On Wed, Sep 2, 2015 at 12:42 AM, Wanpeng Li <wanpeng.li@xxxxxxxxxxx> wrote:
> Tracepoint for dynamic halt_pool_ns, fired on every potential change.
>
> Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxx>
> ---
> 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/
> + __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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