linux-kernel - Re: [PATCH v3] sched_ext: Use kvzalloc for large exit

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Message-ID: <Z_Vit8V1J2rCrlRC@slm.duckdns.org>
Date: Tue, 8 Apr 2025 07:53:59 -1000
From: Tejun Heo <tj@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: David Vernet <void@...ifault.com>, Andrea Righi <arighi@...dia.com>,
	Changwoo Min <changwoo@...lia.com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org, christophe.jaillet@...adoo.fr,
	stable@...r.kernel.org, Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH v3] sched_ext: Use kvzalloc for large exit_dump allocation

On Tue, Apr 08, 2025 at 09:50:42AM -0700, Breno Leitao wrote:
> Replace kzalloc with kvzalloc for the exit_dump buffer allocation, which
> can require large contiguous memory depending on the implementation.
> This change prevents allocation failures by allowing the system to fall
> back to vmalloc when contiguous memory allocation fails.
> 
> Since this buffer is only used for debugging purposes, physical memory
> contiguity is not required, making vmalloc a suitable alternative.
> 
> Cc: stable@...r.kernel.org
> Fixes: 07814a9439a3b0 ("sched_ext: Print debug dump after an error exit")
> Suggested-by: Rik van Riel <riel@...riel.com>
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> Acked-by: Andrea Righi <arighi@...dia.com>

Applied to sched_ext/for-6.15-fixes.

Thanks.

-- 
tejun