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    Subject[PATCH 3/3] vm: writeout watermarks
    3/3

    --
    SUSE Labs, Novell Inc.

    Slightly change the writeout watermark calculations so we keep background
    and synchronous writeout watermarks in the same ratios after adjusting them.
    This ensures we should always attempt to start background writeout before
    synchronous writeout.

    Signed-off-by: Nick Piggin <npiggin@suse.de>


    Index: linux-2.6/mm/page-writeback.c
    ===================================================================
    --- linux-2.6.orig/mm/page-writeback.c 2005-11-01 13:41:39.000000000 +1100
    +++ linux-2.6/mm/page-writeback.c 2005-11-01 14:29:27.000000000 +1100
    @@ -165,9 +165,11 @@ get_dirty_limits(struct writeback_state
    if (dirty_ratio < 5)
    dirty_ratio = 5;

    - background_ratio = dirty_background_ratio;
    - if (background_ratio >= dirty_ratio)
    - background_ratio = dirty_ratio / 2;
    + /*
    + * Keep the ratio between dirty_ratio and background_ratio roughly
    + * what the sysctls are after dirty_ratio has been scaled (above).
    + */
    + background_ratio = dirty_background_ratio * dirty_ratio/vm_dirty_ratio;

    background = (background_ratio * available_memory) / 100;
    dirty = (dirty_ratio * available_memory) / 100;
    \
     
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