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authorZhang Yanmin <yanmin.zhang@linux.intel.com>2009-02-12 11:00:17 -0500
committerPekka Enberg <penberg@cs.helsinki.fi>2009-02-20 05:26:12 -0500
commite8120ff1ffc51102ead1f4c98a3fd5d26fefc722 (patch)
tree3cdadf0dc36df4a34f5ef30a788ef62d3a601de8 /mm/slob.c
parent51735a7ca67531267a27b57e5fe20f7815192f9c (diff)
SLUB: Fix default slab order for big object sizes
The default order of kmalloc-8192 on 2*4 stoakley is an issue of calculate_order. slab_size order name ------------------------------------------------- 4096 3 sgpool-128 8192 2 kmalloc-8192 16384 3 kmalloc-16384 kmalloc-8192's default order is smaller than sgpool-128's. On 4*4 tigerton machine, a similiar issue appears on another kmem_cache. Function calculate_order uses 'min_objects /= 2;' to shrink. Plus size calculation/checking in slab_order, sometimes above issue appear. Below patch against 2.6.29-rc2 fixes it. I checked the default orders of all kmem_cache and they don't become smaller than before. So the patch wouldn't hurt performance. Signed-off-by Zhang Yanmin <yanmin.zhang@linux.intel.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
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