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    Contents of /trunk/kernel26-alx/patches-2.6.17-r5/0025-2.6.17-mm-decrease_minimum_dirty_ratio.patch

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    Revision 199 - (show annotations) (download)
    Fri May 18 11:04:36 2007 UTC (16 years, 11 months ago) by niro
    File size: 1512 byte(s) 
    -import
    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;