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cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()

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This patch converts the known per-subsystem mutexes to get_online_cpus
put_online_cpus. It also eliminates the CPU_LOCK_ACQUIRE and
CPU_LOCK_RELEASE hotplug notification events.

Signed-off-by: Gautham  R Shenoy <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Gautham R Shenoy 2008-01-25 21:08:02 +01:00 • committed by Ingo Molnar
commit 95402b3829
5 changed files with 36 additions and 50 deletions
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18
mm/slab.c
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@ -730,8 +730,7 @@ static inline void init_lock_keys(void)
#endif
/*
* 1. Guard access to the cache-chain.
* 2. Protect sanity of cpu_online_map against cpu hotplug events
* Guard access to the cache-chain.
*/
static DEFINE_MUTEX(cache_chain_mutex);
static struct list_head cache_chain;
@ -1331,12 +1330,11 @@ static int __cpuinit cpuup_callback(struct notifier_block *nfb,
int err = 0;
switch (action) {
case CPU_LOCK_ACQUIRE:
mutex_lock(&cache_chain_mutex);
break;
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
mutex_lock(&cache_chain_mutex);
err = cpuup_prepare(cpu);
mutex_unlock(&cache_chain_mutex);
break;
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
@ -1373,9 +1371,8 @@ static int __cpuinit cpuup_callback(struct notifier_block *nfb,
#endif
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
mutex_lock(&cache_chain_mutex);
cpuup_canceled(cpu);
break;
case CPU_LOCK_RELEASE:
mutex_unlock(&cache_chain_mutex);
break;
}
@ -2170,6 +2167,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
* We use cache_chain_mutex to ensure a consistent view of
* cpu_online_map as well. Please see cpuup_callback
*/
get_online_cpus();
mutex_lock(&cache_chain_mutex);
list_for_each_entry(pc, &cache_chain, next) {
@ -2396,6 +2394,7 @@ oops:
panic("kmem_cache_create(): failed to create slab `%s'\n",
name);
mutex_unlock(&cache_chain_mutex);
put_online_cpus();
return cachep;
}
EXPORT_SYMBOL(kmem_cache_create);
@ -2547,9 +2546,11 @@ int kmem_cache_shrink(struct kmem_cache *cachep)
int ret;
BUG_ON(!cachep || in_interrupt());
get_online_cpus();
mutex_lock(&cache_chain_mutex);
ret = __cache_shrink(cachep);
mutex_unlock(&cache_chain_mutex);
put_online_cpus();
return ret;
}
EXPORT_SYMBOL(kmem_cache_shrink);
@ -2575,6 +2576,7 @@ void kmem_cache_destroy(struct kmem_cache *cachep)
BUG_ON(!cachep || in_interrupt());
/* Find the cache in the chain of caches. */
get_online_cpus();
mutex_lock(&cache_chain_mutex);
/*
* the chain is never empty, cache_cache is never destroyed
@ -2584,6 +2586,7 @@ void kmem_cache_destroy(struct kmem_cache *cachep)
slab_error(cachep, "Can't free all objects");
list_add(&cachep->next, &cache_chain);
mutex_unlock(&cache_chain_mutex);
put_online_cpus();
return;
}
@ -2592,6 +2595,7 @@ void kmem_cache_destroy(struct kmem_cache *cachep)
__kmem_cache_destroy(cachep);
mutex_unlock(&cache_chain_mutex);
put_online_cpus();
}
EXPORT_SYMBOL(kmem_cache_destroy);