linux-kernel - Re: [PATCH v1 1/2] perf auxtrace: Add 'T' itrace option for timestamp trace

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Message-ID: <2940af18-8bcd-4456-a8ed-e77cade1b160@intel.com>
Date:   Tue, 7 Nov 2023 09:19:10 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Leo Yan <leo.yan@...aro.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>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.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 auxtrace: Add 'T' itrace option for timestamp
 trace

On 6/11/23 23:52, Arnaldo Carvalho de Melo wrote:
> Em Thu, Oct 19, 2023 at 01:47:15PM +0300, Adrian Hunter escreveu:
>> On 14/10/23 10:45, Leo Yan wrote:
>>> An AUX trace can contain timestamp, but in some situations, the hardware
>>> trace module (e.g. Arm CoreSight) cannot decide the traced timestamp is
>>> the same source with CPU's time, thus the decoder can not use the
>>> timestamp trace for samples.
>>>
>>> This patch introduces 'T' itrace option. If users know the platforms
>>
>> "If users know" <- how would users know?  Could the kernel
>> or tools also figure it out?
> 
> Adrian, I'm trying to go all the outstanding patches, do you still have
> any issues with this series?

No, although the question wasn't actually answered.  I presume users
just have to try the 'T' option and see if it helps.