It was observed that if order is passed as more than MAX_ORDER allocation in __alloc_pages_nodemask, it will unnecessarily go to slowpath and then return failure. Since we know that more than MAX_ORDER will anyways fail, we can avoid slowpath by returning failure in nodemask itself.
Signed-off-by: Pintu Kumar <pint...@samsung.com> --- mm/page_alloc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 202ab58..6d38e75 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1564,6 +1564,10 @@ __setup("fail_page_alloc=", setup_fail_page_alloc); static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order) { + if (order >= MAX_ORDER) { + WARN_ON(!(gfp_mask & __GFP_NOWARN)); + return false; + } if (order < fail_page_alloc.min_order) return false; if (gfp_mask & __GFP_NOFAIL) -- 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/