summaryrefslogtreecommitdiff
path: root/mm/backing-dev.c
diff options
context:
space:
mode:
authorJens Axboe <jens.axboe@oracle.com>2009-04-06 14:48:01 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-06 08:04:53 -0700
commit1faa16d22877f4839bd433547d770c676d1d964c (patch)
tree9a0d50be1ef0358c1f53d7107413100904e7d526 /mm/backing-dev.c
parent0221c81b1b8eb0cbb6b30a0ced52ead32d2b4e4c (diff)
downloadconfigs-1faa16d22877f4839bd433547d770c676d1d964c.tar.gz
block: change the request allocation/congestion logic to be sync/async based
This makes sure that we never wait on async IO for sync requests, instead of doing the split on writes vs reads. Signed-off-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index be68c956a66..493b468a503 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -284,12 +284,12 @@ static wait_queue_head_t congestion_wqh[2] = {
};
-void clear_bdi_congested(struct backing_dev_info *bdi, int rw)
+void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
{
enum bdi_state bit;
- wait_queue_head_t *wqh = &congestion_wqh[rw];
+ wait_queue_head_t *wqh = &congestion_wqh[sync];
- bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
+ bit = sync ? BDI_sync_congested : BDI_async_congested;
clear_bit(bit, &bdi->state);
smp_mb__after_clear_bit();
if (waitqueue_active(wqh))
@@ -297,11 +297,11 @@ void clear_bdi_congested(struct backing_dev_info *bdi, int rw)
}
EXPORT_SYMBOL(clear_bdi_congested);
-void set_bdi_congested(struct backing_dev_info *bdi, int rw)
+void set_bdi_congested(struct backing_dev_info *bdi, int sync)
{
enum bdi_state bit;
- bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
+ bit = sync ? BDI_sync_congested : BDI_async_congested;
set_bit(bit, &bdi->state);
}
EXPORT_SYMBOL(set_bdi_congested);