[lkml]   [2005]   [Jul]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] mm/slab.c : prefetchw the start of new allocated objects

* Eric Dumazet <> wrote:

> local_irq_restore(save_flags);
> objp = cache_alloc_debugcheck_after(cachep, flags, objp, __builtin_return_address(0));
> + prefetchw(objp);
> return objp;

the idea is good, but i'd suggest to do the prefetchw a bit earlier,
right where we calculate objp. Furthermore, it might make sense to only
trigger the prefetchw in the alloc-miss (non-per-CPU cache) case. There
it's almost surely a win, in the per-CPU cache case it's not always.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-07-29 12:19    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean