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authorChris Mason <chris.mason@oracle.com>2009-08-04 16:56:34 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-11 13:30:56 -0400
commit9042846bc7ae69cc3288d85af6bad16208d93a95 (patch)
treed46077d217d31ce5600ef870c92fcdf330922b41 /fs/btrfs/async-thread.h
parentceab36edd3d3ad3ffd01d41d6d1e05ac1ff8357e (diff)
downloadlinux-9042846bc7ae69cc3288d85af6bad16208d93a95.tar.gz
Btrfs: Allow worker threads to exit when idle
The Btrfs worker threads don't currently die off after they have been idle for a while, leading to a lot of threads sitting around doing nothing for each mount. Also, they are unable to start atomically (from end_io hanlders). This commit reworks the worker threads so they can be started from end_io handlers (just setting a flag that asks for a thread to be added at a later date) and so they can exit if they have been idle for a long time. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/async-thread.h')
-rw-r--r--fs/btrfs/async-thread.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h
index 1b511c109db6..a562ad8d83aa 100644
--- a/fs/btrfs/async-thread.h
+++ b/fs/btrfs/async-thread.h
@@ -73,6 +73,15 @@ struct btrfs_workers {
/* force completions in the order they were queued */
int ordered;
+ /* more workers required, but in an interrupt handler */
+ int atomic_start_pending;
+
+ /*
+ * are we allowed to sleep while starting workers or are we required
+ * to start them at a later time?
+ */
+ int atomic_worker_start;
+
/* list with all the work threads. The workers on the idle thread
* may be actively servicing jobs, but they haven't yet hit the
* idle thresh limit above.