diff options
| author | David Rientjes <rientjes@google.com> | 2009-12-14 17:58:33 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 08:53:13 -0800 |
| commit | 8fe23e057172223fe2048768a4d87ab7de7477bc (patch) | |
| tree | d176d8e588fca088adfcb110e7c1bc53a839dc84 | |
| parent | 9b5e5d0fdc91b73bba8cf5e0fbe3521a953e4e4d (diff) | |
mm: clear node in N_HIGH_MEMORY and stop kswapd when all memory is offlined
When memory is hot-removed, its node must be cleared in N_HIGH_MEMORY if
there are no present pages left.
In such a situation, kswapd must also be stopped since it has nothing left
to do.
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Adam Litke <agl@us.ibm.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Eric Whitney <eric.whitney@hp.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/swap.h | 1 | ||||
| -rw-r--r-- | mm/memory_hotplug.c | 4 | ||||
| -rw-r--r-- | mm/vmscan.c | 28 |
3 files changed, 27 insertions, 6 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h index 4ec90019c1a4..abce8a0b2507 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -273,6 +273,7 @@ extern int scan_unevictable_register_node(struct node *node); extern void scan_unevictable_unregister_node(struct node *node); extern int kswapd_run(int nid); +extern void kswapd_stop(int nid); #ifdef CONFIG_MMU /* linux/mm/shmem.c */ diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index e8116f8bdffa..bc5a08138f1e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -853,6 +853,10 @@ repeat: setup_per_zone_wmarks(); calculate_zone_inactive_ratio(zone); + if (!node_present_pages(node)) { + node_clear_state(node, N_HIGH_MEMORY); + kswapd_stop(node); + } vm_total_pages = nr_free_pagecache_pages(); writeback_set_ratelimit(); diff --git a/mm/vmscan.c b/mm/vmscan.c index 777af57fd8c8..d0a631a428a0 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2173,6 +2173,7 @@ static int kswapd(void *p) order = 0; for ( ; ; ) { unsigned long new_order; + int ret; prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE); new_order = pgdat->kswapd_max_order; @@ -2184,19 +2185,23 @@ static int kswapd(void *p) */ order = new_order; } else { - if (!freezing(current)) + if (!freezing(current) && !kthread_should_stop()) schedule(); order = pgdat->kswapd_max_order; } finish_wait(&pgdat->kswapd_wait, &wait); - if (!try_to_freeze()) { - /* We can speed up thawing tasks if we don't call - * balance_pgdat after returning from the refrigerator - */ + ret = try_to_freeze(); + if (kthread_should_stop()) + break; + + /* + * We can speed up thawing tasks if we don't call balance_pgdat + * after returning from the refrigerator + */ + if (!ret) balance_pgdat(pgdat, order); - } } return 0; } @@ -2451,6 +2456,17 @@ int kswapd_run(int nid) return ret; } +/* + * Called by memory hotplug when all memory in a node is offlined. + */ +void kswapd_stop(int nid) +{ + struct task_struct *kswapd = NODE_DATA(nid)->kswapd; + + if (kswapd) + kthread_stop(kswapd); +} + static int __init kswapd_init(void) { int nid; |