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

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Date:   Mon, 30 Jan 2023 18:33:46 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     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,
        James Clark <james.clark@....com>,
        Leo Yan <leo.yan@...aro.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 0/4] perf intel-pt: Fix the pipe mode (v2)

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

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
-- 
2.39.1.456.gfc5497dd1b-goog