On Thu, Sep 29, 2011 at 09:32:26AM -0500, Seth Jennings wrote: > tmem uses hash buckets each with their own rbtree and lock to > quickly lookup tmem objects. tmem has TMEM_HASH_BUCKETS (256) > buckets per pool. However, because of the way the tmem_oid is > generated for frontswap pages, only 16 unique tmem_oids are being > generated, resulting in only 16 of the 256 buckets being used. > This cause high lock contention for the per bucket locks. > > This patch changes SWIZ_BITS to include more bits of the offset. > The result is that all 256 hash buckets are potentially used resulting in a > 95% drop in hash bucket lock contention. This patch is somehow corrupted and can't be applied, care to resend it with Dan's acked-by so that I can apply it? thanks, greg k-h _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
