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| author | Wu Fengguang <fengguang.wu@intel.com> | 2011-08-05 06:16:46 +0200 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-10-03 15:08:58 +0200 |
| commit | 8927f66c4ede9a18b4b58f7e6f9debca67065f6b (patch) | |
| tree | f7c8490ab23a20cb86874ca8112f3dd1fc6002ae /Documentation/stable_api_nonsense.txt | |
| parent | writeback: control dirty pause time (diff) | |
| download | linux-8927f66c4ede9a18b4b58f7e6f9debca67065f6b.tar.xz linux-8927f66c4ede9a18b4b58f7e6f9debca67065f6b.zip | |
writeback: dirty position control - bdi reserve area
Keep a minimal pool of dirty pages for each bdi, so that the disk IO
queues won't underrun. Also gently increase a small bdi_thresh to avoid
it stuck in 0 for some light dirtied bdi.
It's particularly useful for JBOD and small memory system.
It may result in (pos_ratio > 1) at the setpoint and push the dirty
pages high. This is more or less intended because the bdi is in the
danger of IO queue underflow.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'Documentation/stable_api_nonsense.txt')
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