Commit acb7aa0d authored Feb 04, 2013 by Arjan van de Ven Committed by Matthew Wilcox Apr 16, 2013

NVMe: Use round_jiffies_relative() for the periodic, once-per-second timer



The nvme driver has a "once per second" event where the management kthread
wakes up the system and then reschedules itself for 1 second later.
For power efficiency reasons, I'd like this timer to happen together
with other wakeups in the system.

This patch makes the schedule_timeout() call in the kthread use
round_jiffies_relative(), causing the wakeup to at least align with other
"once per X seconds" events in the kernel.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Tested-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

parent 5d0f6131

drivers/block/nvme-core.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -1309,7 +1309,7 @@ static int nvme_kthread(void *data)
	}		}
	spin_unlock(&dev_list_lock);		spin_unlock(&dev_list_lock);
	set_current_state(TASK_INTERRUPTIBLE);		set_current_state(TASK_INTERRUPTIBLE);
	schedule_timeout(HZ);		schedule_timeout(round_jiffies_relative(HZ));
	}		}
	return 0;		return 0;
	}		}