linux-kernel - Re: [RFC] perf arm-spe: Track task context switch for cpu-mode events

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Message-ID: <0bcb26fb-f04d-7ba7-1118-37022466ccc5@arm.com>
Date:   Mon, 1 Nov 2021 15:42:50 +0000
From:   German Gomez <german.gomez@....com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [RFC] perf arm-spe: Track task context switch for cpu-mode events


On 01/11/2021 15:36, German Gomez wrote:
> [...]
> Not really. It will only peek at the first decoded packet without

Slight correction for clarity: s/decoded packet/decoded record/. I would
be peeking at the first record in the auxtrace queue. The context packet
is stored in the context_id field of the record.

> dropping it. I couldn't think of a corner case where the decoder might
> miss a context packet for the first records (I also haven't seen any -1
> values so far).
>