linux-kernel - Re: [PATCH -mm 4/8] slub: never fail kmem_cache

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Date:	Mon, 2 Jun 2014 10:13:54 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	akpm@...ux-foundation.org, hannes@...xchg.org, mhocko@...e.cz,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -mm 4/8] slub: never fail kmem_cache_shrink

On Sat, 31 May 2014, Vladimir Davydov wrote:

> ... which means more async workers, more complication to kmemcg code :-(
>
> Sorry, but I just don't get why we can't make kmem_cache_shrink never
> fail? Is failing de-fragmentation, which is even not implied by the
> function declaration, so critical that should be noted? If so, we can
> return an error while still shrinking empty slabs...

There could be other reasons for failure in the future as
kmem_cache_shrink is updated. Requiring kmem_cache_shrink to never fail
may cause problems for future modifications.

> If you just don't like the code after the patch, here is another, less
> intrusive version doing practically the same. Would it be better?

That looks acceptable.

Acked-by: Christoph Lameter <cl@...ux.com>
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