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    Subject[PATCH 4/8] readahead: state based method: move readahead_ratio out of compute_thrashing_threshold()
    Make compute_thrashing_threshold() a pure computing routine,
    by moving the readahead_ratio policy out of it.

    Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
    ---
    mm/readahead.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)
    --- linux-2.6.20-rc4-mm1.orig/mm/readahead.c
    +++ linux-2.6.20-rc4-mm1/mm/readahead.c
    @@ -1025,7 +1025,7 @@ static unsigned long compute_thrashing_t
    stream_shift = ra_invoke_interval(ra);

    /* future safe space */
    - ll = (uint64_t) stream_shift * (global_size >> 9) * readahead_ratio * 5;
    + ll = (uint64_t) stream_shift * global_size;
    do_div(ll, global_shift);
    ra_size = ll;

    @@ -1063,6 +1063,7 @@ state_based_readahead(struct address_spa
    la_old = la_size = ra->readahead_index - offset;
    ra_old = ra_readahead_size(ra);
    ra_size = compute_thrashing_threshold(ra, &remain_space);
    + ra_size = ra_size * readahead_ratio / 100;

    if (page && remain_space <= la_size) {
    rescue_pages(page, la_size);
    --
    -
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