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authorTejun Heo <tj@kernel.org>2011-12-14 00:33:42 +0100
committerJens Axboe <axboe@kernel.dk>2011-12-14 00:33:42 +0100
commit3d3c2379feb177a5fd55bb0ed76776dc9d4f3243 (patch)
treefafebbef8f0fb5b73ac4db24bff20dcd40b8bf12 /block/cfq-iosched.c
parent47fdd4ca96bf4b28ac4d05d7a6e382df31d3d758 (diff)
block, cfq: move icq cache management to block core
Let elevators set ->icq_size and ->icq_align in elevator_type and elv_register() and elv_unregister() respectively create and destroy kmem_cache for icq. * elv_register() now can return failure. All callers updated. * icq caches are automatically named "ELVNAME_io_cq". * cfq_slab_setup/kill() are collapsed into cfq_init/exit(). * While at it, minor indentation change for iosched_cfq.elevator_name for consistency. This will help moving icq management to block core. This doesn't introduce any functional change. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/cfq-iosched.c')
-rw-r--r--block/cfq-iosched.c48
1 files changed, 15 insertions, 33 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 048fa699adf..06e59abcb57 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3914,34 +3914,6 @@ static void *cfq_init_queue(struct request_queue *q)
return cfqd;
}
-static void cfq_slab_kill(void)
-{
- /*
- * Caller already ensured that pending RCU callbacks are completed,
- * so we should have no busy allocations at this point.
- */
- if (cfq_pool)
- kmem_cache_destroy(cfq_pool);
- if (cfq_icq_pool)
- kmem_cache_destroy(cfq_icq_pool);
-}
-
-static int __init cfq_slab_setup(void)
-{
- cfq_pool = KMEM_CACHE(cfq_queue, 0);
- if (!cfq_pool)
- goto fail;
-
- cfq_icq_pool = KMEM_CACHE(cfq_io_cq, 0);
- if (!cfq_icq_pool)
- goto fail;
-
- return 0;
-fail:
- cfq_slab_kill();
- return -ENOMEM;
-}
-
/*
* sysfs parts below -->
*/
@@ -4053,8 +4025,10 @@ static struct elevator_type iosched_cfq = {
.elevator_init_fn = cfq_init_queue,
.elevator_exit_fn = cfq_exit_queue,
},
+ .icq_size = sizeof(struct cfq_io_cq),
+ .icq_align = __alignof__(struct cfq_io_cq),
.elevator_attrs = cfq_attrs,
- .elevator_name = "cfq",
+ .elevator_name = "cfq",
.elevator_owner = THIS_MODULE,
};
@@ -4072,6 +4046,8 @@ static struct blkio_policy_type blkio_policy_cfq;
static int __init cfq_init(void)
{
+ int ret;
+
/*
* could be 0 on HZ < 1000 setups
*/
@@ -4086,10 +4062,17 @@ static int __init cfq_init(void)
#else
cfq_group_idle = 0;
#endif
- if (cfq_slab_setup())
+ cfq_pool = KMEM_CACHE(cfq_queue, 0);
+ if (!cfq_pool)
return -ENOMEM;
- elv_register(&iosched_cfq);
+ ret = elv_register(&iosched_cfq);
+ if (ret) {
+ kmem_cache_destroy(cfq_pool);
+ return ret;
+ }
+ cfq_icq_pool = iosched_cfq.icq_cache;
+
blkio_policy_register(&blkio_policy_cfq);
return 0;
@@ -4099,8 +4082,7 @@ static void __exit cfq_exit(void)
{
blkio_policy_unregister(&blkio_policy_cfq);
elv_unregister(&iosched_cfq);
- rcu_barrier(); /* make sure all cic RCU frees are complete */
- cfq_slab_kill();
+ kmem_cache_destroy(cfq_pool);
}
module_init(cfq_init);