linux-kernel - Re: [PATCH v4] kmemleak: survive in a low-memory situation

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Message-ID: <1553786687.26196.26.camel@lca.pw>
Date:   Thu, 28 Mar 2019 11:24:47 -0400
From:   Qian Cai <cai@....pw>
To:     Catalin Marinas <catalin.marinas@....com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Michal Hocko <mhocko@...nel.org>, akpm@...ux-foundation.org,
        cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] kmemleak: survive in a low-memory situation

On Thu, 2019-03-28 at 14:59 +0000, Catalin Marinas wrote:		2
> +/* minimum memory pool sizes */
> +#define MIN_OBJECT_POOL		(NR_CPUS * 4)
> +#define MIN_SCAN_AREA_POOL	(NR_CPUS * 1)

I am thinking about making those are tunable, so people could have a big pool
depends on their workloads.

Also, I would like to see a way to refill this emergency pool. For example, once
OOM kiler freed up more memory. Maybe at the time of kmemleak_scan kthread
kicked in and then monitor and refill the pool whenever possible.