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  1. 22 5月, 2012 1 次提交
  3. 19 5月, 2012 1 次提交
    • D
      perf evsel: Create events initially disabled -- again · 5e1c81d9
      由 David Ahern 提交于 
      764e16a3 changed perf-record to create events disabled by default and
enable them once perf initializations are done. This setting was dropped
by 0f82ebc4. Now perf events are once again generated during perf's
initialization phase (e.g., generating maps).

As an example, perf opens a lot of files at startup. Unpatched:

perf record -e syscalls:sys_enter_open -ga -fo /tmp/perf.data -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.087 MB /tmp/perf.data (~3798 samples) ]

Using perf-script to look at the samples shows the perf command generating
563 of the 566 total events.

Patched:

perf record -e syscalls:sys_enter_open -ga -fo /tmp/perf.data -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.028 MB /tmp/perf.data (~1206 samples) ]

Using perf-script to look at the samples does not show perf command.
Signed-off-by: NDavid Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/1336968088-11531-1-git-send-email-dsahern@gmail.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      5e1c81d9
  5. 16 5月, 2012 1 次提交
  7. 08 5月, 2012 1 次提交
  9. 03 5月, 2012 2 次提交
  11. 27 3月, 2012 1 次提交
    • S
      perf tools: Fix bug in raw sample parsing · fa30c964
      由 Stephane Eranian 提交于 
      In perf_event__parse_sample(), the array variable was not incremented
by the amount of data used by the raw_data.

That was okay until we added PERF_SAMPLE_BRANCH_STACK which depends on
the array variable pointing to the beginning of the branch stack data.

But that was not the case if branch stack was combined with raw mode
sampling. That led to bogus branch stack addresses and count.

The bug would show up with:
$ perf record -R -b foo

This patch fixes the problem by correctly moving the array pointer
forward for RAW samples.
Signed-off-by: NStephane Eranian <eranian@google.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120317222317.GA8803@quad
[ committer note: Fix also later submitted by Jiri Olsa ]
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      fa30c964
  13. 23 3月, 2012 1 次提交
  15. 17 3月, 2012 1 次提交
  17. 09 3月, 2012 2 次提交
  19. 15 2月, 2012 1 次提交
  21. 14 2月, 2012 1 次提交
  23. 07 2月, 2012 1 次提交
    • N
      perf evsel: Fix an issue where perf report fails to show the proper percentage · a4a03fc7
      由 Naveen N. Rao 提交于 
      This patch fixes an issue where perf report shows nan% for certain
perf.data files. The below is from a report for a do_fork probe:

   -nan%           sshd  [kernel.kallsyms]  [k] do_fork
   -nan%    packagekitd  [kernel.kallsyms]  [k] do_fork
   -nan%    dbus-daemon  [kernel.kallsyms]  [k] do_fork
   -nan%           bash  [kernel.kallsyms]  [k] do_fork

A git bisect shows commit f3bda2c9 as the cause. However, looking back
through the git history, I saw commit 640c03ce which seems to have
removed the required initialization for perf_sample->period. The problem
only started showing after commit f3bda2c9. The below patch re-introduces
the initialization and it fixes the problem for me.

With the below patch, for the same perf.data:

  73.08%             bash  [kernel.kallsyms]  [k] do_fork
   8.97%      11-dhclient  [kernel.kallsyms]  [k] do_fork
   6.41%             sshd  [kernel.kallsyms]  [k] do_fork
   3.85%        20-chrony  [kernel.kallsyms]  [k] do_fork
   2.56%         sendmail  [kernel.kallsyms]  [k] do_fork

This patch applies over current linux-tip commit 9949284.

Problem introduced in:

$ git describe 640c03ce
v2.6.37-rc3-83-g640c03ce

Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/20120203170113.5190.25558.stgit@localhost6.localdomain6Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      a4a03fc7
  25. 31 1月, 2012 1 次提交
  27. 20 12月, 2011 2 次提交
  29. 12 12月, 2011 1 次提交
  31. 28 11月, 2011 1 次提交
  33. 16 11月, 2011 1 次提交
    • A
      perf python: Fix undefined symbol problem · 0e2a5f10
      由 Arnaldo Carvalho de Melo 提交于 
      Recently we made perf_evsel__init call hists__init, which broke the perf
python binding:

[root@emilia linux]# ./tools/perf/python/twatch.py
Traceback (most recent call last):
  File "./tools/perf/python/twatch.py", line 16, in <module>
    import perf
ImportError: /home/acme/git/build/perf/python/perf.so: undefined symbol: hists__init

Fix it by moving the hists__init function to its only caller, evsel.c.

This way we avoid dragging in other parts of tools/perf/util/ to the
perf python binding.

