linux-kernel - Re: [PATCH -mm 2/3] slab: zap kmem_cache

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Message-ID: <alpine.DEB.2.11.1501261226250.16638@gentwo.org>
Date:	Mon, 26 Jan 2015 12:26:57 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 2/3] slab: zap kmem_cache_shrink return value

On Mon, 26 Jan 2015, Vladimir Davydov wrote:

> __cache_shrink() is used not only in __kmem_cache_shrink(), but also in
> SLAB's __kmem_cache_shutdown(), where we do need its return value to
> check if the cache is empty.

It could be useful to know if a slab is empty. So maybe leave
kmem_cache_shrink the way it is and instead fix up slub to return the
proper value?

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