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authorNick Piggin <npiggin@suse.de>2009-09-15 21:34:12 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-16 15:18:52 +0200
commit77fad5e625e56eb31a343ae1d489979fdc61a2aa (patch)
treee0b881a38be27d0c4d8523289f51b70ffb98c080 /fs/fs-writeback.c
parentdeed62edffe600bc5b379c872d3004116e001b66 (diff)
writeback: improve scalability of bdi writeback work queues
If you're going to do an atomic RMW on each list entry, there's not much point in all the RCU complexities of the list walking. This is only going to help the multi-thread case I guess, but it doesn't hurt to do now. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 59c99e729187..6bca6f8176f0 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -772,8 +772,9 @@ static struct bdi_work *get_next_work_item(struct backing_dev_info *bdi,
rcu_read_lock();
list_for_each_entry_rcu(work, &bdi->work_list, list) {
- if (!test_and_clear_bit(wb->nr, &work->seen))
+ if (!test_bit(wb->nr, &work->seen))
continue;
+ clear_bit(wb->nr, &work->seen);
ret = work;
break;