On Tue, Dec 01, 2020 at 08:20:50PM +0100, Peter Zijlstra wrote:
> On Tue, Dec 01, 2020 at 02:11:33PM -0500, Joel Fernandes wrote:
> > On Wed, Nov 25, 2020 at 12:15:41PM +0100, Peter Zijlstra wrote:
> > > On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > >
> > > > +/*
>
Hi Peter,
On Tue, Dec 01, 2020 at 08:34:51PM +0100, Peter Zijlstra wrote:
> On Tue, Dec 01, 2020 at 02:20:28PM -0500, Joel Fernandes wrote:
> > On Wed, Nov 25, 2020 at 12:10:14PM +0100, Peter Zijlstra wrote:
> > > On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > > >
On Tue, Dec 1, 2020 at 11:55 PM Peter Zijlstra wrote:
>
> Then disallow sharing a task cookie when the tasks are in different
> cgroups or disallow cgroup movement when they share a cookie.
Yes, we could restrict task cookie sharing to tasks that are in the
same cgroup. Then the cookie easily
On Tue, Dec 01, 2020 at 10:36:18PM -0800, Josh Don wrote:
> On Tue, Dec 1, 2020 at 11:35 AM Peter Zijlstra wrote:
> >
> > So I don't think that later patch is right... That is, it works, but
> > afaict it's massive overkill.
> >
> > COOKIE_CMP_RETURN(task_cookie);
> >
On Tue, Dec 1, 2020 at 11:35 AM Peter Zijlstra wrote:
>
> So I don't think that later patch is right... That is, it works, but
> afaict it's massive overkill.
>
> COOKIE_CMP_RETURN(task_cookie);
> COOKIE_CMP_RETURN(group_cookie);
> COOKIE_CMP_RETURN(color);
>
> So if
On Tue, Dec 01, 2020 at 02:20:28PM -0500, Joel Fernandes wrote:
> On Wed, Nov 25, 2020 at 12:10:14PM +0100, Peter Zijlstra wrote:
> > On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > > +void sched_core_tag_requeue(struct task_struct *p, unsigned long cookie,
> > > bool
On Tue, Dec 01, 2020 at 02:11:33PM -0500, Joel Fernandes wrote:
> On Wed, Nov 25, 2020 at 12:15:41PM +0100, Peter Zijlstra wrote:
> > On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> >
> > > +/*
> > > + * Ensure that the task has been requeued. The stopper ensures that
On Wed, Nov 25, 2020 at 12:10:14PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > +void sched_core_tag_requeue(struct task_struct *p, unsigned long cookie,
> > bool group)
> > +{
> > + if (!p)
> > + return;
> > +
> > + if
On Wed, Nov 25, 2020 at 12:11:28PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
>
> > + * sched_core_tag_requeue - Common helper for all interfaces to set a
> > cookie.
>
> sched_core_set_cookie() would be a saner name, given that
On Wed, Nov 25, 2020 at 12:15:41PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
>
> > +/*
> > + * Ensure that the task has been requeued. The stopper ensures that the
> > task cannot
> > + * be migrated to a different CPU while its core
On Wed, Nov 25, 2020 at 12:07:09PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > Also, for the per-task cookie, it will get weird if we use pointers of any
> > emphemeral objects. For this reason, introduce a refcounted object who's
>
On Wed, Nov 25, 2020 at 02:03:22PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > +static bool sched_core_get_task_cookie(unsigned long cookie)
> > +{
> > + struct sched_core_cookie *ptr = (struct sched_core_cookie *)cookie;
> > +
> >
On Wed, Nov 25, 2020 at 01:54:47PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> > +/* Per-task interface */
> > +static unsigned long sched_core_alloc_task_cookie(void)
> > +{
> > + struct sched_core_cookie *ptr =
> > +
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> In order to prevent interference and clearly support both per-task and CGroup
> APIs, split the cookie into 2 and allow it to be set from either per-task, or
> CGroup API. The final cookie is the combined value of both and
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> +static bool sched_core_get_task_cookie(unsigned long cookie)
> +{
> + struct sched_core_cookie *ptr = (struct sched_core_cookie *)cookie;
> +
> + /*
> + * NOTE: sched_core_put() is not done by
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> +/* Per-task interface */
> +static unsigned long sched_core_alloc_task_cookie(void)
> +{
> + struct sched_core_cookie *ptr =
> + kmalloc(sizeof(struct sched_core_cookie), GFP_KERNEL);
> +
> + if (!ptr)
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> +/*
> + * Ensure that the task has been requeued. The stopper ensures that the task
> cannot
> + * be migrated to a different CPU while its core scheduler queue state is
> being updated.
> + * It also makes sure to
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> + * sched_core_tag_requeue - Common helper for all interfaces to set a cookie.
sched_core_set_cookie() would be a saner name, given that description,
don't you think?
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> +void sched_core_tag_requeue(struct task_struct *p, unsigned long cookie,
> bool group)
> +{
> + if (!p)
> + return;
> +
> + if (group)
> + p->core_group_cookie = cookie;
> + else
> +
On Tue, Nov 17, 2020 at 06:19:52PM -0500, Joel Fernandes (Google) wrote:
> Also, for the per-task cookie, it will get weird if we use pointers of any
> emphemeral objects. For this reason, introduce a refcounted object who's sole
> purpose is to assign unique cookie value by way of the object's
In order to prevent interference and clearly support both per-task and CGroup
APIs, split the cookie into 2 and allow it to be set from either per-task, or
CGroup API. The final cookie is the combined value of both and is computed when
the stop-machine executes during a change of cookie.
Also,
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