Make it possible to set dirty_ratio to 0, setting it to MAX_WRITEBACK_PAGES
when the value is ultra low, and set background to 0 when that is the case.
Signed-off-by: Con Kolivas <[email protected]>
---
mm/page-writeback.c | 10 ++++------
1 files changed, 4 insertions(+), 6 deletions(-)
Index: linux-ck-dev/mm/page-writeback.c
===================================================================
--- linux-ck-dev.orig/mm/page-writeback.c 2006-06-18 15:20:11.000000000 +1000
+++ linux-ck-dev/mm/page-writeback.c 2006-06-18 15:25:16.000000000 +1000
@@ -126,9 +126,6 @@ static void get_writeback_state(struct w
*
* We only allow 1/2 of the currently-unmapped memory to be dirtied.
*
- * We don't permit the clamping level to fall below 5% - that is getting rather
- * excessive.
- *
* We make sure that the background writeout level is below the adjusted
* clamping level.
*/
@@ -162,15 +159,16 @@ get_dirty_limits(struct writeback_state
if (dirty_ratio > unmapped_ratio / 2)
dirty_ratio = unmapped_ratio / 2;
- if (dirty_ratio < 5)
- dirty_ratio = 5;
-
background_ratio = dirty_background_ratio;
if (background_ratio >= dirty_ratio)
background_ratio = dirty_ratio / 2;
background = (background_ratio * available_memory) / 100;
dirty = (dirty_ratio * available_memory) / 100;
+ if (dirty < MAX_WRITEBACK_PAGES) {
+ dirty = MAX_WRITEBACK_PAGES;
+ background = 0;
+ }
tsk = current;
if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) {
background += background / 4;
--
-ck
-
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