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Btrfs: Worker thread optimizations

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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>
This commit is contained in:
Chris Mason 2008-06-11 20:21:24 -04:00
parent d05e5a4dad
commit 35d8ba6629
2 changed files with 73 additions and 34 deletions
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7
fs/btrfs/async-thread.h
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@ -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;