Date: Wed, 11 Nov 2015 10:54:50 -0500
From: Tejun Heo <tj@kernel.org>
To: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@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 4/6] slab: add SLAB_ACCOUNT flag
Message-ID: <20151111155450.GB6246@mtj.duckdns.org>
References: <cover.1447172835.git.vdavydov@virtuozzo.com>
 <1ce23e932ea53f47a3376de90b21a9db8293bd6c.1447172835.git.vdavydov@virtuozzo.com>
 <20151110183808.GB13740@mtj.duckdns.org>
 <20151110185401.GW31308@esperanza>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20151110185401.GW31308@esperanza>
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 973
Lines: 25

Hello,

On Tue, Nov 10, 2015 at 09:54:01PM +0300, Vladimir Davydov wrote:
> > Am I correct in thinking that we should eventually be able to removed
> > __GFP_ACCOUNT and that only caches explicitly marked with SLAB_ACCOUNT
> > would need to be handled by kmemcg?
> 
> Don't think so, because sometimes we want to account kmalloc.

I'm kinda skeptical about that because if those allocations are
occassional by nature, we don't care and if there can be a huge number
of them, splitting them into a separate cache makes sense.  I think it
makes sense to pin down exactly which caches are memcg managed.  That
has the potential to simplify the involved code path and shave off a
small bit of hot path overhead.

Thanks.

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