linux-kernel - Re: [PATCH 0/4] perf intel-pt: Fix the pipe mode (v1)

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Date:   Fri, 27 Jan 2023 15:32:35 +0000
From:   James Clark <james.clark@....com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org, Leo Yan <leo.yan@...aro.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/4] perf intel-pt: Fix the pipe mode (v1)



On 27/01/2023 00:19, Namhyung Kim wrote:
> Hello,
> 
> I found some problems in Intel-PT and auxtrace in general with pipe.
> In the past it used to work with pipe, but recent code fails.  As it
> also touches the generic code, other auxtrace users like ARM SPE will
> be affected too.  I added a test case to verify it works with pipes.
> 
> At last, I can run this command without a problem.
> 
>   $ perf record -o- -e intel_pt// true | perf inject -b | perf report -i- --itrace=i1000
> 
> The code is available at 'perf/auxtrace-pipe-v1' branch in
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> 
> Thanks,
> Namhyung
> 
> Namhyung Kim (4):
>   perf inject: Use perf_data__read() for auxtrace
>   perf intel-pt: Do not try to queue auxtrace data on pipe
>   perf session: Avoid calling lseek(2) for pipe
>   perf test: Add pipe mode test to the Intel PT test suite
> 
>  tools/perf/builtin-inject.c             |  6 +++---
>  tools/perf/tests/shell/test_intel_pt.sh | 17 +++++++++++++++++
>  tools/perf/util/auxtrace.c              |  3 +++
>  tools/perf/util/session.c               |  9 +++++++--
>  4 files changed, 30 insertions(+), 5 deletions(-)
> 
> 
For the whole set:

Reviewed-by: James Clark <james.clark@....com>

> base-commit: 5670ebf54bd26482f57a094c53bdc562c106e0a9
> prerequisite-patch-id: 4ccdf9c974a3909075051f4ffe498faecab7567b