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staging: zcache: optimize zcache_do_preload

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zcache_do_preload is called in zcache_put_page where IRQ is disabled, so, need
not care preempt

Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiao Guangrong 2012-06-26 16:51:34 +08:00 committed by Greg Kroah-Hartman
parent dc2f9a5d3d
commit 79c0d92c5b
1 changed files with 9 additions and 12 deletions
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21
drivers/staging/zcache/zcache-main.c
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@ -1031,45 +1031,43 @@ static int zcache_do_preload(struct tmem_pool *pool)
goto out;
if (unlikely(zcache_obj_cache == NULL))
goto out;
preempt_disable();
/* IRQ has already been disabled. */
kp = &__get_cpu_var(zcache_preloads);
while (kp->nr < ARRAY_SIZE(kp->objnodes)) {
preempt_enable_no_resched();
objnode = kmem_cache_alloc(zcache_objnode_cache,
ZCACHE_GFP_MASK);
if (unlikely(objnode == NULL)) {
zcache_failed_alloc++;
goto out;
}
preempt_disable();
kp = &__get_cpu_var(zcache_preloads);
if (kp->nr < ARRAY_SIZE(kp->objnodes))
kp->objnodes[kp->nr++] = objnode;
else
kmem_cache_free(zcache_objnode_cache, objnode);
kp->objnodes[kp->nr++] = objnode;
}
preempt_enable_no_resched();
obj = kmem_cache_alloc(zcache_obj_cache, ZCACHE_GFP_MASK);
if (unlikely(obj == NULL)) {
zcache_failed_alloc++;
goto out;
}
page = (void *)__get_free_page(ZCACHE_GFP_MASK);
if (unlikely(page == NULL)) {
zcache_failed_get_free_pages++;
kmem_cache_free(zcache_obj_cache, obj);
goto out;
}
preempt_disable();
kp = &__get_cpu_var(zcache_preloads);
if (kp->obj == NULL)
kp->obj = obj;
else
kmem_cache_free(zcache_obj_cache, obj);
if (kp->page == NULL)
kp->page = page;
else
free_page((unsigned long)page);
ret = 0;
out:
return ret;
@ -1580,7 +1578,6 @@ static int zcache_put_page(int cli_id, int pool_id, struct tmem_oid *oidp,
zcache_failed_pers_puts++;
}
zcache_put_pool(pool);
preempt_enable_no_resched();
} else {
zcache_put_to_flush++;
if (atomic_read(&pool->obj_count) > 0)