linux-kernel - Re: [PATCH v2 4/6] slab: add SLAB

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Date:	Wed, 11 Nov 2015 19:07:19 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...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 4/6] slab: add SLAB_ACCOUNT flag

On Wed, Nov 11, 2015 at 10:54:50AM -0500, Tejun Heo wrote:
> 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.

What about external_name allocation in __d_alloc? Is it occasional?
Depends on the workload I guess. Can we create a separate cache for it?
No, because its size is variable. There are other things like that, e.g.
pipe_buffer array.

Thanks,
Vladimir
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