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Message-ID: <20110214130954.GI18742@htj.dyndns.org> Date: Mon, 14 Feb 2011 14:09:54 +0100 From: Tejun Heo <tj@...nel.org> To: Ray Jui <rjui@...adcom.com> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: [PATCH wq#fixes-2.6.38] workqueue: wake up a worker when a rescuer is leaving a gcwq After executing the matching works, a rescuer leaves the gcwq whether there are more pending works or not. This may decrease the concurrency level to zero and stall execution until a new work item is queued on the gcwq. Make rescuer wake up a regular worker when it leaves a gcwq if there are more works to execute, so that execution isn't stalled. Signed-off-by: Tejun Heo <tj@...nel.org> Reported-by: Ray Jui <rjui@...adcom.com> Cc: stable@...nel.org --- kernel/workqueue.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 11869fa..90a17ca 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -2047,6 +2047,15 @@ repeat: move_linked_works(work, scheduled, &n); process_scheduled_works(rescuer); + + /* + * Leave this gcwq. If keep_working() is %true, notify a + * regular worker; otherwise, we end up with 0 concurrency + * and stalling the execution. + */ + if (keep_working(gcwq)) + wake_up_worker(gcwq); + spin_unlock_irq(&gcwq->lock); } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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