Revision 1d9e2ae949411c2f329f30e01ea0355cd02c4296 authored by Chris Mason on 16 January 2009, 16:58:19 UTC, committed by Chris Mason on 16 January 2009, 16:58:19 UTC
Btrfs maintains a queue of async bio submissions so the checksumming threads don't have to wait on get_request_wait. In order to avoid extra wakeups, this code has a running_pending flag that is used to tell new submissions they don't need to wake the thread. When the threads notice congestion on a single device, they may decide to requeue the job and move on to other devices. This makes sure the running_pending flag is cleared before the job is requeued. It should help avoid IO stalls by making sure the task is woken up when new submissions come in. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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