From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752351AbdA3Fw0 (ORCPT ); Mon, 30 Jan 2017 00:52:26 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:57711 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751574AbdA3Fvb (ORCPT ); Mon, 30 Jan 2017 00:51:31 -0500 Smtp-Origin-Hostprefix: devbig From: Shaohua Li Smtp-Origin-Hostname: devbig638.prn2.facebook.com To: , CC: , , , , , , Smtp-Origin-Cluster: prn2c22 Subject: [RFC 6/6] mm: enable MADV_FREE for swapless system Date: Sun, 29 Jan 2017 21:51:23 -0800 Message-ID: <50b078171991f3ffdbdc34b6e0d7b3a146b7c859.1485748619.git.shli@fb.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: References: X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-01-30_04:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now MADV_FREE pages can be easily reclaimed even for swapless system. We can safely enable MADV_FREE for all systems. Cc: Michal Hocko Cc: Minchan Kim Cc: Hugh Dickins Cc: Johannes Weiner Cc: Rik van Riel Cc: Mel Gorman Signed-off-by: Shaohua Li --- mm/madvise.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index 78b4b02..047cfd4 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -579,13 +579,7 @@ madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev, case MADV_WILLNEED: return madvise_willneed(vma, prev, start, end); case MADV_FREE: - /* - * XXX: In this implementation, MADV_FREE works like - * MADV_DONTNEED on swapless system or full swap. - */ - if (get_nr_swap_pages() > 0) - return madvise_free(vma, prev, start, end); - /* passthrough */ + return madvise_free(vma, prev, start, end); case MADV_DONTNEED: return madvise_dontneed(vma, prev, start, end); default: -- 2.9.3