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Date: Thu, 21 Apr 2011 00:39:40 -0400 From: Christoph Hellwig <hch@...radead.org> To: Wu Fengguang <fengguang.wu@...el.com> Cc: Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, Mel Gorman <mel@...ux.vnet.ibm.com>, Dave Chinner <david@...morbit.com>, Trond Myklebust <Trond.Myklebust@...app.com>, Itaru Kitayama <kitayama@...bb4u.ne.jp>, Minchan Kim <minchan.kim@...il.com>, LKML <linux-kernel@...r.kernel.org>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, Linux Memory Management List <linux-mm@...ck.org> Subject: Re: [PATCH 5/6] writeback: try more writeback as long as something was written On Thu, Apr 21, 2011 at 11:33:25AM +0800, Wu Fengguang wrote: > I collected the writeback_single_inode() traces (patch attached for > your reference) each for several test runs, and find much more > I_DIRTY_PAGES after patchset. Dave, do you know why there are so many > I_DIRTY_PAGES (or radix tag) remained after the XFS ->writepages() call, > even for small files? What is your defintion of a small file? As soon as it has multiple extents or holes there's absolutely no way to clean it with a single writepage call. Also XFS tries to operate as non-blocking as possible if the non-blocking flag is set in the wbc, but that flag actually seems to be dead these days. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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