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>

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 4ec9001..abce8a0 100644 (file)
--- 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 e8116f8..bc5a081 100644 (file)
--- 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 777af57..d0a631a 100644 (file)
--- 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;