linux-kernel - [PATCH v6 0/2] Minor fixes error handling of perf stat

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Message-Id: <20240925132022.2650180-1-yeoreum.yun@arm.com>
Date: Wed, 25 Sep 2024 14:20:20 +0100
From: Levi Yun <yeoreum.yun@....com>
To: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	mark.rutland@....com,
	alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	james.clark@...aro.org,
	howardchu95@...il.com
Cc: nd@....com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Levi Yun <yeoreum.yun@....com>
Subject: [PATCH v6 0/2] Minor fixes error handling of perf stat

This patchset fixes two issues that were seen when running
  "perf stat -r" with perf_event_paranoid=3

   1. failed with Too many open files.
     $ perf stat -r 1044 -- false
     ...
     failed to create 'go' pipe: Too many open files
     failed to prepare workload: Too many open files
     ...

   2. repating error message
     $ perf stat -r 1044 -- false
     Error:
     Access to performance monitoring and observability operations is limited.
     ...
     (repating with same error message 1044 times).
v6:
  - check cork_fd with >= 0

v5:
  - add error handling label.

v4:
  - Move comments to run_perf_stat().

v3:
  - Fix comments.

v2:
  - Add some comments.

Levi Yun (2):
  perf stat: Close cork_fd when create_perf_stat_counter() failed
  perf stat: Stop repeating when ref_perf_stat() returns -1

 tools/perf/builtin-stat.c | 11 ++++++++++-
 tools/perf/util/evlist.c  | 14 +++++++++++++-
 tools/perf/util/evlist.h  |  1 +
 3 files changed, 24 insertions(+), 2 deletions(-)

--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}