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[PATCH] mm/slab.c: prefetchw the start of new allocated objects

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Mostobjects returned by __cache_alloc() will be written by the caller,
(but not all callers want to write all the object, but just at the
begining) prefetchw() tells the modern CPU to think about the future
writes, ie start some memory transactions in advance.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Dumazet 2005-09-03 15:55:06 -07:00 committed by Linus Torvalds
parent 61e06037e7
commit 34342e863c
1 changed files with 3 additions and 1 deletions
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mm/slab.c
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@ -2166,7 +2166,9 @@ static inline void *__cache_alloc(kmem_cache_t *cachep, unsigned int __nocast fl
objp = cache_alloc_refill(cachep, flags);
}
local_irq_restore(save_flags);
objp = cache_alloc_debugcheck_after(cachep, flags, objp, __builtin_return_address(0));
objp = cache_alloc_debugcheck_after(cachep, flags, objp,
__builtin_return_address(0));
prefetchw(objp);
return objp;
}