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Date: Fri, 18 Jul 2008 09:17:55 -0500 From: Christoph Lameter <cl@...ux-foundation.org> To: Richard Kennedy <richard@....demon.co.uk> CC: penberg@...helsinki.fi, mpm@...enic.com, linux-mm <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>, Mel Gorman <mel@....ul.ie> Subject: Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches Richard Kennedy wrote: > Slabcache: dentry Aliases: 0 Order : 0 Objects: 22553 > ** Reclaim accounting active > > Sizes (bytes) Slabs Debug Memory > ------------------------------------------------------------------------ > Object : 208 Total : 1188 Sanity Checks : Off Total: 4866048 > SlabObj: 208 Full : 1186 Redzoning : Off Used : 4691024 > SlabSiz: 4096 Partial: 0 Poisoning : Off Loss : 175024 > Loss : 0 CpuSlab: 2 Tracking : Off Lalig: 0 > Align : 8 Objects: 19 Tracing : Off Lpadd: 171072 So we are using 1188 pages before make > and after a make kernel & a small delay 2399 pages after make > on 2.6.26 + my patch 579 * 2 = 1158 (saved 30 pages even before doing anything) before make > after the make 2025 *2 = 4050 pages which are much more than the 2399 with order 0. So we are wasting a lot more space. You'd probably need to run slab defrag to get that memory back. -- 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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