| Message ID | 20220527005345.189906-1-eiichi.tsukata@nutanix.com |
|---|---|
| State | Accepted |
| Commit | 0da11bf0cab9029db8b85e48d962ff05c00a4faa |
| Headers | show |
| Series | [v4] cpuidle: haltpoll: Add trace points for guest_halt_poll_ns grow/shrink | expand |
On Fri, May 27, 2022 at 12:53:45AM +0000, Eiichi Tsukata wrote: > Add trace points as are implemented in KVM host halt polling. > This helps tune guest halt polling params. > > Signed-off-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com> > --- > drivers/cpuidle/governors/haltpoll.c | 3 +++ > include/trace/events/power.h | 29 ++++++++++++++++++++++++++++ > 2 files changed, 32 insertions(+) > > diff --git a/drivers/cpuidle/governors/haltpoll.c b/drivers/cpuidle/governors/haltpoll.c > index cb2a96eafc02..1dff3a52917d 100644 > --- a/drivers/cpuidle/governors/haltpoll.c > +++ b/drivers/cpuidle/governors/haltpoll.c > @@ -19,6 +19,7 @@ > #include <linux/sched.h> > #include <linux/module.h> > #include <linux/kvm_para.h> > +#include <trace/events/power.h> > > static unsigned int guest_halt_poll_ns __read_mostly = 200000; > module_param(guest_halt_poll_ns, uint, 0644); > @@ -90,6 +91,7 @@ static void adjust_poll_limit(struct cpuidle_device *dev, u64 block_ns) > if (val > guest_halt_poll_ns) > val = guest_halt_poll_ns; > > + trace_guest_halt_poll_ns_grow(val, dev->poll_limit_ns); > dev->poll_limit_ns = val; > } else if (block_ns > guest_halt_poll_ns && > guest_halt_poll_allow_shrink) { > @@ -100,6 +102,7 @@ static void adjust_poll_limit(struct cpuidle_device *dev, u64 block_ns) > val = 0; > else > val /= shrink; > + trace_guest_halt_poll_ns_shrink(val, dev->poll_limit_ns); > dev->poll_limit_ns = val; > } > } > diff --git a/include/trace/events/power.h b/include/trace/events/power.h > index af5018aa9517..c708521e4ed5 100644 > --- a/include/trace/events/power.h > +++ b/include/trace/events/power.h > @@ -500,6 +500,35 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request, > > TP_ARGS(name, type, new_value) > ); > + > +TRACE_EVENT(guest_halt_poll_ns, > + > + TP_PROTO(bool grow, unsigned int new, unsigned int old), > + > + TP_ARGS(grow, new, old), > + > + TP_STRUCT__entry( > + __field(bool, grow) > + __field(unsigned int, new) > + __field(unsigned int, old) > + ), > + > + TP_fast_assign( > + __entry->grow = grow; > + __entry->new = new; > + __entry->old = old; > + ), > + > + TP_printk("halt_poll_ns %u (%s %u)", > + __entry->new, > + __entry->grow ? "grow" : "shrink", > + __entry->old) > +); > + > +#define trace_guest_halt_poll_ns_grow(new, old) \ > + trace_guest_halt_poll_ns(true, new, old) > +#define trace_guest_halt_poll_ns_shrink(new, old) \ > + trace_guest_halt_poll_ns(false, new, old) > #endif /* _TRACE_POWER_H */ > > /* This part must be outside protection */ > -- > 2.36.1 > > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/drivers/cpuidle/governors/haltpoll.c b/drivers/cpuidle/governors/haltpoll.c index cb2a96eafc02..1dff3a52917d 100644 --- a/drivers/cpuidle/governors/haltpoll.c +++ b/drivers/cpuidle/governors/haltpoll.c @@ -19,6 +19,7 @@ #include <linux/sched.h> #include <linux/module.h> #include <linux/kvm_para.h> +#include <trace/events/power.h> static unsigned int guest_halt_poll_ns __read_mostly = 200000; module_param(guest_halt_poll_ns, uint, 0644); @@ -90,6 +91,7 @@ static void adjust_poll_limit(struct cpuidle_device *dev, u64 block_ns) if (val > guest_halt_poll_ns) val = guest_halt_poll_ns; + trace_guest_halt_poll_ns_grow(val, dev->poll_limit_ns); dev->poll_limit_ns = val; } else if (block_ns > guest_halt_poll_ns && guest_halt_poll_allow_shrink) { @@ -100,6 +102,7 @@ static void adjust_poll_limit(struct cpuidle_device *dev, u64 block_ns) val = 0; else val /= shrink; + trace_guest_halt_poll_ns_shrink(val, dev->poll_limit_ns); dev->poll_limit_ns = val; } } diff --git a/include/trace/events/power.h b/include/trace/events/power.h index af5018aa9517..c708521e4ed5 100644 --- a/include/trace/events/power.h +++ b/include/trace/events/power.h @@ -500,6 +500,35 @@ DEFINE_EVENT(dev_pm_qos_request, dev_pm_qos_remove_request, TP_ARGS(name, type, new_value) ); + +TRACE_EVENT(guest_halt_poll_ns, + + TP_PROTO(bool grow, unsigned int new, unsigned int old), + + TP_ARGS(grow, new, old), + + TP_STRUCT__entry( + __field(bool, grow) + __field(unsigned int, new) + __field(unsigned int, old) + ), + + TP_fast_assign( + __entry->grow = grow; + __entry->new = new; + __entry->old = old; + ), + + TP_printk("halt_poll_ns %u (%s %u)", + __entry->new, + __entry->grow ? "grow" : "shrink", + __entry->old) +); + +#define trace_guest_halt_poll_ns_grow(new, old) \ + trace_guest_halt_poll_ns(true, new, old) +#define trace_guest_halt_poll_ns_shrink(new, old) \ + trace_guest_halt_poll_ns(false, new, old) #endif /* _TRACE_POWER_H */ /* This part must be outside protection */
Add trace points as are implemented in KVM host halt polling. This helps tune guest halt polling params. Signed-off-by: Eiichi Tsukata <eiichi.tsukata@nutanix.com> --- drivers/cpuidle/governors/haltpoll.c | 3 +++ include/trace/events/power.h | 29 ++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+)