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| author | Eiichi Tsukata <eiichi.tsukata@nutanix.com> | 2022-05-27 02:53:45 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-06-14 16:01:35 +0200 |
| commit | 0da11bf0cab9029db8b85e48d962ff05c00a4faa (patch) | |
| tree | 0edcbbfee8c88215fb27eddd9f4f24a7e03ddbd1 /drivers/cpuidle | |
| parent | Linux 5.19-rc2 (diff) | |
| download | linux-0da11bf0cab9029db8b85e48d962ff05c00a4faa.tar.xz linux-0da11bf0cab9029db8b85e48d962ff05c00a4faa.zip | |
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>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/governors/haltpoll.c | 3 |
1 files changed, 3 insertions, 0 deletions
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; } } |