On Thu, 2008-10-23 at 19:14 +0200, Eric Dumazet wrote: > [PATCH] slub: slab_alloc() can use prefetchw() > > Most kmalloced() areas are initialized/written right after allocation. > > prefetchw() gives a hint to cpu saying this cache line is going to be > *modified*, even if first access is a read. > > Some architectures can save some bus transactions, acquiring > the cache line in an exclusive way instead of shared one. > > Same optimization was done in 2005 on SLAB in commit > 34342e863c3143640c031760140d640a06c6a5f8 > ([PATCH] mm/slab.c: prefetchw the start of new allocated objects) > > Signed-off-by: Eric Dumazet <dada1@xxxxxxxxxxxxx> Christoph, I was sort of expecting a NAK/ACK from you before merging this. I would be nice to have numbers on this but then again I don't see how this can hurt either. Pekka -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
