Messages in this thread | | | Date | Thu, 21 Apr 2011 00:39:40 -0400 | From | Christoph Hellwig <> | Subject | Re: [PATCH 5/6] writeback: try more writeback as long as something was written |
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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.
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