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authorJens Axboe <axboe@suse.de>2006-03-28 08:59:01 +0200
committerJens Axboe <axboe@suse.de>2006-03-28 08:59:01 +0200
commite2d74ac0664c89757bde8fb18c98cd7bf53da61c (patch)
tree1e858044a9180766eae4ec694d4200c4ae850406 /block/ll_rw_blk.c
parent329b10bb0feacb7fb9a41389313ff0a51ae56f2a (diff)
[PATCH] [BLOCK] cfq-iosched: change cfq io context linking from list to tree
On setups with many disks, we spend a considerable amount of time looking up the process-disk mapping on each queue of io. Testing with a NULL based block driver, this costs 40-50% reduction in throughput for 1000 disks. Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/ll_rw_blk.c')
-rw-r--r--block/ll_rw_blk.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 82469db2510..cb608768ca3 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3539,11 +3539,15 @@ void put_io_context(struct io_context *ioc)
BUG_ON(atomic_read(&ioc->refcount) == 0);
if (atomic_dec_and_test(&ioc->refcount)) {
+ struct cfq_io_context *cic;
+
rcu_read_lock();
if (ioc->aic && ioc->aic->dtor)
ioc->aic->dtor(ioc->aic);
- if (ioc->cic && ioc->cic->dtor)
- ioc->cic->dtor(ioc->cic);
+ if (ioc->cic_root.rb_node != NULL) {
+ cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context, rb_node);
+ cic->dtor(ioc);
+ }
rcu_read_unlock();
kmem_cache_free(iocontext_cachep, ioc);
@@ -3556,6 +3560,7 @@ void exit_io_context(void)
{
unsigned long flags;
struct io_context *ioc;
+ struct cfq_io_context *cic;
local_irq_save(flags);
task_lock(current);
@@ -3567,9 +3572,11 @@ void exit_io_context(void)
if (ioc->aic && ioc->aic->exit)
ioc->aic->exit(ioc->aic);
- if (ioc->cic && ioc->cic->exit)
- ioc->cic->exit(ioc->cic);
-
+ if (ioc->cic_root.rb_node != NULL) {
+ cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context, rb_node);
+ cic->exit(ioc);
+ }
+
put_io_context(ioc);
}
@@ -3598,7 +3605,7 @@ struct io_context *current_io_context(gfp_t gfp_flags)
ret->last_waited = jiffies; /* doesn't matter... */
ret->nr_batch_requests = 0; /* because this is 0 */
ret->aic = NULL;
- ret->cic = NULL;
+ ret->cic_root.rb_node = NULL;
tsk->io_context = ret;
}