Messages in this thread | | | Date | Fri, 18 Jul 2008 09:17:55 -0500 | From | Christoph Lameter <> | Subject | Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches |
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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.
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