We rarely allocate a page with ALLOC_NO_WATERMARKS and it is used in slow path. For making fast path more faster, add likely macro to help compiler optimization.
Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com> diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b100255..86ad44b 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1901,7 +1901,7 @@ zonelist_scan: goto this_zone_full; BUILD_BUG_ON(ALLOC_NO_WATERMARKS < NR_WMARK); - if (!(alloc_flags & ALLOC_NO_WATERMARKS)) { + if (likely(!(alloc_flags & ALLOC_NO_WATERMARKS))) { unsigned long mark; int ret; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/