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Subject[PATCH 00/13] writeback patches for 2.6.36

These are writeback patches intended for 2.6.36.

It's combined from 2 previous patchsets:

writeback cleanups and trivial fixes <>
writeback: try to write older pages first <>

- removed patch "writeback: take account of NR_WRITEBACK_TEMP in balance_dirty_pages()"
- added patch "writeback: explicit low bound for vm.dirty_ratio"
- use "if (list_empty(&wb->b_io))" directly in "writeback: sync expired inodes first in background writeback"
- fix misplaced chunk for removing more_io in include/trace/events/ext4.h
- update comments in "writeback: fix queue_io() ordering"
- update comments in "writeback: add comment to the dirty limits functions"
- patch "writeback: try more writeback as long as something was written" will
no longer livelock sync() with Jan's sync() livelock avoidance patches

[PATCH 01/13] writeback: reduce calls to global_page_state in balance_dirty_pages()
[PATCH 02/13] writeback: avoid unnecessary calculation of bdi dirty thresholds
[PATCH 03/13] writeback: add comment to the dirty limits functions
[PATCH 04/13] writeback: dont redirty tail an inode with dirty pages
[PATCH 05/13] writeback: fix queue_io() ordering
[PATCH 06/13] writeback: merge for_kupdate and !for_kupdate cases
[PATCH 07/13] writeback: explicit low bound for vm.dirty_ratio
[PATCH 08/13] writeback: pass writeback_control down to move_expired_inodes()
[PATCH 09/13] writeback: the kupdate expire timestamp should be a moving target
[PATCH 10/13] writeback: kill writeback_control.more_io
[PATCH 11/13] writeback: sync expired inodes first in background writeback
[PATCH 12/13] writeback: try more writeback as long as something was written
[PATCH 13/13] writeback: introduce writeback_control.inodes_written


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