From: Peter Zijlstra <peterz@infradead.org>
To: kan.liang@linux.intel.com
Cc: mingo@redhat.com, namhyung@kernel.org, irogers@google.com,
mark.rutland@arm.com, linux-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org, eranian@google.com,
ctshao@google.com, tmricht@linux.ibm.com, leo.yan@arm.com
Subject: Re: [PATCH V4 02/16] perf: Only dump the throttle log for the leader
Date: Wed, 21 May 2025 14:05:41 +0200 [thread overview]
Message-ID: <20250521120541.GD39944@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20250520181644.2673067-3-kan.liang@linux.intel.com>
On Tue, May 20, 2025 at 11:16:30AM -0700, kan.liang@linux.intel.com wrote:
> From: Kan Liang <kan.liang@linux.intel.com>
>
> The PERF_RECORD_THROTTLE records are dumped for all throttled events.
> It's not necessary for group events, which are throttled altogether.
>
> Optimize it by only dump the throttle log for the leader.
>
> The sample right after the THROTTLE record must be generated by the
> actual target event. It is good enough for the perf tool to locate the
> actual target event.
So while both patches change behaviour; the first patch should preserve
all that was done and simply do more. OTOH this patch explicitly changes
behaviour in that what was done, is now no longer done.
Are we very sure there isn't a tool that expect per event throttle
messages?
I'll take the patches, but I'm somewhat suspect of this one.
next prev parent reply other threads:[~2025-05-21 12:05 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-20 18:16 [PATCH V4 00/16] perf: Fix the throttle logic for group kan.liang
2025-05-20 18:16 ` [PATCH V4 01/16] perf: Fix the throttle logic for a group kan.liang
2025-05-20 22:02 ` Namhyung Kim
2025-05-21 12:16 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-27 16:16 ` [PATCH V4 01/16] " Leo Yan
2025-05-27 19:30 ` Liang, Kan
2025-05-28 10:28 ` Leo Yan
2025-05-28 14:51 ` Liang, Kan
2025-06-02 0:30 ` perf regression. Was: " Alexei Starovoitov
2025-06-02 12:55 ` Liang, Kan
2025-06-02 16:24 ` Alexei Starovoitov
2025-06-02 17:51 ` Liang, Kan
2025-06-02 18:14 ` Alexei Starovoitov
2025-05-20 18:16 ` [PATCH V4 02/16] perf: Only dump the throttle log for the leader kan.liang
2025-05-20 22:02 ` Namhyung Kim
2025-05-21 12:05 ` Peter Zijlstra [this message]
2025-05-21 13:55 ` Liang, Kan
2025-05-21 12:16 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 03/16] perf/x86/intel: Remove driver-specific throttle support kan.liang
2025-05-21 12:16 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 04/16] perf/x86/amd: " kan.liang
2025-05-21 12:16 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 05/16] perf/x86/zhaoxin: " kan.liang
2025-05-21 12:16 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 06/16] powerpc/perf: " kan.liang
2025-05-21 12:16 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 07/16] s390/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-07-23 8:06 ` [PATCH V4 07/16] " Sumanth Korikkar
2025-08-06 8:37 ` Sumanth Korikkar
2025-08-06 17:05 ` Liang, Kan
2025-08-11 14:02 ` Sumanth Korikkar
2025-05-20 18:16 ` [PATCH V4 08/16] perf/arm: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 09/16] perf/apple_m1: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 10/16] alpha/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 11/16] arc/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 12/16] csky/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 13/16] loongarch/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 14/16] sparc/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 15/16] xtensa/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
2025-05-20 18:16 ` [PATCH V4 16/16] mips/perf: " kan.liang
2025-05-21 12:15 ` [tip: perf/core] " tip-bot2 for Kan Liang
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