linux-kernel - Re: [PATCH v2 3/6] memcg: only account kmem allocations marked as __GFP

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Message-ID: <20151119190015.GC3941@cmpxchg.org>
Date:	Thu, 19 Nov 2015 14:00:15 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...nel.org>, Tejun Heo <tj@...nel.org>,
	Greg Thelen <gthelen@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] memcg: only account kmem allocations marked as
 __GFP_ACCOUNT

On Tue, Nov 10, 2015 at 09:34:04PM +0300, Vladimir Davydov wrote:
> Black-list kmem accounting policy (aka __GFP_NOACCOUNT) turned out to be
> fragile and difficult to maintain, because there seem to be many more
> allocations that should not be accounted than those that should be.
> Besides, false accounting an allocation might result in much worse
> consequences than not accounting at all, namely increased memory
> consumption due to pinned dead kmem caches.
> 
> So this patch switches kmem accounting to the white-policy: now only
> those kmem allocations that are marked as __GFP_ACCOUNT are accounted to
> memcg. Currently, no kmem allocations are marked like this. The
> following patches will mark several kmem allocations that are known to
> be easily triggered from userspace and therefore should be accounted to
> memcg.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>
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