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>

1 files changed, 22 insertions, 6 deletions

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;