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

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Date:	Mon, 17 Mar 2014 11:13:24 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Catalin Marinas <catalin.marinas@....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 2014/3/13 20:14, Catalin Marinas wrote:
> 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).
> 

Sounds reasonable.

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