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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>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
#ifndef __PERF_TOOL_H
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#define __PERF_TOOL_H
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#include <stdbool.h>
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struct perf_session;
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union perf_event;
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struct perf_evlist;
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struct perf_evsel;
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struct perf_sample;
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struct perf_tool;
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struct machine;
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typedef int (*event_sample)(struct perf_tool *tool, union perf_event *event,
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struct perf_sample *sample,
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struct perf_evsel *evsel, struct machine *machine);
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typedef int (*event_op)(struct perf_tool *tool, union perf_event *event,
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struct perf_sample *sample, struct machine *machine);
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typedef int (*event_attr_op)(union perf_event *event,
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struct perf_evlist **pevlist);
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typedef int (*event_simple_op)(struct perf_tool *tool, union perf_event *event);
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typedef int (*event_synth_op)(union perf_event *event,
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struct perf_session *session);
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typedef int (*event_op2)(struct perf_tool *tool, union perf_event *event,
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struct perf_session *session);
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struct perf_tool {
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event_sample sample,
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read;
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event_op mmap,
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comm,
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fork,
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exit,
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lost,
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throttle,
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unthrottle;
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event_attr_op attr;
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event_synth_op tracing_data;
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event_simple_op event_type;
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event_op2 finished_round,
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build_id;
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bool ordered_samples;
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bool ordering_requires_timestamps;
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};
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#endif /* __PERF_TOOL_H */
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