From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752761Ab2HYOMf (ORCPT ); Sat, 25 Aug 2012 10:12:35 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:44547 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751441Ab2HYOM1 (ORCPT ); Sat, 25 Aug 2012 10:12:27 -0400 From: Joonsoo Kim To: Pekka Enberg Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Joonsoo Kim , Mel Gorman , Christoph Lameter Subject: [PATCH 1/2] slab: do ClearSlabPfmemalloc() for all pages of slab Date: Sat, 25 Aug 2012 23:11:10 +0900 Message-Id: <1345903871-1921-1-git-send-email-js1304@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now, we just do ClearSlabPfmemalloc() for first page of slab when we clear SlabPfmemalloc flag. It is a problem because we sometimes test flag of page which is not first page of slab in __ac_put_obj(). So add code to do ClearSlabPfmemalloc for all pages of slab. Signed-off-by: Joonsoo Kim Cc: Mel Gorman Cc: Christoph Lameter --- This patch based on Pekka's slab/next tree diff --git a/mm/slab.c b/mm/slab.c index 3b4587b..45cf59a 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -992,8 +992,11 @@ static void *__ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac, */ l3 = cachep->nodelists[numa_mem_id()]; if (!list_empty(&l3->slabs_free) && force_refill) { - struct slab *slabp = virt_to_slab(objp); - ClearPageSlabPfmemalloc(virt_to_page(slabp->s_mem)); + int i, nr_pages = (1 << cachep->gfporder); + struct page *page = virt_to_head_page(objp); + + for (i = 0; i < nr_pages; i++) + ClearPageSlabPfmemalloc(page + i); clear_obj_pfmemalloc(&objp); recheck_pfmemalloc_active(cachep, ac); return objp; -- 1.7.9.5