drivers/cpuidle/governors/haltpoll.c | 3 +++ include/trace/events/power.h | 29 ++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+)
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
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>
On Mon, May 30, 2022 at 7:37 PM Marcelo Tosatti <mtosatti@redhat.com> wrote: > > 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> I took this as an ACK and applied the patch as 5.20 material. Thanks!
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