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    Subject[PATCH] [2/4] SLAB: Set up the l3 lists for the memory of freshly added memory
    Date

    So kmalloc_node() works even if no CPU is up yet on the new node.

    Requires previous refactor patch.

    Signed-off-by: Andi Kleen <ak@linux.intel.com>

    ---
    mm/slab.c | 17 +++++++++++++++++
    1 file changed, 17 insertions(+)

    Index: linux-2.6.33-rc3-ak/mm/slab.c
    ===================================================================
    --- linux-2.6.33-rc3-ak.orig/mm/slab.c
    +++ linux-2.6.33-rc3-ak/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>
    @@ -1560,6 +1561,20 @@ 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)
    + slab_node_prepare(mn->status_change_nid);
    + return NOTIFY_OK;
    +}
    +
    void __init kmem_cache_init_late(void)
    {
    struct kmem_cache *cachep;
    @@ -1583,6 +1598,8 @@ 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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