On 5/23/2018 6:47 PM, Johannes Weiner wrote:
> On Wed, May 09, 2018 at 04:33:24PM +0530, Vinayak Menon wrote:
>> On 5/8/2018 2:31 AM, Johannes Weiner wrote:
>>> + /* Kick the stats aggregation worker if it's gone to sleep */
>>> + if (!delayed_work_pending(&group->clock_work))
>> This causes a
On Wed, May 09, 2018 at 04:33:24PM +0530, Vinayak Menon wrote:
> On 5/8/2018 2:31 AM, Johannes Weiner wrote:
> > + /* Kick the stats aggregation worker if it's gone to sleep */
> > + if (!delayed_work_pending(&group->clock_work))
>
> This causes a crash when the work is scheduled before system
On Thu, May 10, 2018 at 09:41:32AM -0400, Johannes Weiner wrote:
> So there is a reason I'm tracking productivity states per-cpu and not
> globally. Consider the following example periods on two CPUs:
>
> CPU 0
> Task 1: | EXECUTING | memstalled |
> Task 2: | runqueued | EXECUTING |
>
>
On Wed, May 09, 2018 at 12:21:00PM +0200, Peter Zijlstra wrote:
> On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> > + local_irq_disable();
> > + rq = this_rq();
> > + raw_spin_lock(&rq->lock);
> > + rq_pin_lock(rq, &rf);
>
> Given that churn in sched.h, you seen rq_lock(
On Wed, May 09, 2018 at 12:14:54PM +0200, Peter Zijlstra wrote:
> On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> > diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> > index 15750c222ca2..1658477466d5 100644
> > --- a/kernel/sched/sched.h
> > +++ b/kernel/sched/sched.h
[
On Wed, May 09, 2018 at 12:05:51PM +0200, Peter Zijlstra wrote:
> On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> > + u64 some[NR_PSI_RESOURCES] = { 0, };
> > + u64 full[NR_PSI_RESOURCES] = { 0, };
>
> > + some[r] /= max(nonidle_total, 1UL);
> > + full[r]
On Wed, May 09, 2018 at 12:04:55PM +0200, Peter Zijlstra wrote:
> On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> > +static void psi_clock(struct work_struct *work)
> > +{
> > + u64 some[NR_PSI_RESOURCES] = { 0, };
> > + u64 full[NR_PSI_RESOURCES] = { 0, };
> > + unsigned l
On Wed, May 09, 2018 at 11:59:38AM +0200, Peter Zijlstra wrote:
> On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> > diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
> > new file mode 100644
> > index ..b22b0ffc729d
> > --- /dev/null
> > +++ b/include
On Wed, May 09, 2018 at 01:38:49PM +0200, Peter Zijlstra wrote:
> On Wed, May 09, 2018 at 12:46:18PM +0200, Peter Zijlstra wrote:
> > On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> >
> > > @@ -2038,6 +2038,7 @@ try_to_wake_up(struct task_struct *p, unsigned int
> > > state, in
On Wed, May 09, 2018 at 12:46:18PM +0200, Peter Zijlstra wrote:
> On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
>
> > @@ -2038,6 +2038,7 @@ try_to_wake_up(struct task_struct *p, unsigned int
> > state, int wake_flags)
> > cpu = select_task_rq(p, p->wake_cpu, SD_BALANCE_WAKE
On 5/8/2018 2:31 AM, Johannes Weiner wrote:
> +static void psi_group_update(struct psi_group *group, int cpu, u64 now,
> + unsigned int clear, unsigned int set)
> +{
> + enum psi_state state = PSI_NONE;
> + struct psi_group_cpu *groupc;
> + unsigned int *tasks;
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> @@ -28,10 +28,14 @@ static inline int sched_info_on(void)
> return 1;
> #elif defined(CONFIG_TASK_DELAY_ACCT)
> extern int delayacct_on;
> - return delayacct_on;
> -#else
> - return 0;
> + if (delayacct_on)
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> @@ -2038,6 +2038,7 @@ try_to_wake_up(struct task_struct *p, unsigned int
> state, int wake_flags)
> cpu = select_task_rq(p, p->wake_cpu, SD_BALANCE_WAKE, wake_flags);
> if (task_cpu(p) != cpu) {
> wake_fl
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> +static void psi_clock(struct work_struct *work)
> +{
> + dwork = to_delayed_work(work);
> + group = container_of(dwork, struct psi_group, clock_work);
> +
> +
> + /* Keep the clock ticking only when there is action */
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> +/**
> + * psi_memstall_enter - mark the beginning of a memory stall section
> + * @flags: flags to handle nested sections
> + *
> + * Marks the calling task as being stalled due to a lack of memory,
> + * such as waiting for a refa
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index 15750c222ca2..1658477466d5 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -919,6 +921,8 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues)
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> + u64 some[NR_PSI_RESOURCES] = { 0, };
> + u64 full[NR_PSI_RESOURCES] = { 0, };
> + some[r] /= max(nonidle_total, 1UL);
> + full[r] /= max(nonidle_total, 1UL);
That's a bare 64bit divide.. that typi
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> +static void psi_clock(struct work_struct *work)
> +{
> + u64 some[NR_PSI_RESOURCES] = { 0, };
> + u64 full[NR_PSI_RESOURCES] = { 0, };
> + unsigned long nonidle_total = 0;
> + unsigned long missed_periods;
> + s
On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
> new file mode 100644
> index ..b22b0ffc729d
> --- /dev/null
> +++ b/include/linux/psi_types.h
> @@ -0,0 +1,84 @@
> +#ifndef _LINUX_PSI_TYPES_H
> +#defi
On Mon, May 07, 2018 at 05:42:36PM -0700, Randy Dunlap wrote:
> On 05/07/2018 02:01 PM, Johannes Weiner wrote:
> > + * The ratio is tracked in decaying time averages over 10s, 1m, 5m
> > + * windows. Cumluative stall times are tracked and exported as well to
>
>Cumulative
>
> > +
On Tue, May 08, 2018 at 11:04:09AM +0800, kbuild test robot wrote:
>118#else /* CONFIG_PSI */
>119static inline void psi_enqueue(struct task_struct *p, u64 now)
>120{
>121}
>122static inline void psi_dequeue(struct task_struct *p, u64 now)
Hi Johannes,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc4]
[cannot apply to next-20180507]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com/0
Hi Johannes,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc4]
[cannot apply to next-20180507]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
https://github.com/0
On 05/07/2018 02:01 PM, Johannes Weiner wrote:
>
> Signed-off-by: Johannes Weiner
> ---
> Documentation/accounting/psi.txt | 73 ++
> include/linux/psi.h | 27 ++
> include/linux/psi_types.h| 84 ++
> include/linux/sched.h| 10 +
> include/linux/sched
When systems are overcommitted and resources become contended, it's
hard to tell exactly the impact this has on workload productivity, or
how close the system is to lockups and OOM kills. In particular, when
machines work multiple jobs concurrently, the impact of overcommit in
terms of latency and
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