From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with ESMTP id 3C14F6B0078 for ; Thu, 11 Feb 2010 15:54:07 -0500 (EST) From: Andi Kleen References: <20100211953.850854588@firstfloor.org> In-Reply-To: <20100211953.850854588@firstfloor.org> Subject: [PATCH] [3/4] SLAB: Set up the l3 lists for the memory of freshly added memory v2 Message-Id: <20100211205403.05A8EB1978@basil.firstfloor.org> Date: Thu, 11 Feb 2010 21:54:03 +0100 (CET) Sender: owner-linux-mm@kvack.org To: penberg@cs.helsinki.fi, linux-kernel@vger.kernel.org, linux-mm@kvack.org, haicheng.li@intel.com, rientjes@google.com List-ID: So kmalloc_node() works even if no CPU is up yet on the new node. v2: Take cache chain mutex Signed-off-by: Andi Kleen --- mm/slab.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) Index: linux-2.6.32-memhotadd/mm/slab.c =================================================================== --- linux-2.6.32-memhotadd.orig/mm/slab.c +++ linux-2.6.32-memhotadd/mm/slab.c @@ -115,6 +115,7 @@ #include #include #include +#include #include #include @@ -1554,6 +1555,23 @@ void __init kmem_cache_init(void) g_cpucache_up = EARLY; } +static int slab_memory_callback(struct notifier_block *self, + unsigned long action, void *arg) +{ + struct memory_notify *mn = (struct memory_notify *)arg; + + /* + * When a node goes online allocate l3s early. This way + * kmalloc_node() works for it. + */ + if (action == MEM_ONLINE && mn->status_change_nid >= 0) { + mutex_lock(&cache_chain_mutex); + slab_node_prepare(mn->status_change_nid); + mutex_unlock(&cache_chain_mutex); + } + return NOTIFY_OK; +} + void __init kmem_cache_init_late(void) { struct kmem_cache *cachep; @@ -1577,6 +1595,8 @@ void __init kmem_cache_init_late(void) */ register_cpu_notifier(&cpucache_notifier); + hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); + /* * The reap timers are started later, with a module init call: That part * of the kernel is not yet operational. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org