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| author | Wanpeng Li <wanpeng.li@hotmail.com> | 2015-09-03 22:07:39 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-09-06 16:33:14 +0200 |
| commit | 2cbd78244fb26a06f2b8fb006b32f133451df413 (patch) | |
| tree | 1fac5e7a0438045dc3036fe27ab9f177628823cb /virt/kvm | |
| parent | aca6ff29c4063a8d467cdee241e6b3bf7dc4a171 (diff) | |
| download | linux-2cbd78244fb26a06f2b8fb006b32f133451df413.tar.bz2 | |
KVM: trace kvm_halt_poll_ns grow/shrink
Tracepoint for dynamic halt_pool_ns, fired on every potential change.
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/kvm_main.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 8ab49cfc024e..4662a8877f6c 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) |