Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754256Ab3HBUGM (ORCPT ); Fri, 2 Aug 2013 16:06:12 -0400 Received: from mail-pb0-f54.google.com ([209.85.160.54]:63964 "EHLO mail-pb0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753783Ab3HBUGI (ORCPT ); Fri, 2 Aug 2013 16:06:08 -0400 From: David Ahern To: acme@ghostprotocols.net, linux-kernel@vger.kernel.org Cc: David Ahern , Ingo Molnar , Frederic Weisbecker , Peter Zijlstra , Jiri Olsa , Namhyung Kim , Xiao Guangrong , Runzhen Wang Subject: [PATCH 7/9] perf kvm: option to print events that exceed a threshold Date: Fri, 2 Aug 2013 14:05:45 -0600 Message-Id: <1375473947-64285-8-git-send-email-dsahern@gmail.com> X-Mailer: git-send-email 1.7.10.1 In-Reply-To: <1375473947-64285-1-git-send-email-dsahern@gmail.com> References: <1375473947-64285-1-git-send-email-dsahern@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3594 Lines: 113 This is useful to spot high latency blips. Signed-off-by: David Ahern Cc: Arnaldo Carvalho de Melo Cc: Ingo Molnar Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Jiri Olsa Cc: Namhyung Kim Cc: Xiao Guangrong Cc: Runzhen Wang --- tools/perf/builtin-kvm.c | 25 +++++++++++++++++++++---- tools/perf/perf.h | 3 +++ 2 files changed, 24 insertions(+), 4 deletions(-) diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index 5c6e3cd..28afc05d 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -106,6 +106,7 @@ struct perf_kvm_stat { u64 total_time; u64 total_count; u64 lost_events; + u64 threshold; struct rb_root result; @@ -470,7 +471,7 @@ static bool update_kvm_event(struct kvm_event *event, int vcpu_id, static bool handle_end_event(struct perf_kvm_stat *kvm, struct vcpu_event_record *vcpu_record, struct event_key *key, - u64 timestamp) + struct perf_sample *sample) { struct kvm_event *event; u64 time_begin, time_diff; @@ -507,12 +508,24 @@ static bool handle_end_event(struct perf_kvm_stat *kvm, vcpu_record->start_time = 0; /* seems to happen once in a while during live mode */ - if (timestamp < time_begin) { + if (sample->time < time_begin) { pr_debug("End time before begin time; skipping event.\n"); return true; } - time_diff = timestamp - time_begin; + time_diff = sample->time - time_begin; + + if (kvm->threshold && time_diff > kvm->threshold) { + char decode[32]; + + kvm->events_ops->decode_key(kvm, &event->key, decode); + if (strcmp(decode, "HLT")) { + pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n", + sample->time, sample->pid, vcpu_record->vcpu_id, + decode, time_diff/1000); + } + } + return update_kvm_event(event, vcpu, time_diff); } @@ -559,7 +572,7 @@ static bool handle_kvm_event(struct perf_kvm_stat *kvm, return handle_begin_event(kvm, vcpu_record, &key, sample->time); if (kvm->events_ops->is_end_event(evsel, sample, &key)) - return handle_end_event(kvm, vcpu_record, &key, sample->time); + return handle_end_event(kvm, vcpu_record, &key, sample); return true; } @@ -1382,6 +1395,8 @@ static int kvm_events_live(struct perf_kvm_stat *kvm, OPT_STRING('k', "key", &kvm->sort_key, "sort-key", "key for sorting: sample(sort by samples number)" " time (sort by avg time)"), + OPT_U64('T', "threshold", &kvm->threshold, + "show events that take longer than threshold usecs"), OPT_END() }; const char * const live_usage[] = { @@ -1420,6 +1435,8 @@ static int kvm_events_live(struct perf_kvm_stat *kvm, usage_with_options(live_usage, live_options); } + kvm->threshold *= NSEC_PER_USEC; /* convert usec to nsec */ + /* * target related setups */ diff --git a/tools/perf/perf.h b/tools/perf/perf.h index 32bd102..cf20187 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -125,6 +125,9 @@ #ifndef NSEC_PER_SEC # define NSEC_PER_SEC 1000000000ULL #endif +#ifndef NSEC_PER_USEC +# define NSEC_PER_USEC 1000ULL +#endif static inline unsigned long long rdclock(void) { -- 1.7.10.1 -- 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/