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    Subject[PATCH 4/4] mm: use swap readahead at swapoff
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    Date
    try_to_unuse() iterates over swap-entries sequentially,
    thus readahead here will not hurt.

    Test results:
    Virtual machine: without patch 7 seconds, with patch 4 seconds.
    Real hardware: without patch 100 seconds, with patch 70 seconds.

    Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
    ---
    mm/swapfile.c | 3 +--
    1 files changed, 1 insertions(+), 2 deletions(-)

    diff --git a/mm/swapfile.c b/mm/swapfile.c
    index d999f09..4c99689 100644
    --- a/mm/swapfile.c
    +++ b/mm/swapfile.c
    @@ -1106,8 +1106,7 @@ static int try_to_unuse(unsigned int type)
    */
    swap_map = &si->swap_map[i];
    entry = swp_entry(type, i);
    - page = read_swap_cache_async(entry,
    - GFP_HIGHUSER_MOVABLE, NULL, 0);
    + page = swapin_readahead(entry, GFP_HIGHUSER_MOVABLE, NULL, 0);
    if (!page) {
    /*
    * Either swap_duplicate() failed because entry


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