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* modules/spl/spl-kmem.c : Make sure to disable interrupts

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when necessary to avoid deadlocks.  We were seeing the deadlock
        when calling kmem_cache_generic_constructor() and then an interrupt
        forced us to end up calling kmem_cache_generic_destructor()
        which caused our deadlock.


git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@74 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
This commit is contained in:
wartens2 2008-04-16 16:37:51 +00:00
parent d61e12af5a
commit 55152ebbb4
2 changed files with 29 additions and 14 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2008-04-16 Herb Wartens <wartens2@llnl.gov>
* modules/spl/spl-kmem.c : Make sure to disable interrupts
when necessary to avoid deadlocks. We were seeing the deadlock
when calling kmem_cache_generic_constructor() and then an interrupt
forced us to end up calling kmem_cache_generic_destructor()
which caused our deadlock.
2008-02-26 Brian Behlendorf <behlendorf1@llnl.gov>
: Initial commit of the solaris porting layer (spl). Included

35
modules/spl/spl-kmem.c
View File

@ -77,6 +77,7 @@ kmem_cache_add_cache_cb(kmem_cache_t *cache,
void *priv, void *vmp)
{
kmem_cache_cb_t *kcc;
unsigned long flags;
kcc = (kmem_cache_cb_t *)kmalloc(sizeof(*kcc), GFP_KERNEL);
if (kcc) {
@ -86,9 +87,9 @@ kmem_cache_add_cache_cb(kmem_cache_t *cache,
kcc->kcc_reclaim = reclaim;
kcc->kcc_private = priv;
kcc->kcc_vmp = vmp;
spin_lock(&kmem_cache_cb_lock);
spin_lock_irqsave(&kmem_cache_cb_lock, flags);
list_add(&kcc->kcc_list, &kmem_cache_cb_list);
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, flags);
}
return kcc;
@ -97,9 +98,11 @@ kmem_cache_add_cache_cb(kmem_cache_t *cache,
static void
kmem_cache_remove_cache_cb(kmem_cache_cb_t *kcc)
{
spin_lock(&kmem_cache_cb_lock);
unsigned long flags;
spin_lock_irqsave(&kmem_cache_cb_lock, flags);
list_del(&kcc->kcc_list);
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, flags);
if (kcc)
kfree(kcc);
@ -110,9 +113,10 @@ kmem_cache_generic_constructor(void *ptr, kmem_cache_t *cache, unsigned long fla
{
kmem_cache_cb_t *kcc;
kmem_constructor_t constructor;
unsigned long irqflags;
void *private;
spin_lock(&kmem_cache_cb_lock);
spin_lock_irqsave(&kmem_cache_cb_lock, irqflags);
/* Callback list must be in sync with linux slab caches */
kcc = kmem_cache_find_cache_cb(cache);
@ -120,7 +124,7 @@ kmem_cache_generic_constructor(void *ptr, kmem_cache_t *cache, unsigned long fla
constructor = kcc->kcc_constructor;
private = kcc->kcc_private;
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, irqflags);
if (constructor)
constructor(ptr, private, (int)flags);
@ -133,9 +137,10 @@ kmem_cache_generic_destructor(void *ptr, kmem_cache_t *cache, unsigned long flag
{
kmem_cache_cb_t *kcc;
kmem_destructor_t destructor;
unsigned long irqflags;
void *private;
spin_lock(&kmem_cache_cb_lock);
spin_lock_irqsave(&kmem_cache_cb_lock, irqflags);
/* Callback list must be in sync with linux slab caches */
kcc = kmem_cache_find_cache_cb(cache);
@ -143,7 +148,7 @@ kmem_cache_generic_destructor(void *ptr, kmem_cache_t *cache, unsigned long flag
destructor = kcc->kcc_destructor;
private = kcc->kcc_private;
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, irqflags);
/* Solaris destructor takes no flags, silently eat them */
if (destructor)
@ -155,6 +160,7 @@ static int
kmem_cache_generic_shrinker(int nr_to_scan, unsigned int gfp_mask)
{
kmem_cache_cb_t *kcc;
unsigned long flags;
int total = 0;
/* Under linux a shrinker is not tightly coupled with a slab
@ -164,7 +170,7 @@ kmem_cache_generic_shrinker(int nr_to_scan, unsigned int gfp_mask)
* function in the shim layer for all slab caches. And we always
* attempt to shrink all caches when this generic shrinker is called.
*/
spin_lock(&kmem_cache_cb_lock);
spin_lock_irqsave(&kmem_cache_cb_lock, flags);
list_for_each_entry(kcc, &kmem_cache_cb_list, kcc_list) {
/* Under linux the desired number and gfp type of objects
@ -185,7 +191,7 @@ kmem_cache_generic_shrinker(int nr_to_scan, unsigned int gfp_mask)
* was registered with the generic shrinker. This should fake out
* the linux VM when it attempts to shrink caches.
*/
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, flags);
return total;
}
@ -257,11 +263,12 @@ __kmem_cache_destroy(kmem_cache_t *cache)
{
kmem_cache_cb_t *kcc;
char *name;
unsigned long flags;
int rc;
spin_lock(&kmem_cache_cb_lock);
spin_lock_irqsave(&kmem_cache_cb_lock, flags);
kcc = kmem_cache_find_cache_cb(cache);
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, flags);
if (kcc == NULL)
return -EINVAL;
@ -271,11 +278,11 @@ __kmem_cache_destroy(kmem_cache_t *cache)
kfree(name);
/* Unregister generic shrinker on removal of all caches */
spin_lock(&kmem_cache_cb_lock);
spin_lock_irqsave(&kmem_cache_cb_lock, flags);
if (list_empty(&kmem_cache_cb_list))
remove_shrinker(kmem_cache_shrinker);
spin_unlock(&kmem_cache_cb_lock);
spin_unlock_irqrestore(&kmem_cache_cb_lock, flags);
return rc;
}
EXPORT_SYMBOL(__kmem_cache_destroy);