lkml.org 
[lkml]   [2018]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] nvme-pci: drain the entered requests after ctrl is shutdown
From
Date
Hi Keith andn Sagi

Thanks for your kindly response and comment on this.

On 02/13/2018 03:15 AM, Keith Busch wrote:
> On Mon, Feb 12, 2018 at 08:43:58PM +0200, Sagi Grimberg wrote:
>>
>>> Currently, we will unquiesce the queues after the controller is
>>> shutdown to avoid residual requests to be stuck. In fact, we can
>>> do it more cleanly, just wait freeze and drain the queue in
>>> nvme_dev_disable and finally leave the queues quiesced.
>>
>> Does this fix a bug? What is the benefit of leaving the queues
>> quiesced in shutdown?
>
> This doesn't appear to fix anything. The things this patch does do are
> either unnecessary (quiece), or already done elsewhere (wait freeze).
>

Yes, this patch doesn't fix any bug. Since we will let the request to be drained
for shutdown case to avoid to be stuck, why not do it in nvme_dev_disable and
then quiesce the queue again. In nvme_dev_disable, we unquiesce the queues finally,
it looks really something odd. And always give me a feeling that something is still
ongoing and not completed....It looks like something is leaking.... ;)

Why not we complete it in nvme_dev_disable ?

Thanks
Jianchao


\
 
 \ /
  Last update: 2018-02-13 02:51    [W:0.047 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site