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authorRichard Kennedy <richard@rsk.demon.co.uk>2010-03-10 15:20:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-12 15:52:27 -0800
commit019b4d123aa7b9fc135b532e021cfde85db7665d (patch)
tree91edbae535136417bc1277dd2c40d98c7ea7ec8f /drivers/rtc
parent03affdef4fc85e416e3862abb0aa549c6034cdd0 (diff)
fs: buffer_head: remove kmem_cache constructor to reduce memory usage under slub
When using slub, having a kmem_cache constructor forces slub to add a free pointer to the size of the cached object, which can have a significant impact to the number of small objects that can fit into a slab. As buffer_head is relatively small and we can have large numbers of them, removing the constructor is a definite win. On x86_64 removing the constructor gives me 39 objects/slab, 3 more than without the patch. And on x86_32 73 objects/slab, which is 9 more. As alloc_buffer_head() already initializes each new object there is very little difference in actual code run. Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <jens.axboe@oracle.com> Acked-by: Nick Piggin <npiggin@suse.de> Cc: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
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