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SLOW_WORK: Add delayed_slow_work support

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This adds support for starting slow work with a delay, similar
to the functionality we have for workqueues.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Jens Axboe
2009-11-19 18:10:47 +00:00
committed by David Howells
parent 0160950297
commit 6b8268b17a
3 changed files with 171 additions and 3 deletions
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16
Documentation/slow-work.txt
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@ -41,6 +41,13 @@ expand files, provided the time taken to do so isn't too long.
Operations of both types may sleep during execution, thus tying up the thread
loaned to it.
A further class of work item is available, based on the slow work item class:
(*) Delayed slow work items.
These are slow work items that have a timer to defer queueing of the item for
a while.
THREAD-TO-CLASS ALLOCATION
--------------------------
@ -93,6 +100,10 @@ Slow work items may then be set up by:
slow_work_init(&myitem, &myitem_ops);
or:
delayed_slow_work_init(&myitem, &myitem_ops);
or:
vslow_work_init(&myitem, &myitem_ops);
@ -104,7 +115,9 @@ A suitably set up work item can then be enqueued for processing:
int ret = slow_work_enqueue(&myitem);
This will return a -ve error if the thread pool is unable to gain a reference
on the item, 0 otherwise.
on the item, 0 otherwise, or (for delayed work):
int ret = delayed_slow_work_enqueue(&myitem, my_jiffy_delay);
The items are reference counted, so there ought to be no need for a flush
@ -112,6 +125,7 @@ operation. But as the reference counting is optional, means to cancel
existing work items are also included:
cancel_slow_work(&myitem);
cancel_delayed_slow_work(&myitem);
can be used to cancel pending work. The above cancel function waits for
existing work to have been executed (or prevent execution of them, depending