linux-kernel - Re: [PATCH v1 1/2] perf arm-spe: Support multiple Arm SPE PMUs

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Date: Tue, 25 Jun 2024 17:49:16 +0100
From: Leo Yan <leo.yan@....com>
To: Ian Rogers <irogers@...gle.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
 James Clark <james.clark@....com>, Suzuki K Poulose
 <suzuki.poulose@....com>, Mike Leach <mike.leach@...aro.org>,
 John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>, Kajol Jain <kjain@...ux.ibm.com>,
 coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] perf arm-spe: Support multiple Arm SPE PMUs

Hi Ian,

On 6/24/24 17:16, Ian Rogers wrote:
> On Sun, Jun 23, 2024 at 6:34 AM Leo Yan <leo.yan@....com> wrote:
>>
>> A platform can have more than one Arm SPE PMU. For example, a system
>> with multiple clusters may have each cluster enabled with its own Arm
>> SPE instance. In such case, the PMU devices will be named 'arm_spe_0',
>> 'arm_spe_1', and so on.
>>
>> Currently, the tool only supports 'arm_spe_0'. This commit extends
>> support to multiple Arm SPE PMUs by detecting the substring 'arm_spe'.
>>
>> Signed-off-by: Leo Yan <leo.yan@....com>
>> ---
>>   tools/perf/arch/arm/util/pmu.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/arch/arm/util/pmu.c b/tools/perf/arch/arm/util/pmu.c
>> index 8b7cb68ba1a8..29cfa1e427ed 100644
>> --- a/tools/perf/arch/arm/util/pmu.c
>> +++ b/tools/perf/arch/arm/util/pmu.c
>> @@ -27,7 +27,7 @@ void perf_pmu__arch_init(struct perf_pmu *pmu __maybe_unused)
>>                  pmu->selectable = true;
>>                  pmu->is_uncore = false;
>>                  pmu->perf_event_attr_init_default = arm_spe_pmu_default_config;
>> -               if (!strcmp(pmu->name, "arm_spe_0"))
>> +               if (strstr(pmu->name, "arm_spe"))
> 
> Why not use strstarts?

Indeed, strstarts() is better, will spin for this.

Thank for suggestion.
Leo