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    Subject[RFC 6/8] Throttle vm writeout per cpuset
    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 and will
    therefore not throttle unless global limits are reached.

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

    Index: linux-2.6.20-rc5/include/linux/writeback.h
    ===================================================================
    --- linux-2.6.20-rc5.orig/include/linux/writeback.h 2007-01-15 21:37:05.209897874 -0600
    +++ linux-2.6.20-rc5/include/linux/writeback.h 2007-01-15 21:37:33.283671963 -0600
    @@ -85,7 +85,7 @@ static inline void wait_on_inode(struct
    int wakeup_pdflush(long nr_pages, nodemask_t *nodes);
    void laptop_io_completion(void);
    void laptop_sync_completion(void);
    -void throttle_vm_writeout(void);
    +void throttle_vm_writeout(nodemask_t *);

    /* These are exported to sysctl. */
    extern int dirty_background_ratio;
    Index: linux-2.6.20-rc5/mm/page-writeback.c
    ===================================================================
    --- linux-2.6.20-rc5.orig/mm/page-writeback.c 2007-01-15 21:35:28.013794159 -0600
    +++ linux-2.6.20-rc5/mm/page-writeback.c 2007-01-15 21:37:33.302228293 -0600
    @@ -349,12 +349,12 @@ void balance_dirty_pages_ratelimited_nr(
    }
    EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr);

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

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

    /*
    * Boost the allowable dirty threshold a bit for page
    Index: linux-2.6.20-rc5/mm/vmscan.c
    ===================================================================
    --- linux-2.6.20-rc5.orig/mm/vmscan.c 2007-01-15 21:37:26.605346439 -0600
    +++ linux-2.6.20-rc5/mm/vmscan.c 2007-01-15 21:37:33.316878027 -0600
    @@ -949,7 +949,7 @@ static unsigned long shrink_zone(int pri
    }
    }

    - throttle_vm_writeout();
    + throttle_vm_writeout(&cpuset_current_mems_allowed);

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