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Date: Mon, 15 Jan 2007 21:48:14 -0800 (PST) From: Christoph Lameter <clameter@....com> To: akpm@...l.org Cc: Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org, Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org, Andi Kleen <ak@...e.de>, Paul Jackson <pj@....com>, Dave Chinner <dgc@....com>, Christoph Lameter <clameter@....com> 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@....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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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