linux-kernel - Re: [PATCH 0/4] perf intel-pt: Fix the pipe mode (v2)

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Date:   Tue, 31 Jan 2023 18:10:09 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
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,
        James Clark <james.clark@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/4] perf intel-pt: Fix the pipe mode (v2)

On 31/01/23 04:33, 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.
> 
> Changes in v2)
>  * add a warning in intel_pt_process_auxtrace_info()
>  * add Reviewed-by from James

Minor changes suggested for patch 2, otherwise:

Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

> 
> 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-v2' 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/Documentation/perf-intel-pt.txt | 30 ++++++++++++++++++++++
>  tools/perf/builtin-inject.c                |  6 ++---
>  tools/perf/tests/shell/test_intel_pt.sh    | 17 ++++++++++++
>  tools/perf/util/auxtrace.c                 |  3 +++
>  tools/perf/util/intel-pt.c                 |  6 +++++
>  tools/perf/util/session.c                  |  9 +++++--
>  6 files changed, 66 insertions(+), 5 deletions(-)
> 
> 
> base-commit: 5670ebf54bd26482f57a094c53bdc562c106e0a9