linux-kernel - Re: [PATCH v4 19/25] memcg: disable kmem code when not in use.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FDF1E89.2020007@parallels.com>
Date:	Mon, 18 Jun 2012 16:26:49 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	<linux-mm@...ck.org>, Pekka Enberg <penberg@...nel.org>,
	Cristoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	<cgroups@...r.kernel.org>, <devel@...nvz.org>,
	<linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v4 19/25] memcg: disable kmem code when not in use.

>>
>>    static void drain_all_stock_async(struct mem_cgroup *memcg);
>> @@ -4344,8 +4358,13 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
>>    			 *
>>    			 * But it is not worth the trouble
>>    			 */
>> -			if (!memcg->kmem_accounted&&  val != RESOURCE_MAX)
>> +			mutex_lock(&set_limit_mutex);
>> +			if (!memcg->kmem_accounted&&  val != RESOURCE_MAX
>> +			&&  !memcg->kmem_accounted) {
> 
> I'm sorry why you check the value twice ?
> 

Hi Kame,

For no reason, it should be removed. I never noticed this because 1)
This is the kind of thing testing will never reveal, and 2), this
actually goes away in a later patch (memcg: propagate kmem limiting
information to children)

In any case, I will update my tree here.

Thanks for spotting this

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/