linux-kernel - Re: [PATCH v2] perf parse-events: Make X modifier more respectful of groups

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Message-Id: <176101531311.244304.14298928719214046994.b4-ty@kernel.org>
Date: Tue, 21 Oct 2025 11:55:13 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 Thomas Falcon <thomas.falcon@...el.com>, 
 Dapeng Mi <dapeng1.mi@...ux.intel.com>, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v2] perf parse-events: Make X modifier more respectful
 of groups

On Fri, 17 Oct 2025 16:03:57 -0700, Ian Rogers wrote:

> Events with an X modifier were reordered within a group, for example
> slots was made the leader in:
> ```
> $ perf record -e '{cpu/mem-stores/ppu,cpu/slots/uX}' -- sleep 1
> ```
> 
> Fix by making `dont_regroup` evsels always use their index for
> sorting. Make the cur_leader, when fixing the groups, be that of
> `dont_regroup` evsel so that the `dont_regroup` evsel doesn't become a
> leader.
> 
> [...]

Applied to perf-tools-next, thanks!

Best regards,
Namhyung