Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [3/4] SLAB: Set up the l3 lists for the memory of freshly added memory v2 | Date | Thu, 11 Feb 2010 21:54:03 +0100 (CET) |
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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 <ak@linux.intel.com>
--- 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 <linux/reciprocal_div.h> #include <linux/debugobjects.h> #include <linux/kmemcheck.h> +#include <linux/memory.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> @@ -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.
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