linux-kernel - Re: blk-mq breaks suspend even with runtime PM patch

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Date:   Tue, 08 Aug 2017 18:34:01 +0200
From:   Mike Galbraith <efault@....de>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: blk-mq breaks suspend even with runtime PM patch

On Tue, 2017-08-08 at 09:22 -0700, Greg KH wrote:
> On Sun, Jul 30, 2017 at 03:50:15PM +0200, Oleksandr Natalenko wrote:
> > Hello Mike et al.
> > 
> > On neděle 30. července 2017 7:12:31 CEST Mike Galbraith wrote:
> > > FWIW, first thing I'd do is update that 4.12.0 to 4.12.4, and see if
> > > stable fixed it.
> > 
> > My build already includes v4.12.4.
> > 
> > > If not, I'd find these two commits irresistible.
> > > 
> > > 5f042e7cbd9eb blk-mq: Include all present CPUs in the default queue mapping
> > > 4b855ad37194f blk-mq: Create hctx for each present CPU
> > 
> > I've applied these 2 commits, and cannot reproduce the issue anymore. Looks 
> > like a perfect hit, thanks!
> > 
> > > 'course applying random upstream bits does come with some risk, trying
> > > a kernel already containing them has less "entertainment" potential. 
> > 
> > Should you consider applying them to v4.12.x stable series? CC'ing Greg just 
> > in case.
> 
> I can queue these up if I get an ack from the developers/maintainers
> that it is ok to do so...
> 
> {hint}

{hint++}

Those commits take Steven Rostedt's hotplug stress script runtime down
from 4 _minutes_ down to 7 seconds for my RT tree, so I'm rather hoping
you hear an "ACK" too.

	-Mike