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Commit 424450c1 authored by Nadia Derbey's avatar Nadia Derbey Committed by Linus Torvalds
Browse files

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: default avatarNadia 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b6b337ad

ipc/util.c

+14 −1
Original line number Diff line number Diff line
@@ -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: