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Btrfs: Allow worker threads to exit when idle

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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>
This commit is contained in:
Chris Mason 2009-08-04 16:56:34 -04:00
commit 9042846bc7
3 changed files with 132 additions and 32 deletions
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9
fs/btrfs/async-thread.h
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@ -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.