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-5nffmdt5mu6ozxgj54oi4qon@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      0e2a5f10
  35. 26 10月, 2011 1 次提交
  37. 07 10月, 2011 1 次提交
    • A
      perf hists: Threaded addition and sorting of entries · 1980c2eb
      由 Arnaldo Carvalho de Melo 提交于 
      By using a mutex just for inserting and rotating two hist_entry rb
trees, so that when sorting we can get the last batch of entries created
from the ring buffer, merge it with whatever we have processed so far
and show the output while new entries are being added.

The 'report' tool continues, for now, to do it without threading, but
will use this in the future to allow visualization of results in long
perf.data sessions while the entries are being processed.

The new 'top' tool will be the first user.

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-9b05atsn0q6m7fqgrug8fk2i@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      1980c2eb
  39. 30 9月, 2011 1 次提交
  41. 24 9月, 2011 1 次提交
    • D
      perf tool: Fix endianness handling of u32 data in samples · 936be503
      由 David Ahern 提交于 
      Currently, analyzing PPC data files on x86 the cpu field is always 0 and
the tid and pid are backwards. For example, analyzing a PPC file on PPC
the pid/tid fields show:

        rsyslogd  1210/1212

and analyzing the same PPC file using an x86 perf binary shows:

        rsyslogd  1212/1210

The problem is that the swap_op method for samples is
perf_event__all64_swap which assumes all elements in the sample_data
struct are u64s. cpu, tid and pid are u32s and need to be handled
individually. Given that the swap is done before the sample is parsed,
the simplest solution is to undo the 64-bit swap of those elements when
the sample is parsed and do the proper swap.

The RAW data field is generic and perf cannot have programmatic knowledge
of how to treat that data. Instead a warning is given to the user.

Thanks to Anton Blanchard for providing a data file for a mult-CPU
PPC system so I could verify the fix for the CPU fields.

v3 -> v4:
- fixed use of WARN_ONCE

v2 -> v3:
- used WARN_ONCE for message regarding raw data
- removed struct wrapper around union
- fixed whitespace issues

v1 -> v2:
- added a union for undoing the byte-swap on u64 and redoing swap on
  u32's to address compiler errors (see git commit 65014ab3)

Cc: Anton Blanchard <anton@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1315321946-16993-1-git-send-email-dsahern@gmail.comSigned-off-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      936be503
  43. 03 6月, 2011 2 次提交
  45. 02 6月, 2011 1 次提交
    • A
      perf evlist: Don't die if sample_{id_all|type} is invalid · c2a70653
      由 Arnaldo Carvalho de Melo 提交于 
      Fixes two more cases where the python binding would not load:

. Not finding die(), which it shouldn't anyway, not good to just stop the
  world because some particular perf.data file is invalid, just propagate
  the error to the caller.

. Not finding perf_sample_size: fix it by moving it from event.c to evsel,
  where it belongs, as most cases are moving to operate on an evsel object.o

One of the fixed problems:

[root@emilia ~]# python
>>> import perf
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /home/acme/git/build/perf/python/perf.so: undefined symbol: perf_sample_size
>>>
[root@emilia ~]#

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-1hkj7b2cvgbfnoizsekjb6c9@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      c2a70653
  47. 28 5月, 2011 1 次提交
    • D
      perf events: initialize fd array to -1 instead of 0 · 4af4c955
      由 David Ahern 提交于 
      perf_evsel__alloc_fd allocates an array of file descriptors with the
memory initialized to 0. The array has dimensions for cpus and threads.

Later, __perf_evsel__open calls sys_perf_event_open for each cpu and thread
dimensions. If the open fails for any of the cpus or threads then the fd's
for this event are closed and the fd entry in the array is set to -1. Now,
if the first attempt fails for the event (e.g., the event is not supported)
the remaining dimensions (cpu > 0 and thread > 0) are not touched and left
at the initialized value of 0.

builtin-stat catches ENOENT and ENOSYS failures and allows the command to
continue. The end result is that stat attempts to read from an fd of 0 which
of course is stdin and so the command hangs until you type ctrl-D.

Resolve by initializing the array to -1 since an fd < 0 is already
handled.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1306511914-8016-1-git-send-email-dsahern@gmail.comSigned-off-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      4af4c955
  49. 22 5月, 2011 2 次提交
  51. 15 4月, 2011 1 次提交
  53. 10 3月, 2011 1 次提交
    • A
      perf session: Use evlist/evsel for managing perf.data attributes · a91e5431
      由 Arnaldo Carvalho de Melo 提交于 
      So that we can reuse things like the id to attr lookup routine
(perf_evlist__id2evsel) that uses a hash table instead of the linear
lookup done in the older perf_header_attr routines, etc.

