Date: Thu, 19 Nov 2015 14:00:15 -0500
From: Johannes Weiner <hannes@cmpxchg.org>
To: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@kernel.org>, Tejun Heo <tj@kernel.org>,
        Greg Thelen <gthelen@google.com>, Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>, linux-mm@kvack.org,
        cgroups@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/6] memcg: only account kmem allocations marked as
 __GFP_ACCOUNT
Message-ID: <20151119190015.GC3941@cmpxchg.org>
References: <cover.1447172835.git.vdavydov@virtuozzo.com>
 <14d7a7f5e696d71793ddd835604de309af1963fd.1447172835.git.vdavydov@virtuozzo.com>
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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@virtuozzo.com>

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