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authorNadia Derbey <Nadia.Derbey@bull.net>2008-04-29 01:00:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:12 -0700
commit424450c1dbe72b6e2637e91108417d7d9580c4c3 (patch)
tree472fd07a519cdfd594a15da5d2167d8de937e95e /ipc
parentb6b337ad1c1d6fe11b09b35d75464b84b3e11f07 (diff)
downloadconfigs-424450c1dbe72b6e2637e91108417d7d9580c4c3.tar.gz
ipc: invoke the ipcns notifier chain as a work item
Make the memory hotplug chain's mutex held for a shorter time: when memory is offlined or onlined a work item is added to the global workqueue. When the work item is run, it notifies the ipcns notifier chain with the IPCNS_MEMCHANGED event. Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Mingming Cao <cmm@us.ibm.com> Cc: Pierre Peiffer <pierre.peiffer@bull.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/util.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/ipc/util.c b/ipc/util.c
index 2d545d7144a..7a5d5e393c4 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -58,6 +58,14 @@ atomic_t nr_ipc_ns = ATOMIC_INIT(1);
#ifdef CONFIG_MEMORY_HOTPLUG
+static void ipc_memory_notifier(struct work_struct *work)
+{
+ ipcns_notify(IPCNS_MEMCHANGED);
+}
+
+static DECLARE_WORK(ipc_memory_wq, ipc_memory_notifier);
+
+
static int ipc_memory_callback(struct notifier_block *self,
unsigned long action, void *arg)
{
@@ -67,8 +75,13 @@ static int ipc_memory_callback(struct notifier_block *self,
/*
* This is done by invoking the ipcns notifier chain with the
* IPC_MEMCHANGED event.
+ * In order not to keep the lock on the hotplug memory chain
+ * for too long, queue a work item that will, when waken up,
+ * activate the ipcns notification chain.
+ * No need to keep several ipc work items on the queue.
*/
- ipcns_notify(IPCNS_MEMCHANGED);
+ if (!work_pending(&ipc_memory_wq))
+ schedule_work(&ipc_memory_wq);
break;
case MEM_GOING_ONLINE:
case MEM_GOING_OFFLINE: