Path: csiph.com!au2pb.net!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.CARNet.hr!news.spin.it!bofh.it!news.nic.it!robomod From: Wanpeng Li Newsgroups: linux.kernel Subject: [PATCH v4 3/3] KVM: trace kvm_halt_poll_ns grow/shrink Date: Thu, 27 Aug 2015 12:00:03 +0200 Message-ID: References: X-Original-To: Paolo Bonzini X-Tmn: [uEgyQ6sqEW1MLjAQe6RvjnEpfRmBPNLIFq2QsQZhuNQ=] X-Originating-Email: [wanpeng.li@hotmail.com] X-Mailer: git-send-email 1.9.1 X-Originalarrivaltime: 27 Aug 2015 09:52:40.0137 (UTC) FILETIME=[1C884B90:01D0E0AE] MIME-Version: 1.0 Content-Type: text/plain Sender: robomod@news.nic.it List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Approved: robomod@news.nic.it Lines: 95 Organization: linux.* mail to news gateway X-Original-Cc: David Matlack , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Wanpeng Li X-Original-Date: Thu, 27 Aug 2015 17:52:19 +0800 X-Original-Message-ID: X-Original-References: <1440669139-2313-1-git-send-email-wanpeng.li@hotmail.com> X-Original-Sender: linux-kernel-owner@vger.kernel.org Xref: csiph.com linux.kernel:1214442 Tracepoint for dynamic halt_pool_ns, fired on every potential change. Signed-off-by: Wanpeng Li --- 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)", + __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 d63790d..a3aa23f0 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; /* 500us step */ if (val == 0 && halt_poll_ns_grow) val = 500000; @@ -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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/