linux-kernel - Re: [PATCH v3 3/3] mm: kmemleak: Use the memory pool for early allocations

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Date:   Tue, 13 Aug 2019 14:49:07 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Qian Cai <cai@....pw>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v3 3/3] mm: kmemleak: Use the memory pool for early
 allocations

On Tue, Aug 13, 2019 at 08:35:54AM -0400, Qian Cai wrote:
> On Mon, 2019-08-12 at 17:06 +0100, Catalin Marinas wrote:
> > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > index 4d39540011e2..39df06ffd9f4 100644
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -592,17 +592,18 @@ config DEBUG_KMEMLEAK
> >  	  In order to access the kmemleak file, debugfs needs to be
> >  	  mounted (usually at /sys/kernel/debug).
> >  
> > -config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
> > -	int "Maximum kmemleak early log entries"
> > +config DEBUG_KMEMLEAK_MEM_POOL_SIZE
> > +	int "Kmemleak memory pool size"
> >  	depends on DEBUG_KMEMLEAK
> >  	range 200 40000
> >  	default 16000
> 
> Hmm, this seems way too small. My previous round of testing with
> kmemleak.mempool=524288 works quite well on all architectures.

We can change the upper bound here to 1M but I'd keep the default sane.
Not everyone is running tests under OOM.

-- 
Catalin