From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id B9E696B00EE for ; Tue, 30 Aug 2011 21:10:03 -0400 (EDT) Message-ID: <4E5D89E3.6020008@redhat.com> Date: Tue, 30 Aug 2011 21:09:55 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 2/3] compaction: compact unevictable page References: <8ef02605a7a76b176167d90a285033afa8513326.1321112552.git.minchan.kim@gmail.com> In-Reply-To: <8ef02605a7a76b176167d90a285033afa8513326.1321112552.git.minchan.kim@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: Andrew Morton , linux-mm , LKML , Mel Gorman , Johannes Weiner On 11/12/2011 11:37 AM, Minchan Kim wrote: > Now compaction doesn't handle mlocked page as it uses __isolate_lru_page > which doesn't consider unevicatable page. It has been used by just lumpy so > it was pointless that it isolates unevictable page. But the situation is > changed. Compaction could handle unevictable page and it can help getting > big contiguos pages in fragment memory by many pinned page with mlock. > > I tested this patch with following scenario. > > 1. A : allocate 80% anon pages in system > 2. B : allocate 20% mlocked page in system > /* Maybe, mlocked pages are located in low pfn address */ > 3. kill A /* high pfn address are free */ > 4. echo 1> /proc/sys/vm/compact_memory > > old: > > compact_blocks_moved 251 > compact_pages_moved 44 > > new: > > compact_blocks_moved 258 > compact_pages_moved 412 > > CC: Mel Gorman > CC: Johannes Weiner > CC: Rik van Riel > Signed-off-by: Minchan Kim Reviewed-by: Rik van Riel -- All rights reversed -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org