Messages in this thread Patch in this message | | | Date | Tue, 17 Jul 2007 14:36:48 -0700 | From | Ethan Solomita <> | Subject | [PATCH 5/6] cpuset write vm writeout |
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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>
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Patch against 2.6.22-rc6-mm1
diff -uprN -X 0/Documentation/dontdiff 4/include/linux/writeback.h 5/include/linux/writeback.h --- 4/include/linux/writeback.h 2007-07-11 21:16:25.000000000 -0700 +++ 5/include/linux/writeback.h 2007-07-11 21:16:50.000000000 -0700 @@ -95,7 +95,7 @@ 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 2007-07-16 18:31:13.000000000 -0700 +++ 5/mm/page-writeback.c 2007-07-16 18:32:08.000000000 -0700 @@ -384,7 +384,7 @@ 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; @@ -399,7 +399,7 @@ 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 2007-07-11 21:16:26.000000000 -0700 +++ 5/mm/vmscan.c 2007-07-11 21:16:50.000000000 -0700 @@ -1064,7 +1064,7 @@ 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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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