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| author |   Chris Mason <chris.mason@oracle.com> | 2008-06-11 20:21:24 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 11:04:03 -0400 |
| commit | 35d8ba66294ff2a53c17337a1aa1ff6739492f41 (patch) | |
| tree | 40297c7917bb0425e76030e54418a934b1225299 /fs/btrfs/async-thread.h | |
| parent | Btrfs: Add backport for the kthread work on kernels older than 2.6.20 (diff) | |
| download | linux-dev-35d8ba66294ff2a53c17337a1aa1ff6739492f41.tar.xz linux-dev-35d8ba66294ff2a53c17337a1aa1ff6739492f41.zip | |
Btrfs: Worker thread optimizations
This changes the worker thread pool to maintain a list of idle threads,
avoiding a complex search for a good thread to wake up.
Threads have two states:
idle - we try to reuse the last thread used in hopes of improving the batching
ratios
busy - each time a new work item is added to a busy task, the task is
rotated to the end of the line.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/async-thread.h')
| -rw-r--r-- | fs/btrfs/async-thread.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h index 52fc9da0f9e7..3436ff897597 100644 --- a/fs/btrfs/async-thread.h +++ b/fs/btrfs/async-thread.h @@ -60,11 +60,12 @@ struct btrfs_workers { /* max number of workers allowed. changed by btrfs_start_workers */ int max_workers; + /* once a worker has this many requests or fewer, it is idle */ + int idle_thresh; + /* list with all the work threads */ struct list_head worker_list; - - /* the last worker thread to have something queued */ - struct btrfs_worker_thread *last; + struct list_head idle_list; /* lock for finding the next worker thread to queue on */ spinlock_t lock; |