From 34342e863c3143640c031760140d640a06c6a5f8 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sat, 3 Sep 2005 15:55:06 -0700 Subject: [PATCH] [PATCH] mm/slab.c: prefetchw the start of new allocated objects 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/slab.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/slab.c b/mm/slab.c index 59d382fbca1..75127a6f1fd 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -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; } -- 2.20.1