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2023 Jun 06
2
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
On 06/06, Mike Christie wrote:
>
> On 6/6/23 7:16 AM, Oleg Nesterov wrote:
> > On 06/05, Mike Christie wrote:
> >
> >> So it works like if we were using a kthread still:
> >>
> >> 1. Userapce thread0 opens /dev/vhost-$something.
> >> 2. thread0 does VHOST_SET_OWNER ioctl. This calls vhost_task_create() to
> >> create the task_struct which runs the vhost_worker() function which handles
> >> the work->fns.
> >> 3. If userspace now does a SIGKILL or...
2023 Jun 05
1
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
...ts created by
kernel/vhost_taskc.c:vhost_task_create()?
If so, then the answer is no. vhost_task_create has set the no_files
arg on kernel_clone_args, so copy_files() sets task_struct->files to NULL
and we don't clone or dup the files.
So it works like if we were using a kthread still:
1. Userapce thread0 opens /dev/vhost-$something.
2. thread0 does VHOST_SET_OWNER ioctl. This calls vhost_task_create() to
create the task_struct which runs the vhost_worker() function which handles
the work->fns.
3. If userspace now does a SIGKILL or just exits without doing a close() on
/dev/vhost-$someth...
2023 Jun 06
1
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
...'m misunderstanding the sub-thread term.
>
> - Is it the task_struct's context that we did the
> kernel/vhost_taskc.c:vhost_task_create() from? Below it would be the
> thread we did VHOST_SET_OWNER from.
Yes,
> So it works like if we were using a kthread still:
>
> 1. Userapce thread0 opens /dev/vhost-$something.
> 2. thread0 does VHOST_SET_OWNER ioctl. This calls vhost_task_create() to
> create the task_struct which runs the vhost_worker() function which handles
> the work->fns.
> 3. If userspace now does a SIGKILL or just exits without doing a close() o...
2023 Jun 06
1
[CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression
....
>>
>> - Is it the task_struct's context that we did the
>> kernel/vhost_taskc.c:vhost_task_create() from? Below it would be the
>> thread we did VHOST_SET_OWNER from.
>
> Yes,
>
>> So it works like if we were using a kthread still:
>>
>> 1. Userapce thread0 opens /dev/vhost-$something.
>> 2. thread0 does VHOST_SET_OWNER ioctl. This calls vhost_task_create() to
>> create the task_struct which runs the vhost_worker() function which handles
>> the work->fns.
>> 3. If userspace now does a SIGKILL or just exits without d...