/[pkg-src]/trunk/kernel26-magellan/patches-2.6.17-r6/0025-2.6.17-mm-decrease_minimum_dirty_ratio.patch |
Contents of /trunk/kernel26-magellan/patches-2.6.17-r6/0025-2.6.17-mm-decrease_minimum_dirty_ratio.patch
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Sun Mar 11 16:17:56 2007 UTC (17 years, 6 months ago) by niro
File size: 1512 byte(s)
Sun Mar 11 16:17:56 2007 UTC (17 years, 6 months ago) by niro
File size: 1512 byte(s)
2.6.17-magellan-r6
1 | Make it possible to set dirty_ratio to 0, setting it to MAX_WRITEBACK_PAGES |
2 | when the value is ultra low, and set background to 0 when that is the case. |
3 | |
4 | Signed-off-by: Con Kolivas <kernel@kolivas.org> |
5 | |
6 | --- |
7 | mm/page-writeback.c | 10 ++++------ |
8 | 1 files changed, 4 insertions(+), 6 deletions(-) |
9 | |
10 | Index: linux-ck-dev/mm/page-writeback.c |
11 | =================================================================== |
12 | --- linux-ck-dev.orig/mm/page-writeback.c 2006-06-18 15:20:11.000000000 +1000 |
13 | +++ linux-ck-dev/mm/page-writeback.c 2006-06-18 15:25:16.000000000 +1000 |
14 | @@ -126,9 +126,6 @@ static void get_writeback_state(struct w |
15 | * |
16 | * We only allow 1/2 of the currently-unmapped memory to be dirtied. |
17 | * |
18 | - * We don't permit the clamping level to fall below 5% - that is getting rather |
19 | - * excessive. |
20 | - * |
21 | * We make sure that the background writeout level is below the adjusted |
22 | * clamping level. |
23 | */ |
24 | @@ -162,15 +159,16 @@ get_dirty_limits(struct writeback_state |
25 | if (dirty_ratio > unmapped_ratio / 2) |
26 | dirty_ratio = unmapped_ratio / 2; |
27 | |
28 | - if (dirty_ratio < 5) |
29 | - dirty_ratio = 5; |
30 | - |
31 | background_ratio = dirty_background_ratio; |
32 | if (background_ratio >= dirty_ratio) |
33 | background_ratio = dirty_ratio / 2; |
34 | |
35 | background = (background_ratio * available_memory) / 100; |
36 | dirty = (dirty_ratio * available_memory) / 100; |
37 | + if (dirty < MAX_WRITEBACK_PAGES) { |
38 | + dirty = MAX_WRITEBACK_PAGES; |
39 | + background = 0; |
40 | + } |
41 | tsk = current; |
42 | if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) { |
43 | background += background / 4; |