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authorArnaldo Carvalho de Melo <acme@redhat.com>2011-11-28 23:57:40 +0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-11-28 23:57:40 +0400
commitee29be625bd7b115d45eba4b0526ff3e24bf3ca0 (patch)
tree1ef1189e0fe02511642e5f74f463d888dfa34bec /tools/perf/util/tool.h
parente7984b7bee2fca8f582f5bc2bf1e6c93420a5dd5 (diff)
downloadlinux-ee29be625bd7b115d45eba4b0526ff3e24bf3ca0.tar.xz
perf tools: Save some loops using perf_evlist__id2evsel
Since we already ask for PERF_SAMPLE_ID and use it to quickly find the associated evsel, add handler func + data to struct perf_evsel to avoid using chains of if(strcmp(event_name)) and also to avoid all the linear list searches via trace_event_find. To demonstrate the technique convert 'perf sched' to it: # perf sched record sleep 5m And then: Performance counter stats for '/tmp/oldperf sched lat': 646.929438 task-clock # 0.999 CPUs utilized 9 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 20,901 page-faults # 0.032 M/sec 1,290,144,450 cycles # 1.994 GHz <not supported> stalled-cycles-frontend <not supported> stalled-cycles-backend 1,606,158,439 instructions # 1.24 insns per cycle 339,088,395 branches # 524.151 M/sec 4,550,735 branch-misses # 1.34% of all branches 0.647524759 seconds time elapsed Versus: Performance counter stats for 'perf sched lat': 473.564691 task-clock # 0.999 CPUs utilized 9 context-switches # 0.000 M/sec 0 CPU-migrations # 0.000 M/sec 20,903 page-faults # 0.044 M/sec 944,367,984 cycles # 1.994 GHz <not supported> stalled-cycles-frontend <not supported> stalled-cycles-backend 1,442,385,571 instructions # 1.53 insns per cycle 308,383,106 branches # 651.195 M/sec 4,481,784 branch-misses # 1.45% of all branches 0.474215751 seconds time elapsed [root@emilia ~]# Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-1kbzpl74lwi6lavpqke2u2p3@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/tool.h')
-rw-r--r--tools/perf/util/tool.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 89ff1b551a74..b0e1aadba8d5 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -1,8 +1,13 @@
#ifndef __PERF_TOOL_H
#define __PERF_TOOL_H
+#include <stdbool.h>
+
struct perf_session;
+union perf_event;
+struct perf_evlist;
struct perf_evsel;
+struct perf_sample;
struct perf_tool;
struct machine;