Re: [PATCH v2] sched/completion: convert completions to use simple wait queues

[Daniel Wagner]

On 04/28/2016 02:57 PM, Daniel Wagner wrote:
> Only one complete_all() user could been identified so far, which happens
> to be drivers/base/power/main.c. Several waiters appear when suspend
> to disk or mem is executed.

BTW, this is what I get when doing a 'echo "disk" > /sys/power/state' on
a 4 socket E5-4610 (Ivy Bridge EP) system.


swait_stat version 0.1
---------------------------------------------------------------------------------------------
                              class name     1 waiter    2 waiters    3 waiters   4+ waiters
---------------------------------------------------------------------------------------------
[...]
                             &x->wait#12           90           11            5            1
         [<ffffffff815dd462>] dpm_wait+0x32/0x40
                                                   20          [<ffffffff815de5d4>] __device_suspend+0x1b4/0x370
                                                    4          [<ffffffff815de1e4>] __device_suspend_late+0x74/0x210
                                                   22          [<ffffffff815ddf21>] __device_suspend_noirq+0x51/0x200
                                                    2          [<ffffffff815ddaf9>] device_resume_early+0x69/0x1b0
                                                   59          [<ffffffff815ddce0>] device_resume+0x50/0x1f0
[...]