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Message-ID: <alpine.DEB.2.02.1401142109050.7751@chino.kir.corp.google.com> Date: Tue, 14 Jan 2014 21:09:15 -0800 (PST) From: David Rientjes <rientjes@...gle.com> To: Joonsoo Kim <iamjoonsoo.kim@....com> cc: Pekka Enberg <penberg@...nel.org>, Christoph Lameter <cl@...ux.com>, Andrew Morton <akpm@...ux-foundation.org>, Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com> Subject: Re: [PATCH v3 5/5] slab: make more slab management structure off the slab On Mon, 2 Dec 2013, Joonsoo Kim wrote: > Now, the size of the freelist for the slab management diminish, > so that the on-slab management structure can waste large space > if the object of the slab is large. > > Consider a 128 byte sized slab. If on-slab is used, 31 objects can be > in the slab. The size of the freelist for this case would be 31 bytes > so that 97 bytes, that is, more than 75% of object size, are wasted. > > In a 64 byte sized slab case, no space is wasted if we use on-slab. > So set off-slab determining constraint to 128 bytes. > > Acked-by: Christoph Lameter <cl@...ux.com> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com> Acked-by: David Rientjes <rientjes@...gle.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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