From: David Rientjes <rientjes@google.com>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>,
Christoph Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>,
Wanpeng Li <liwanp@linux.vnet.ibm.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Joonsoo Kim <js1304@gmail.com>
Subject: Re: [PATCH v3 5/5] slab: make more slab management structure off the slab
Date: Tue, 14 Jan 2014 21:09:15 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.02.1401142109050.7751@chino.kir.corp.google.com> (raw)
In-Reply-To: <1385974183-31423-6-git-send-email-iamjoonsoo.kim@lge.com>
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@linux.com>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: David Rientjes <rientjes@google.com>
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prev parent reply other threads:[~2014-01-15 5:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-02 8:49 [PATCH v3 0/5] slab: implement byte sized indexes for the freelist of a slab Joonsoo Kim
2013-12-02 8:49 ` [PATCH v3 1/5] slab: factor out calculate nr objects in cache_estimate Joonsoo Kim
2014-01-15 4:54 ` David Rientjes
2013-12-02 8:49 ` [PATCH v3 2/5] slab: introduce helper functions to get/set free object Joonsoo Kim
2014-01-15 4:57 ` David Rientjes
2013-12-02 8:49 ` [PATCH v3 3/5] slab: restrict the number of objects in a slab Joonsoo Kim
2013-12-02 19:45 ` Christoph Lameter
2014-01-15 5:05 ` David Rientjes
2013-12-02 8:49 ` [PATCH v3 4/5] slab: introduce byte sized index for the freelist of " Joonsoo Kim
2013-12-03 2:25 ` Joonsoo Kim
2013-12-03 15:24 ` Christoph Lameter
2014-01-15 5:08 ` David Rientjes
2013-12-02 8:49 ` [PATCH v3 5/5] slab: make more slab management structure off the slab Joonsoo Kim
2013-12-02 14:58 ` Christoph Lameter
2013-12-03 2:13 ` Joonsoo Kim
2013-12-13 7:03 ` Joonsoo Kim
2014-02-08 10:17 ` Pekka Enberg
2014-01-15 5:09 ` David Rientjes [this message]
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