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    Annotation of /trunk/kernel26-magellan/patches-2.6.17-r6/0025-2.6.17-mm-decrease_minimum_dirty_ratio.patch

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    Revision 105 - (hide annotations) (download)
    Sun Mar 11 16:17:56 2007 UTC (17 years, 2 months ago) by niro
    File size: 1512 byte(s) 
    2.6.17-magellan-r6
    1 niro 105 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;