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    Subject[RFC 5/7] Laundry handling for direct reclaim
    Direct reclaim collects a global laundry list in try_to_free_pages().

    Pages are only written back after a reclaim pass is complete.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>

    ---
    mm/vmscan.c | 12 +++++++++---
    1 file changed, 9 insertions(+), 3 deletions(-)

    Index: linux-2.6/mm/vmscan.c
    ===================================================================
    --- linux-2.6.orig/mm/vmscan.c 2007-08-19 23:30:15.000000000 -0700
    +++ linux-2.6/mm/vmscan.c 2007-08-19 23:53:43.000000000 -0700
    @@ -1099,7 +1099,7 @@ static unsigned long shrink_zone(int pri
    * scan then give up on it.
    */
    static unsigned long shrink_zones(int priority, struct zone **zones,
    - struct scan_control *sc)
    + struct scan_control *sc, struct list_head *laundry)
    {
    unsigned long nr_reclaimed = 0;
    int i;
    @@ -1121,7 +1121,7 @@ static unsigned long shrink_zones(int pr

    sc->all_unreclaimable = 0;

    - nr_reclaimed += shrink_zone(priority, zone, sc, NULL);
    + nr_reclaimed += shrink_zone(priority, zone, sc, laundry);
    }
    return nr_reclaimed;
    }
    @@ -1156,6 +1156,7 @@ unsigned long try_to_free_pages(struct z
    .swappiness = vm_swappiness,
    .order = order,
    };
    + LIST_HEAD(laundry);

    count_vm_event(ALLOCSTALL);

    @@ -1170,16 +1171,19 @@ unsigned long try_to_free_pages(struct z
    }

    for (priority = DEF_PRIORITY; priority >= 0; priority--) {
    +
    sc.nr_scanned = 0;
    if (!priority)
    disable_swap_token();
    - nr_reclaimed += shrink_zones(priority, zones, &sc);
    + nr_reclaimed += shrink_zones(priority, zones, &sc, &laundry);
    shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
    if (reclaim_state) {
    nr_reclaimed += reclaim_state->reclaimed_slab;
    reclaim_state->reclaimed_slab = 0;
    }
    +
    total_scanned += sc.nr_scanned;
    +
    if (nr_reclaimed >= sc.swap_cluster_max) {
    ret = 1;
    goto out;
    @@ -1223,6 +1227,8 @@ out:

    zone->prev_priority = priority;
    }
    + nr_reclaimed += shrink_page_list(&laundry, &sc, NULL);
    + release_lru_pages(&laundry);
    return ret;
    }

    --
    -
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