Messages in this thread | | | Subject | Re: [PATCH][RFC] slub: increasing order reduces memory usage of some key caches | From | Richard Kennedy <> | Date | Fri, 18 Jul 2008 10:57:05 +0100 |
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On Wed, 2008-07-16 at 09:03 -0500, Christoph Lameter wrote: > Richard Kennedy wrote: > > > before > > dentry 82136 82137 208 19 1 : tunables 0 0 0 : slabdata 4323 4323 0 > > after > > dentry 79482 79482 208 39 2 : tunables 0 0 0 : slabdata 2038 2038 0 > > 19 objects with an order 1 alloc and 208 byte size? Urgh. 8192/208 = 39 and not 19. > > Kmemcheck or something else active? We seem to be loosing 50% of our memory. > > Pekka: Is the slabinfo emulation somehow broken? > > I'd really like to see the output of slabinfo dentry. >
here's that slabinfo for dentry
on 2.6.26 after booting & starting X
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
and after a make kernel & a small delay
dentry: No NUMA information available.
Slabcache: radix_tree_node Aliases: 0 Order : 1 Objects: 33564 ** Reclaim accounting active
Sizes (bytes) Slabs Debug Memory ------------------------------------------------------------------------ Object : 552 Total : 2399 Sanity Checks : Off Total: 19652608 SlabObj: 560 Full : 2391 Redzoning : Off Used : 18527328 SlabSiz: 8192 Partial: 6 Poisoning : Off Loss : 1125280 Loss : 8 CpuSlab: 2 Tracking : Off Lalig: 268512 Align : 0 Objects: 14 Tracing : Off Lpadd: 844448
************* on 2.6.26 + my patch
Slabcache: dentry Aliases: 0 Order : 1 Objects: 22581 ** Reclaim accounting active
Sizes (bytes) Slabs Debug Memory ------------------------------------------------------------------------ Object : 208 Total : 579 Sanity Checks : Off Total: 4743168 SlabObj: 208 Full : 577 Redzoning : Off Used : 4696848 SlabSiz: 8192 Partial: 0 Poisoning : Off Loss : 46320 Loss : 0 CpuSlab: 2 Tracking : Off Lalig: 0 Align : 8 Objects: 39 Tracing : Off Lpadd: 46320
after the make Slabcache: dentry Aliases: 0 Order : 1 Objects: 80168 ** Reclaim accounting active
Sizes (bytes) Slabs Debug Memory ------------------------------------------------------------------------ Object : 208 Total : 2056 Sanity Checks : Off Total: 16842752 SlabObj: 208 Full : 2043 Redzoning : Off Used : 16674944 SlabSiz: 8192 Partial: 11 Poisoning : Off Loss : 167808 Loss : 0 CpuSlab: 2 Tracking : Off Lalig: 0 Align : 8 Objects: 39 Tracing : Off Lpadd: 164480
Richard
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