From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 7D8476B0038 for ; Fri, 24 Feb 2017 16:31:53 -0500 (EST) Received: by mail-pf0-f198.google.com with SMTP id c193so48413415pfb.7 for ; Fri, 24 Feb 2017 13:31:53 -0800 (PST) Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com. [67.231.145.42]) by mx.google.com with ESMTPS id z22si8348332pll.224.2017.02.24.13.31.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 24 Feb 2017 13:31:52 -0800 (PST) Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1OLTvG5027953 for ; Fri, 24 Feb 2017 13:31:52 -0800 Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 28tunc88be-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Fri, 24 Feb 2017 13:31:52 -0800 Received: from facebook.com (2401:db00:21:603d:face:0:19:0) by mx-out.facebook.com (10.102.107.99) with ESMTP id a778d378fad811e684420002c99293a0-df9d4a00 for ; Fri, 24 Feb 2017 13:31:51 -0800 From: Shaohua Li Subject: [PATCH V5 5/6] mm: enable MADV_FREE for swapless system Date: Fri, 24 Feb 2017 13:31:48 -0800 Message-ID: <155648585589300bfae1d45078e7aebb3d988b87.1487965799.git.shli@fb.com> In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Kernel-team@fb.com, mhocko@suse.com, minchan@kernel.org, hughd@google.com, hannes@cmpxchg.org, riel@redhat.com, mgorman@techsingularity.net, akpm@linux-foundation.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: Rik van Riel Cc: Mel Gorman Cc: Andrew Morton Acked-by: Johannes Weiner 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 225af7d..5ab4b7b 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -612,13 +612,7 @@ 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org