From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx136.postini.com [74.125.245.136]) by kanga.kvack.org (Postfix) with SMTP id 880386B005A for ; Fri, 16 Dec 2011 18:37:18 -0500 (EST) Date: Fri, 16 Dec 2011 15:37:16 -0800 From: Andrew Morton Subject: Re: [PATCH 0/11] Reduce compaction-related stalls and improve asynchronous migration of dirty pages v6 Message-Id: <20111216153716.434bbf05.akpm@linux-foundation.org> In-Reply-To: <1323877293-15401-1-git-send-email-mgorman@suse.de> References: <1323877293-15401-1-git-send-email-mgorman@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Andrea Arcangeli , Minchan Kim , Dave Jones , Jan Kara , Andy Isaacson , Johannes Weiner , Rik van Riel , Nai Xia , Linux-MM , LKML On Wed, 14 Dec 2011 15:41:22 +0000 Mel Gorman wrote: > Short summary: There are severe stalls when a USB stick using VFAT > is used with THP enabled that are reduced by this series. If you are > experiencing this problem, please test and report back and considering > I have seen complaints from openSUSE and Fedora users on this as well > as a few private mails, I'm guessing it's a widespread issue. This > is a new type of USB-related stall because it is due to synchronous > compaction writing where as in the past the big problem was dirty > pages reaching the end of the LRU and being written by reclaim. Overall footprint: fs/btrfs/disk-io.c | 5 fs/hugetlbfs/inode.c | 3 fs/nfs/internal.h | 2 fs/nfs/write.c | 4 include/linux/fs.h | 11 +- include/linux/migrate.h | 23 +++- include/linux/mmzone.h | 4 include/linux/vm_event_item.h | 1 mm/compaction.c | 5 mm/memory-failure.c | 2 mm/memory_hotplug.c | 2 mm/mempolicy.c | 2 mm/migrate.c | 171 +++++++++++++++++++++----------- mm/page_alloc.c | 50 +++++++-- mm/swap.c | 74 ++++++++++++- mm/vmscan.c | 114 ++++++++++++++++++--- mm/vmstat.c | 2 17 files changed, 371 insertions(+), 104 deletions(-) The line count belies the increase in complexity. Sigh, this whole hugetlb page thing is just killing us. -- 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