[RFC 6/8] Throttle vm writeout per cpuset

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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 <[email protected]>

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 [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux