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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>
This commit is contained in:
Nadia Derbey 2008-04-29 01:00:43 -07:00 committed by Linus Torvalds
parent b6b337ad1c
commit 424450c1db
1 changed files with 14 additions and 1 deletions
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15
ipc/util.c
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@ -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: