linux-kernel - Re: [PATCH v3 4/4] tools/perf: Allow inherit + inherit_stat + PERF_SAMPLE

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Date: Fri, 22 Mar 2024 14:18:54 +0000
From: Ben Gainey <Ben.Gainey@....com>
To: "namhyung@...nel.org" <namhyung@...nel.org>, "peterz@...radead.org"
	<peterz@...radead.org>, "mingo@...hat.com" <mingo@...hat.com>,
	"acme@...nel.org" <acme@...nel.org>
CC: "alexander.shishkin@...ux.intel.com" <alexander.shishkin@...ux.intel.com>,
	Mark Rutland <Mark.Rutland@....com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, James Clark <James.Clark@....com>,
	"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
	"linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
	"jolsa@...nel.org" <jolsa@...nel.org>, "irogers@...gle.com"
	<irogers@...gle.com>
Subject: Re: [PATCH v3 4/4] tools/perf: Allow inherit + inherit_stat +
 PERF_SAMPLE_READ when opening events

On Fri, 2024-03-22 at 13:04 +0000, Ben Gainey wrote:
> This change updates evsel to allow the combination of inherit
> and PERF_SAMPLE_READ.
>
> A fallback is implemented for kernel versions where this feature is
> not
> supported.
>
> The user must pass --stat option to perf record to opt into this new
> behaviour.
>
> Signed-off-by: Ben Gainey <ben.gainey@....com>
> ---
>  tools/perf/tests/attr/base-record             |  2 +-
>  tools/perf/tests/attr/base-stat               |  2 +-
>  tools/perf/tests/attr/system-wide-dummy       |  2 +-
>  tools/perf/tests/attr/test-record-dummy-C0    |  2 +-
>  .../test-record-group-sampling-inherit-stat   | 62 ++++++++++++++
>  tools/perf/util/evsel.c                       | 82
> ++++++++++++++++++-
>  tools/perf/util/evsel.h                       |  1 +
>  7 files changed, 147 insertions(+), 6 deletions(-)
>  create mode 100644 tools/perf/tests/attr/test-record-group-sampling-
> inherit-stat
>
> diff --git a/tools/perf/tests/attr/base-record
> b/tools/perf/tests/attr/base-record
> index b44e4e6e4443..dd76fbdb628f 100644
> --- a/tools/perf/tests/attr/base-record
> +++ b/tools/perf/tests/attr/base-record
> @@ -5,7 +5,7 @@ group_fd=-1
>  flags=0|8
>  cpu=*
>  type=0|1
> -size=136
> +size=144

Sigh... this one belongs elsewhere. Too many spinning plates.

I'll have to redo this one with the correct size= value.

Regards
Ben
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