From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx197.postini.com [74.125.245.197]) by kanga.kvack.org (Postfix) with SMTP id CE13A6B0032 for ; Tue, 3 Sep 2013 10:15:43 -0400 (EDT) Date: Tue, 3 Sep 2013 14:15:42 +0000 From: Christoph Lameter Subject: Re: [PATCH 0/4] slab: implement byte sized indexes for the freelist of a slab In-Reply-To: <1378111138-30340-1-git-send-email-iamjoonsoo.kim@lge.com> Message-ID: <00000140e42dcd61-00e6cf6a-457c-48bd-8bf7-830133923564-000000@email.amazonses.com> References: <1378111138-30340-1-git-send-email-iamjoonsoo.kim@lge.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim Cc: Pekka Enberg , Andrew Morton , Joonsoo Kim , David Rientjes , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Mon, 2 Sep 2013, Joonsoo Kim wrote: > This patchset implements byte sized indexes for the freelist of a slab. > > Currently, the freelist of a slab consist of unsigned int sized indexes. > Most of slabs have less number of objects than 256, so much space is wasted. > To reduce this overhead, this patchset implements byte sized indexes for > the freelist of a slab. With it, we can save 3 bytes for each objects. > > This introduce one likely branch to functions used for setting/getting > objects to/from the freelist, but we may get more benefits from > this change. > > Below is some numbers of 'cat /proc/slabinfo' related to my previous posting > and this patchset. You may also want to run some performance tests. The cache footprint should also be reduced with this patchset and therefore performance should be better. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org