linux-kernel - Re: [PATCH RFC 3/3] slub: reparent memcg caches' slabs on memcg offline

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Message-ID: <alpine.DEB.2.10.1405151015330.24665@gentwo.org>
Date:	Thu, 15 May 2014 10:16:39 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	hannes@...xchg.org, mhocko@...e.cz, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH RFC 3/3] slub: reparent memcg caches' slabs on memcg
 offline

On Thu, 15 May 2014, Vladimir Davydov wrote:

> I admit that's far not perfect, because kfree is really a hot path,
> where every byte of code matters, but unfortunately I don't see how we
> can avoid this in case we want slab re-parenting.

Do we even know that all objects in that slab belong to a certain cgroup?
AFAICT the fastpath currently do not allow to make that distinction.

> Again, I'd like to hear from you if there is any point in moving in this
> direction, or I should give up and concentrate on some other approach,
> because you'll never accept it.

I wish you would find some other way to do this.

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