[PATCH 5/5] Throttle vm writeout per cpuset
From: Christoph Lameter <hidden>
Date: 2007-01-23 18:53:09
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 <redacted> 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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