The patch titled ipc: invoke the ipcns notifier chain as a work item has been removed from the -mm tree. Its filename was ipc-invoke-the-ipcns-notifier-chain-as-a-work-item.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: ipc: invoke the ipcns notifier chain as a work item From: Nadia Derbey <Nadia.Derbey@xxxxxxxx> 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@xxxxxxxx> Cc: Yasunori Goto <y-goto@xxxxxxxxxxxxxx> Cc: Matt Helsley <matthltc@xxxxxxxxxx> Cc: Mingming Cao <cmm@xxxxxxxxxx> Cc: Pierre Peiffer <pierre.peiffer@xxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- ipc/util.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff -puN ipc/util.c~ipc-invoke-the-ipcns-notifier-chain-as-a-work-item ipc/util.c --- a/ipc/util.c~ipc-invoke-the-ipcns-notifier-chain-as-a-work-item +++ a/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 no /* * 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: _ Patches currently in -mm which might be from Nadia.Derbey@xxxxxxxx are origin.patch idr-fix-idr_remove.patch idr-introduce-the-ridr-structure.patch idr-introduce-ridr_pre_get.patch idr-introduce-ridr_init.patch idr-introduce-ridr_get_new_above.patch idr-introduce-ridr_get_new.patch idr-introduce-ridr_find.patch idr-introduce-ridr_remove.patch ipc-integrate-the-ridr-code-into-ipc-code.patch ipc-get-rid-of-ipc_lock_down.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html