35593-3-liwei391@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wei Li 2020-07-24 15:11:11 +08:00 committed by Arnaldo Carvalho de Melo
parent 31e81e0bed
commit 3e43d79da1
1 changed files with 4 additions and 5 deletions
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9
tools/perf/arch/arm/util/auxtrace.c
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@ -57,17 +57,15 @@ struct auxtrace_record
struct evsel *evsel;
bool found_etm = false;
struct perf_pmu *found_spe = NULL;
static struct perf_pmu **arm_spe_pmus = NULL;
static int nr_spes = 0;
struct perf_pmu **arm_spe_pmus = NULL;
int nr_spes = 0;
int i = 0;
if (!evlist)
return NULL;
cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
if (!arm_spe_pmus)
arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
evlist__for_each_entry(evlist, evsel) {
if (cs_etm_pmu &&
@ -84,6 +82,7 @@ struct auxtrace_record
}
}
}
free(arm_spe_pmus);
if (found_etm && found_spe) {
pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n");