linux-kernel - Re: [PATCH] perf lock contention: Load kernel map before lookup

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Message-Id: <176219241263.1981113.9281236237114360261.b4-ty@kernel.org>
Date: Mon, 03 Nov 2025 09:53:32 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 James Clark <james.clark@...aro.org>, Peter Zijlstra <peterz@...radead.org>, 
 Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
 linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf lock contention: Load kernel map before lookup

On Wed, 29 Oct 2025 21:01:39 -0700, Namhyung Kim wrote:
> On some machines, it caused troubles when it tried to find kernel
> symbols.  I think it's because kernel modules and kallsyms are messed
> up during load and split.
> 
> Basically we want to make sure the kernel map is loaded and the code has
> it in the lock_contention_read().  But recently we added more lookups in
> the lock_contention_prepare() which is called before _read().
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung