From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
linux-perf-users@vger.kernel.org, agordeev@linux.ibm.com,
gor@linux.ibm.com, sumanthk@linux.ibm.com, hca@linux.ibm.com,
japo@linux.ibm.com
Subject: Re: [PATCH v2] perf symbol: Remove psw_idle() from list of idle symbols
Date: Mon, 2 Mar 2026 15:43:43 -0300 [thread overview]
Message-ID: <aaXaX676sTLCX_LG@x1> (raw)
In-Reply-To: <aZzKrRB0__RahFJV@google.com>
On Mon, Feb 23, 2026 at 01:46:21PM -0800, Namhyung Kim wrote:
> On Thu, Feb 19, 2026 at 12:38:50PM +0100, Thomas Richter wrote:
> > Commit fa2ae4a377c0 ("s390/idle: Rewrite psw_idle() in C")
> >
> > removes symbols psw_idle() and psw_idle_exit() from the linux
> > kernel for s390. Remove them in perf tool's list of idle
> > functions. They can not be detected anymore.
>
> But I think old kernels may still run somewhere. It seems the above
> commit was merged to v6.10. Maybe we should wait some more time before
> removing it in the tool.
Agreed, using a new perf tool, say built from the tarballs made
available at:
https://www.kernel.org/pub/linux/kernel/tools/perf/v7.0.0/perf-7.0.0-rc1.tar.xz
(I will not make a rc2 available since there are no changes to the
tools/perf codebase in this rc).
On older kernels should still ignore those functions.
A suggestion for work in this area instead is to get those samples into
a special bucket, the "idle" one, and show it at some place in the
screen.
Thanks,
- Arnaldo
next prev parent reply other threads:[~2026-03-02 18:43 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-19 11:38 [PATCH v2] perf symbol: Remove psw_idle() from list of idle symbols Thomas Richter
2026-02-19 11:55 ` Jan Polensky
2026-02-23 21:46 ` Namhyung Kim
2026-02-23 23:14 ` Arnaldo Melo
2026-03-02 18:43 ` Arnaldo Carvalho de Melo [this message]
2026-03-02 19:44 ` Ian Rogers
2026-03-04 14:34 ` Arnaldo Carvalho de Melo
2026-03-02 23:43 ` [PATCH v1] perf symbol: Lazily compute idle and use the perf_env Ian Rogers
2026-03-24 17:14 ` Ian Rogers
2026-03-25 6:58 ` Namhyung Kim
2026-03-25 15:58 ` Ian Rogers
2026-03-25 16:18 ` [PATCH v2] " Ian Rogers
2026-03-26 7:20 ` Honglei Wang
2026-03-26 15:11 ` Ian Rogers
2026-03-26 17:45 ` [PATCH v3 0/2] perf symbol/env: ELF machine clean up and lazy idle computation Ian Rogers
2026-03-26 17:45 ` [PATCH v3 1/2] perf env: Add perf_env__e_machine helper and use in perf_env__arch Ian Rogers
2026-03-26 17:45 ` [PATCH v3 2/2] perf symbol: Lazily compute idle and use the perf_env Ian Rogers
2026-03-27 6:56 ` Honglei Wang
2026-03-27 4:50 ` [PATCH v4 0/2] perf symbol/env: ELF machine clean up and lazy idle computation Ian Rogers
2026-03-27 4:50 ` [PATCH v4 1/2] perf env: Add perf_env__e_machine helper and use in perf_env__arch Ian Rogers
2026-03-27 4:50 ` [PATCH v4 2/2] perf symbol: Lazily compute idle and use the perf_env Ian Rogers
2026-03-27 6:00 ` [PATCH v2] perf tests task-analyzer: Write test files to tmpdir Ian Rogers
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