On Mon, Aug 19, 2013 at 02:23:41PM +0200, Vlastimil Babka wrote: > The performance of the fast path in munlock_vma_range() can be further improved > by avoiding atomic ops of a redundant get_page()/put_page() pair. > > When calling get_page() during page isolation, we already have the pin from > follow_page_mask(). This pin will be then returned by __pagevec_lru_add(), > after which we do not reference the pages anymore. > > After this patch, an 8% speedup was measured for munlocking a 56GB large memory > area with THP disabled. > > Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> > Reviewed-by: Jörn Engel <joern@xxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxx> -- Mel Gorman SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>