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    SubjectRe: [PATCH] [3/4] SLAB: Set up the l3 lists for the memory of freshly added memory v2
    On Thu, Feb 11, 2010 at 01:45:16PM -0800, David Rientjes wrote:
    > On Thu, 11 Feb 2010, Andi Kleen wrote:
    >
    > > 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);
    > > +
    >
    > Only needed for CONFIG_NUMA, but there's no side-effects for UMA kernels
    > since status_change_nid will always be -1.

    Compiler doesn't know that, though.

    >
    > Acked-by: David Rientjes <rientjes@google.com>


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