linux/tools/perf
Arnaldo Carvalho de Melo cb9dd49e11 perf tools: Fix synthesizing tracepoint names from the perf.data headers
We need to use the per event info snapshoted at record time to
synthesize the events name, so do it just after reading the perf.data
headers, when we already processed the /sys events data, otherwise we'll
end up using the local /sys that only by sheer luck will have the same
tracepoint ID -> real event association.

Example:

  # uname -a
  Linux felicio.ghostprotocols.net 3.4.0-rc5+ #1 SMP Sat May 19 15:27:11 BRT 2012 x86_64 x86_64 x86_64 GNU/Linux
  # perf record -e sched:sched_switch usleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.015 MB perf.data (~648 samples) ]
  # cat /t/events/sched/sched_switch/id
  279
  # perf evlist -v
  sched:sched_switch: sample_freq=1, type: 2, config: 279, size: 80, sample_type: 1159, read_format: 7, disabled: 1, inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1
  #

So on the above machine the sched:sched_switch has tracepoint id 279, but on
the machine were we'll analyse it it has a different id:

  $ cat /t/events/sched/sched_switch/id
  56
  $ perf evlist -i /tmp/perf.data
  kmem:mm_balancedirty_writeout
  $ cat /t/events/kmem/mm_balancedirty_writeout/id
  279

With this fix:

  $ perf evlist -i /tmp/perf.data
  sched:sched_switch

Reported-by: Dmitry Antipov <dmitry.antipov@linaro.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
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-auwks8fpuhmrdpiefs55o5oz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-06-12 11:28:09 -03:00
..
Documentation Merge branch 'linus' into perf/urgent 2012-05-30 10:59:04 +02:00
arch perf tools: Use scnprintf where applicable 2012-03-14 12:36:19 -03:00
bench perf tool: Fix perf stack to non executable on x86_64 2012-02-06 19:14:17 -02:00
config perf report: Add a simple GTK2-based 'perf report' browser 2012-03-19 15:13:29 -03:00
python perf python: Use attr.watermark in twatch.py 2012-01-30 18:38:23 -02:00
scripts perf script: Add drop monitor script 2011-09-29 16:41:37 -03:00
ui perf annotate browser: Fix help window entry for navigating to hottest line 2012-05-30 12:31:44 -03:00
util perf tools: Fix synthesizing tracepoint names from the perf.data headers 2012-06-12 11:28:09 -03:00
.gitignore perf tools: Ignore auto-generated bison/flex files 2012-04-14 13:50:39 -03:00
CREDITS perf_counter tools: Add CREDITS file for Git contributors 2009-06-24 19:54:29 +02:00
MANIFEST perf tools: Fix make tarballs 2012-05-30 15:05:59 -03:00
Makefile perf tools: Do not use _FORTIFY_SOURCE when DEBUG=1 is specified 2012-05-24 14:48:39 -03:00
builtin-annotate.c perf tools: Convert critical messages to ui__error() 2012-05-29 11:53:42 -03:00
builtin-bench.c perf bench: Also allow measuring memset() 2012-01-24 20:25:32 -02:00
builtin-buildid-cache.c perf buildid: add perfconfig option to specify buildid cache dir 2010-06-05 09:34:04 -03:00
builtin-buildid-list.c perf buildid-list: Work better with pipe mode 2012-05-22 13:03:54 -03:00
builtin-diff.c perf diff: Fix to work with new hists design 2012-03-22 15:12:09 -03:00
builtin-evlist.c perf evlist: Explicititely initialize input_name 2012-05-23 21:47:51 -03:00
builtin-help.c perf options: Type check all the remaining OPT_ variants 2010-05-17 16:22:41 -03:00
builtin-inject.c perf inject: Fix broken perf inject -b 2012-05-22 12:59:28 -03:00
builtin-kmem.c perf: Have perf use the new libtraceevent.a library 2012-04-25 13:28:48 +02:00
builtin-kvm.c perf kvm: Do guest-only counting by default 2012-01-06 15:47:37 -02:00
builtin-list.c perf list: Allow filtering list of events 2011-02-17 15:38:58 -02:00
builtin-lock.c perf: Have perf use the new libtraceevent.a library 2012-04-25 13:28:48 +02:00
builtin-probe.c perf probe: Detect probe target when m/x options are absent 2012-05-11 13:58:53 -03:00
builtin-record.c perf tools: Convert critical messages to ui__error() 2012-05-29 11:53:42 -03:00
builtin-report.c perf callchain: Make callchain cursors TLS 2012-05-31 10:47:12 -03:00
builtin-sched.c perf: Have perf use the new libtraceevent.a library 2012-04-25 13:28:48 +02:00
builtin-script.c perf: Have perf use the new libtraceevent.a library 2012-04-25 13:28:48 +02:00
builtin-stat.c perf stat: Fix default output file 2012-06-11 11:20:21 -03:00
builtin-test.c perf test: Move parse event automated tests to separated object 2012-05-22 11:19:16 -03:00
builtin-timechart.c perf report: Accept fifos as input file 2011-12-23 17:01:03 -02:00
builtin-top.c perf callchain: Make callchain cursors TLS 2012-05-31 10:47:12 -03:00
builtin.h perf tools: Make perf.data more self-descriptive (v8) 2011-10-07 17:01:24 -03:00
command-list.txt perf evlist: New command to list the names of events present in a perf.data file 2011-03-15 11:10:48 -03:00
design.txt perf tools: Update ioctl documentation for PERF_IOC_FLAG_GROUP 2012-05-31 11:38:42 -03:00
perf-archive.sh perf archive: Correct cutting of symbolic link 2012-04-14 13:52:15 -03:00
perf.c perf tools: Simplify debugfs mountpoint handling code 2011-11-28 10:11:28 -02:00
perf.h perf record: Fix branch_stack type in perf_record_opts 2012-05-25 18:32:44 -03:00