On Thu, Dec 20, 2018 at 05:16:50PM +0100, Oleg Nesterov wrote:
> On 12/18, Roman Gushchin wrote:
> >
> > > > > > --- a/kernel/freezer.c
> > > > > > +++ b/kernel/freezer.c
> > > > > > @@ -134,7 +134,7 @@ bool freeze_task(struct task_struct *p)
> > > > > > return false;
> > > > > >
>
On 12/18, Roman Gushchin wrote:
>
> > > > > --- a/kernel/freezer.c
> > > > > +++ b/kernel/freezer.c
> > > > > @@ -134,7 +134,7 @@ bool freeze_task(struct task_struct *p)
> > > > > return false;
> > > > >
> > > > > spin_lock_irqsave(&freezer_lock, flags);
> > > > > - if
On Tue, Dec 18, 2018 at 06:12:30PM +0100, Oleg Nesterov wrote:
> On 12/18, Roman Gushchin wrote:
> >
> > On Wed, Dec 12, 2018 at 06:49:02PM +0100, Oleg Nesterov wrote:
> > > > > and btw what about suspend? try_to_freeze_tasks() will obviously
> > > > > fail
> > > > > if there is a ->frozen thr
On 12/18, Roman Gushchin wrote:
>
> On Wed, Dec 12, 2018 at 06:49:02PM +0100, Oleg Nesterov wrote:
> > > > and btw what about suspend? try_to_freeze_tasks() will obviously
> > > > fail
> > > > if there is a ->frozen thread?
> > >
> > > I have to think a bit more here, but something like this w
On Wed, Dec 12, 2018 at 06:49:02PM +0100, Oleg Nesterov wrote:
> On 12/11, Roman Gushchin wrote:
> >
> > On Tue, Dec 11, 2018 at 05:26:32PM +0100, Oleg Nesterov wrote:
> > > On 12/07, Roman Gushchin wrote:
> > > >
> > > > Cgroup v2 freezer tries to put tasks into a state similar to jobctl
> > > > s
On 12/11, Roman Gushchin wrote:
>
> On Tue, Dec 11, 2018 at 05:26:32PM +0100, Oleg Nesterov wrote:
> > On 12/07, Roman Gushchin wrote:
> > >
> > > Cgroup v2 freezer tries to put tasks into a state similar to jobctl
> > > stop. This means that tasks can be killed, ptraced (using
> > > PTRACE_SEIZE*)
On Tue, Dec 11, 2018 at 05:26:32PM +0100, Oleg Nesterov wrote:
> On 12/07, Roman Gushchin wrote:
> >
> > Cgroup v2 freezer tries to put tasks into a state similar to jobctl
> > stop. This means that tasks can be killed, ptraced (using
> > PTRACE_SEIZE*), and interrupted. It is possible to attach to
On 12/07, Roman Gushchin wrote:
>
> Cgroup v2 freezer tries to put tasks into a state similar to jobctl
> stop. This means that tasks can be killed, ptraced (using
> PTRACE_SEIZE*), and interrupted. It is possible to attach to
> a frozen task, get some information (e.g. read registers) and detach.
Cgroup v1 implements the freezer controller, which provides an ability
to stop the workload in a cgroup and temporarily free up some
resources (cpu, io, network bandwidth and, potentially, memory)
for some other tasks. Cgroup v2 lacks this functionality.
This patch implements freezer for cgroup v2
