linux-kernel - Re: [PATCH 1/3] kmemleak: allow freeing internal objects after disabling kmemleak

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Message-ID: <20140313121459.GJ30339@arm.com>
Date:	Thu, 13 Mar 2014 12:14:59 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 1/3] kmemleak: allow freeing internal objects after
 disabling kmemleak

On Thu, Mar 13, 2014 at 06:47:46AM +0000, Li Zefan wrote:
> +Freeing kmemleak internal objects
> +---------------------------------
> +
> +To allow access to previosuly found memory leaks even when an error fatal
> +to kmemleak happens, internal kmemleak objects won't be freed when kmemleak
> +is disabled, and those objects may occupy a large part of physical
> +memory.
> +
> +If you want to make sure they're freed before disabling kmemleak:
> +
> +  # echo scan=off > /sys/kernel/debug/kmemleak
> +  # echo off > /sys/kernel/debug/kmemleak

I would actually change the code to do a stop_scan_thread() as part of
the "off" handling so that scan=off is not required (we can't put it as
part of the kmemleak_disable because we need scan_mutex held).

-- 
Catalin
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