Also to make evsels/evlist more pervasive an API, simplyfing using the
emerging perf lib.

cc: Arun Sharma <arun@sharma-home.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      a91e5431
  55. 22 2月, 2011 1 次提交
    • A
      perf evsel: Fix inverted test for fixing up attr.inherit flag · e603dc15
      由 Arnaldo Carvalho de Melo 提交于 
      The kernel refuses mmapping an event with the inherit flag set for
something that is systemwide (cpu == -1), and the evsel layer got this
reversed at some point, fix it.

The symtom was that the --pid and --tid parameters for 'perf record' and
'perf top' returned with -EINVAL, like:

 # /tmp/build-perf/perf record -v -fo/tmp/perf.data -p 1042
   Warning:  ... trying to fall back to cpu-clock-ticks

   Fatal: failed to mmap with 22 (Invalid argument)
Reported-by: NDavid Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      e603dc15
  57. 17 2月, 2011 1 次提交
    • S
      perf: make perf stat print user provided full event names · f0c55bcf
      由 Stephane Eranian 提交于 
      This patch changes the way perf stat prints event names at the end of a
run. Until now, it was trying to reconstruct the event name from its
encoding. The problem is that it would only print generic events without
their modifiers (u, k, pp).

This patch saves the event name as passed by the user in the evsel
struct and uses it to print the final event name.

This would also work in case perf is linked with a library (such as
libpfm4) which provides full PMU event tables.

$ perf stat -e cycles:u,cycles:k date
Wed Feb 16 14:58:52 CET 2011

 Performance counter stats for 'date':

            568600 cycles:u
           2779715 cycles:k

        0.001908182  seconds time elapsed

Cc: Arun Sharma <arun@sharma-home.net>
Cc: David S. Miller <davem@davemloft.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@gmail.com>
LPU-Reference: <4d5bdc64.98a1df0a.7aa3.06c2@mx.google.com>
Signed-off-by: NStephane Eranian <eranian@google.com>
[ committer note: Fixed a merge problem with 023695d9 "Add cgroup support" ]
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      f0c55bcf
  59. 16 2月, 2011 1 次提交
    • S
      perf tool: Add cgroup support · 023695d9
      由 Stephane Eranian 提交于 
      This patch adds the ability to filter monitoring based on container groups
(cgroups) for both perf stat and perf record. It is possible to monitor
multiple cgroup in parallel. There is one cgroup per event. The cgroups to
monitor are passed via a new -G option followed by a comma separated list of
cgroup names.

The cgroup filesystem has to be mounted. Given a cgroup name, the perf tool
finds the corresponding directory in the cgroup filesystem and opens it. It
then passes that file descriptor to the kernel.

Example:

$ perf stat -B -a -e cycles:u,cycles:u,cycles:u -G test1,,test2 -- sleep 1
 Performance counter stats for 'sleep 1':

      2,368,667,414  cycles                   test1
      2,369,661,459  cycles
      <not counted>  cycles                   test2

        1.001856890  seconds time elapsed
Signed-off-by: NStephane Eranian <eranian@google.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4d590290.825bdf0a.7d0a.4890@mx.google.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      023695d9
  61. 04 2月, 2011 1 次提交
    • A
      perf stat: Fix aggreate counter reading accounting · 52bcd994
      由 Arnaldo Carvalho de Melo 提交于 
      Introduced in: c52b12ed, when this sequence:

  count[0] = count[1] = count[2] = 0;

Was replaced with:

  aggr->val = 0;

Which is equivalent to zeroing just the first entry in the 'count'
array.

Fix it by zeroing the three entries with:

  aggr->val = aggr->ena = aggr->run = 0;
Reported-by: NIngo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      52bcd994
  63. 30 1月, 2011 4 次提交
    • A
      perf evlist: Move evlist methods to evlist.c · f8a95309
      由 Arnaldo Carvalho de Melo 提交于 
      They were on evsel.c because they came from refactoring existing evsel
methods, so, to make reviewing the changes easier, I kept it there, now
its a plain move.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      f8a95309
    • A
      perf tools: Kill event_t typedef, use 'union perf_event' instead · 8115d60c
      由 Arnaldo Carvalho de Melo 提交于 
      And move the event_t methods to the perf_event__ too.

No code changes, just namespace consistency.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      8115d60c
    • A
      perf tools: Rename 'struct sample_data' to 'struct perf_sample' · 8d50e5b4
      由 Arnaldo Carvalho de Melo 提交于 
      Making the namespace more uniform.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      8d50e5b4
    • A
      perf evlist: Support non overwrite mode in perf_evlist__read_on_cpu · 7bb41152
      由 Arnaldo Carvalho de Melo 提交于 
      I.e. stash the overwrite mode in struct perf_evlist and act accordingly
in perf_evlist__read_on_cpu, not checking for overwrites and touching
the tail after consuming one event, like perf record does, for instance.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      7bb41152