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| author | Nadia Derbey <Nadia.Derbey@bull.net> | 2008-04-29 10:00:43 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 17:06:12 +0200 |
| commit | 424450c1dbe72b6e2637e91108417d7d9580c4c3 (patch) | |
| tree | 472fd07a519cdfd594a15da5d2167d8de937e95e /ipc/util.c | |
| parent | ipc: recompute msgmni on memory add / remove (diff) | |
| download | linux-424450c1dbe72b6e2637e91108417d7d9580c4c3.tar.xz linux-424450c1dbe72b6e2637e91108417d7d9580c4c3.zip | |
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/util.c')
| -rw-r--r-- | ipc/util.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/ipc/util.c b/ipc/util.c index 2d545d7144a7..7a5d5e393c4b 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: |