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    Subject[PATCH 5/6] cpuset write vm writeout
    Throttle VM writeout in a cpuset aware way

    This bases the vm throttling from the reclaim path on the dirty ratio
    of the cpuset. Note that a cpuset is only effective if shrink_zone is called
    from direct reclaim.

    kswapd has a cpuset context that includes the whole machine. VM throttling
    will only work during synchrononous reclaim and not from kswapd.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>
    Acked-by: Ethan Solomita <solo@google.com>

    ---

    Patch against 2.6.23-rc4-mm1

    diff -uprN -X 0/Documentation/dontdiff 4/include/linux/writeback.h 5/include/linux/writeback.h
    --- 4/include/linux/writeback.h 2007-09-11 14:49:47.000000000 -0700
    +++ 5/include/linux/writeback.h 2007-09-11 14:50:52.000000000 -0700
    @@ -94,7 +94,7 @@ static inline void inode_sync_wait(struc
    int wakeup_pdflush(long nr_pages, nodemask_t *nodes);
    void laptop_io_completion(void);
    void laptop_sync_completion(void);
    -void throttle_vm_writeout(gfp_t gfp_mask);
    +void throttle_vm_writeout(nodemask_t *nodes,gfp_t gfp_mask);

    /* These are exported to sysctl. */
    extern int dirty_background_ratio;
    diff -uprN -X 0/Documentation/dontdiff 4/mm/page-writeback.c 5/mm/page-writeback.c
    --- 4/mm/page-writeback.c 2007-09-11 14:49:47.000000000 -0700
    +++ 5/mm/page-writeback.c 2007-09-11 14:50:52.000000000 -0700
    @@ -386,7 +386,7 @@ void balance_dirty_pages_ratelimited_nr(
    }
    EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);

    -void throttle_vm_writeout(gfp_t gfp_mask)
    +void throttle_vm_writeout(nodemask_t *nodes, gfp_t gfp_mask)
    {
    struct dirty_limits dl;

    @@ -401,7 +401,7 @@ void throttle_vm_writeout(gfp_t gfp_mask
    }

    for ( ; ; ) {
    - get_dirty_limits(&dl, NULL, &node_online_map);
    + get_dirty_limits(&dl, NULL, nodes);

    /*
    * Boost the allowable dirty threshold a bit for page
    diff -uprN -X 0/Documentation/dontdiff 4/mm/vmscan.c 5/mm/vmscan.c
    --- 4/mm/vmscan.c 2007-09-11 14:50:41.000000000 -0700
    +++ 5/mm/vmscan.c 2007-09-11 14:50:52.000000000 -0700
    @@ -1185,7 +1185,7 @@ static unsigned long shrink_zone(int pri
    }
    }

    - throttle_vm_writeout(sc->gfp_mask);
    + throttle_vm_writeout(&cpuset_current_mems_allowed, sc->gfp_mask);

    atomic_dec(&zone->reclaim_in_progress);
    return nr_reclaimed;
    -
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