From 0da11bf0cab9029db8b85e48d962ff05c00a4faa Mon Sep 17 00:00:00 2001
From: Eiichi Tsukata <eiichi.tsukata@nutanix.com>
Date: Fri, 27 May 2022 00:53:45 +0000
Subject: cpuidle: haltpoll: Add trace points for guest_halt_poll_ns
 grow/shrink

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>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/cpuidle/governors/haltpoll.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/cpuidle')

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;
 	}
 }
-- 
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