linux-kernel - Re: [PATCH v6 3/3] KVM: trace kvm_halt_poll

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Date:	Thu, 3 Sep 2015 07:17:44 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	David Matlack <dmatlack@...gle.com>
CC:	Paolo Bonzini <pbonzini@...hat.com>,
	kvm list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 3/3] KVM: trace kvm_halt_poll_ns grow/shrink

On 9/3/15 2:09 AM, David Matlack wrote:
> On Wed, Sep 2, 2015 at 12:42 AM, Wanpeng Li <wanpeng.li@...mail.com> wrote:
>> Tracepoint for dynamic halt_pool_ns, fired on every potential change.
>>
>> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
>> ---
>>   include/trace/events/kvm.h | 30 ++++++++++++++++++++++++++++++
>>   virt/kvm/kvm_main.c        |  8 ++++++--
>>   2 files changed, 36 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
>> index a44062d..75ddf80 100644
>> --- a/include/trace/events/kvm.h
>> +++ b/include/trace/events/kvm.h
>> @@ -356,6 +356,36 @@ TRACE_EVENT(
>>                    __entry->address)
>>   );
>>
>> +TRACE_EVENT(kvm_halt_poll_ns,
>> +       TP_PROTO(bool grow, unsigned int vcpu_id, int new, int old),
>> +       TP_ARGS(grow, vcpu_id, new, old),
>> +
>> +       TP_STRUCT__entry(
>> +               __field(bool, grow)
>> +               __field(unsigned int, vcpu_id)
>> +               __field(int, new)
>> +               __field(int, old)
>> +       ),
>> +
>> +       TP_fast_assign(
>> +               __entry->grow           = grow;
>> +               __entry->vcpu_id        = vcpu_id;
>> +               __entry->new            = new;
>> +               __entry->old            = old;
>> +       ),
>> +
>> +       TP_printk("vcpu %u: halt_pool_ns %d (%s %d)",
> s/pool/poll/

Will fix it in next version, thx David! ;-)

Regards,
Wanpeng Li

>
>> +                       __entry->vcpu_id,
>> +                       __entry->new,
>> +                       __entry->grow ? "grow" : "shrink",
>> +                       __entry->old)
>> +);
>> +
>> +#define trace_kvm_halt_poll_ns_grow(vcpu_id, new, old) \
>> +       trace_kvm_halt_poll_ns(true, vcpu_id, new, old)
>> +#define trace_kvm_halt_poll_ns_shrink(vcpu_id, new, old) \
>> +       trace_kvm_halt_poll_ns(false, vcpu_id, new, old)
>> +
>>   #endif
>>
>>   #endif /* _TRACE_KVM_MAIN_H */
>> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
>> index 3cff02f..fee339e 100644
>> --- a/virt/kvm/kvm_main.c
>> +++ b/virt/kvm/kvm_main.c
>> @@ -1918,8 +1918,9 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
>>
>>   static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
>>   {
>> -       int val = vcpu->halt_poll_ns;
>> +       int old, val;
>>
>> +       old = val = vcpu->halt_poll_ns;
>>          /* 10us base */
>>          if (val == 0 && halt_poll_ns_grow)
>>                  val = 10000;
>> @@ -1927,18 +1928,21 @@ static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
>>                  val *= halt_poll_ns_grow;
>>
>>          vcpu->halt_poll_ns = val;
>> +       trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
>>   }
>>
>>   static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
>>   {
>> -       int val = vcpu->halt_poll_ns;
>> +       int old, val;
>>
>> +       old = val = vcpu->halt_poll_ns;
>>          if (halt_poll_ns_shrink == 0)
>>                  val = 0;
>>          else
>>                  val /= halt_poll_ns_shrink;
>>
>>          vcpu->halt_poll_ns = val;
>> +       trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
>>   }
>>
>>   static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
>> --
>> 1.9.1
>>

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