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2023 Jun 06
2
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
...SIGKILL,
> > and thread0 can flush the outstanding commands when it calls vhost_dev_flush()
> > rather than wait for vhost_worker().
> >
> > Right?
>
> With the current code, the answer is no. We would hang like I mentioned here:
>
> https://lore.kernel.org/lkml/ae250076-7d55-c407-1066-86b37014c69c at oracle.com/
If only I could fully understand this email ;)
Could you spell to explain why this can't work (again, in this simple case) ?
My current (and I know, very poor) understanding is that .release() should
roughly do the following:
1. Ensure that vhost_...
2023 Jun 06
1
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
...se vhost_worker() can just exit after SIGKILL,
> and thread0 can flush the outstanding commands when it calls vhost_dev_flush()
> rather than wait for vhost_worker().
>
> Right?
With the current code, the answer is no. We would hang like I mentioned here:
https://lore.kernel.org/lkml/ae250076-7d55-c407-1066-86b37014c69c at oracle.com/
We need to add code like I mentioned in that reply because we don't have a
way to call into the layers below us to flush those commands. We need more
like an abort and don't call back into us type of operation. Or, I'm just trying
to add a che...
2023 Jun 06
1
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
On 06/05, Mike Christie wrote:
>
> On 6/5/23 10:10 AM, Oleg Nesterov wrote:
> > On 06/03, michael.christie at oracle.com wrote:
> >>
> >> On 6/2/23 11:15 PM, Eric W. Biederman wrote:
> >> The problem is that as part of the flush the drivers/vhost/scsi.c code
> >> will wait for outstanding commands, because we can't free the device and
>