linux-kernel - Re: [PATCH v3 0/5] NMI warning and debug improvements

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Message-ID: <aBzWSTzjSW97FlBN@x1>
Date: Thu, 8 May 2025 13:05:29 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: "Liang, Kan" <kan.liang@...ux.intel.com>
Cc: Ian Rogers <irogers@...gle.com>, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Howard Chu <howardchu95@...il.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Levi Yun <yeoreum.yun@....com>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Andi Kleen <ak@...ux.intel.com>,
	James Clark <james.clark@...aro.org>,
	Weilin Wang <weilin.wang@...el.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/5] NMI warning and debug improvements

On Wed, Apr 02, 2025 at 04:33:25PM -0400, Liang, Kan wrote:
> 
> 
> On 2025-04-02 4:15 p.m., Ian Rogers wrote:
> > The NMI warning wouldn't fire even if all the events were for one PMU
> > type. Remove a nearby, and no longer useful, mixed hardware event
> > group function. Improve the evlist to string function and dump it in
> > verbose mode after the reordered events warning.
> > 
> > As commonly happens legacy events like instructions will be uniquified
> > to hybrid events like cpu_core/instructions/, even though the
> > encodings differ. To make this correct either:
> > https://lore.kernel.org/lkml/20250312211623.2495798-1-irogers@google.com/
> > or:
> > https://lore.kernel.org/linux-perf-users/20250109222109.567031-1-irogers@google.com/
> > needs merging.
> > 
> > v3: Increase the verbose dump length from 1024 to 2048 as requested by
> >     Kan Liang.
> > 
> > v2: Rename evlist__has_hybrid to evlist__has_hybrid_pmus and add a
> >     max_length parameter to evlist__format_evsels as suggested by Kan
> >     Liang.
> > 
> > Ian Rogers (5):
> >   perf stat: Better hybrid support for the NMI watchdog warning
> >   perf stat: Remove print_mixed_hw_group_error
> >   perf evlist: Refactor evlist__scnprintf_evsels
> >   perf evlist: Add groups to evlist__format_evsels
> >   perf parse-events: Add debug dump of evlist if reordered
> 
> Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>

Thanks, applied to perf-tools-next,

- Arnaldo