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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx 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: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>