linux-kernel - Re: [PATCH] perf arm-spe: Use advertised caps/min_interval as default sample

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Date:   Wed, 23 Feb 2022 09:14:36 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     German Gomez <german.gomez@....com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org, John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] perf arm-spe: Use advertised caps/min_interval as
 default sample_period

On Mon, Feb 21, 2022 at 05:10:42PM +0000, German Gomez wrote:
> When recording SPE traces, the default sample_period is currently being
> set to 1 in the perf_event_attr fields, instead of the value advertised
> in '/sys/devices/arm_spe_0/caps/min_interval':
> 
> Before:
> 
> $ perf record -e arm_spe// -vv -- sleep 1
> [...]
>   { sample_period, sample_freq }   1
> [...]
> 
> Use the value from the above sysfs location as a more sensible default
> (it was already being read, but the value not being used)
> 
> After:
> 
> $ perf record -e arm_spe// -vv -- sleep 1
> [...]
>   { sample_period, sample_freq }   1024
> [...]
> 
> Signed-off-by: German Gomez <german.gomez@....com>

The change looks good to me:

Reviewed-by: Leo Yan <leo.yan@...aro.org>