Hi,
the commit (found by bisect)
commit 18a25da84354c6bb655320de6072c00eda6eb602
Author: NeilBrown
Date: Wed Sep 6 09:43:28 2017 +1000
dm: ensure bio submission follows a depth-first tree walk
cause serious regression while reading from DM device.
The reproducer is below, basicall
On Wed, Feb 14 2018, Milan Broz wrote:
> Hi,
>
> the commit (found by bisect)
>
> commit 18a25da84354c6bb655320de6072c00eda6eb602
> Author: NeilBrown
> Date: Wed Sep 6 09:43:28 2017 +1000
>
> dm: ensure bio submission follows a depth-first tree walk
>
> cause serious regression while
On Wed, Feb 14 2018 at 3:39pm -0500,
NeilBrown wrote:
> On Wed, Feb 14 2018, Milan Broz wrote:
>
> > Hi,
> >
> > the commit (found by bisect)
> >
> > commit 18a25da84354c6bb655320de6072c00eda6eb602
> > Author: NeilBrown
> > Date: Wed Sep 6 09:43:28 2017 +1000
> >
> > dm: ensure bio
On Wed, Feb 14 2018, Mike Snitzer wrote:
> On Wed, Feb 14 2018 at 3:39pm -0500,
> NeilBrown wrote:
>
>> On Wed, Feb 14 2018, Milan Broz wrote:
>>
>> > Hi,
>> >
>> > the commit (found by bisect)
>> >
>> > commit 18a25da84354c6bb655320de6072c00eda6eb602
>> > Author: NeilBrown
>> > Date:
On 02/15/2018 01:07 AM, NeilBrown wrote:
>
> And looking again at the code, it doesn't seem so bad. I was worried
> about reassigning ci.io->orig_bio after calling
> __split_and_process_non_flush(), but the important thing is to set it
> before the last dec_pending() call, and the code gets that
