linux-kernel - Re: [PATCH v4 0/2] Minor fixes error handling of perf stat

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Message-ID:
 <GV1PR08MB10521B7D2A65ACA5CBD252655FB682@GV1PR08MB10521.eurprd08.prod.outlook.com>
Date: Tue, 24 Sep 2024 07:13:21 +0000
From: Yeo Reum Yun <YeoReum.Yun@....com>
To: "peterz@...radead.org" <peterz@...radead.org>, "mingo@...hat.com"
	<mingo@...hat.com>, "acme@...nel.org" <acme@...nel.org>,
	"namhyung@...nel.org" <namhyung@...nel.org>, Mark Rutland
	<Mark.Rutland@....com>, "alexander.shishkin@...ux.intel.com"
	<alexander.shishkin@...ux.intel.com>, "jolsa@...nel.org" <jolsa@...nel.org>,
	"irogers@...gle.com" <irogers@...gle.com>, "james.clark@...aro.org"
	<james.clark@...aro.org>, "asmadeus@...ewreck.org" <asmadeus@...ewreck.org>
CC: "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, nd
	<nd@....com>
Subject: Re: [PATCH v4 0/2] Minor fixes error handling of perf stat

Gentle ping.

________________________________________
From: Levi Yun <yeoreum.yun@....com>
Sent: 13 September 2024 14:59
To: peterz@...radead.org; mingo@...hat.com; acme@...nel.org; namhyung@...nel.org; Mark Rutland; alexander.shishkin@...ux.intel.com; jolsa@...nel.org; irogers@...gle.com; james.clark@...aro.org; asmadeus@...ewreck.org
Cc: linux-perf-users@...r.kernel.org; linux-kernel@...r.kernel.org; nd; Yeo Reum Yun
Subject: [PATCH v4 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).

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}