linux.git/tools/lib/traceevent, branch v4.3-rc2

tools lib traceeveent: Allow for negative numbers in print format

2015-08-28T14:47:40+00:00

It was reported that "%-8s" does not parse well when used in the printk
format. The '-' is what is throwing it off. Allow that to be included.

Reporter note:

Example before:

  transhuge-stres-10730 [004]  5897.713989: mm_compaction_finished: node=0
  zone=>-<8s order=-2119871790 ret=

Example after:

  transhuge-stres-4235  [000]   453.149280: mm_compaction_finished: node=0
  zone=ffffffff81815d7a order=9 ret=

(I will send patches to fix the string handling in the tracepoints so
it's on par with in-kernel printing via trace_pipe:)

  transhuge-stres-10921 [007] ...1  6307.140205: mm_compaction_finished: node=0
  zone=Normal   order=9 ret=partial

Reported-by: Vlastimil Babka 
Signed-off-by: Steven Rostedt 
Tested-by: Vlastimil Babka 
Cc: Namhyung Kim 
Link: http://lkml.kernel.org/r/20150827094601.46518bcc@gandalf.local.home
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Add checks for returned EVENT_ERROR type

2015-08-21T13:35:09+00:00

Running the following perf-stat command on an arm64 system produces the
following result...

  [root@aarch64 ~]# perf stat -e kmem:mm_page_alloc -a sleep 1
    Warning: [kmem:mm_page_alloc] function sizeof not defined
    Warning: Error: expected type 4 but read 0
  Segmentation fault
  [root@aarch64 ~]#

The second warning was a result of the first warning not stopping
processing after it detected the issue.

That is, code that found the issue reported the first problem, but
because it did not exit out of the functions smoothly, it caused the
other warning to appear and not only that, it later caused the SIGSEGV.

Signed-off-by: Dean Nelson 
Reviewed-by: Steven Rostedt 
Acked-by: Namhyung Kim 
Cc: Jiri Olsa 
Cc: Peter Zijlstra 
Link: http://lkml.kernel.org/r/20150820151632.13927.13791.email-sent-by-dnelson@teal
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Allow setting an alternative symbol resolver

2015-07-24T01:01:26+00:00

The perf tools have a symbol resolver that includes solving kernel
symbols using either kallsyms or ELF symtabs, and it also is using
libtraceevent to format the trace events fields, including via
subsystem specific plugins, like the "timer" one.

To solve fields like "timer:hrtimer_start"'s "function", libtraceevent
needs a way to map from its value to a function name and addr.

This patch provides a way for tools that already have symbol resolving
facilities to ask libtraceevent to use it when needing to resolve
kernel symbols.

Reviewed-by: Steven Rostedt 
Acked-by: David Ahern 
Cc: Adrian Hunter 
Cc: Borislav Petkov 
Cc: Frederic Weisbecker 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Stephane Eranian 
Link: http://lkml.kernel.org/n/tip-fdx1fazols17w5py26ia3bwh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

tools lib: Improve clean target

2015-07-08T20:56:13+00:00

The clean targets miss some .cmd and .d files.

Signed-off-by: Riku Voipio 
Cc: Peter Zijlstra 
Cc: linux-kbuild@vger.kernel.org
Link: http://lkml.kernel.org/r/1434631938-12681-1-git-send-email-riku.voipio@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Ignore libtrace-dynamic-list file

2015-06-08T13:30:32+00:00

The libtrace-dynamic-list file is used to export symbols used by
traceevent plugins.

Signed-off-by: He Kuang 
Cc: Jiri Olsa 
Cc: Peter Zijlstra 
Cc: Wang Nan 
Link: http://lkml.kernel.org/r/1432819735-35040-2-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Export dynamic symbols used by traceevent plugins

2015-06-08T13:30:31+00:00

Traceevent plugins need dynamic symbols exported from libtraceevent.a,
otherwise a dlopen error will occur during plugins loading.

This patch uses dynamic-list-file to export dynamic symbols which will
be used in plugins to perf executable.

The problem is covered up if feature-libpython is enabled, because
PYTHON_EMBED_LDOPTS contains '-Xlinker --export-dynamic' which adds all
symbols to the dynamic symbol table. So we should reproduce the problem
by setting NO_LIBPYTHON=1.

Before this patch:

  (Prepare plugins)
  $ ls /root/.traceevent/plugins/
  plugin_sched_switch.so
  plugin_function.so
  ...

  $ perf record -e 'ftrace:function' ls

  $ perf script
    Warning: could not load plugin '/mnt/data/root/.traceevent/plugins/plugin_sched_switch.so'
    /root/.traceevent/plugins/plugin_sched_switch.so: undefined symbol: pevent_unregister_event_handler

    Warning: could not load plugin '/root/.traceevent/plugins/plugin_function.so'
    /root/.traceevent/plugins/plugin_function.so: undefined symbol: warning
    ...
           :1049  1049 [000]  9666.754487: ftrace:function:  ffffffff8118bc50 <-- ffffffff8118c5b3
           :1049  1049 [000]  9666.754487: ftrace:function:  ffffffff818e2440 <-- ffffffff8118bc75
           :1049  1049 [000]  9666.754487: ftrace:function:  ffffffff8106eee0 <-- ffffffff811212e2

After this patch:

  $ perf record -e 'ftrace:function' ls
  $ perf script
           :1049  1049 [000]  9666.754487: ftrace:function: __set_task_comm
           :1049  1049 [000]  9666.754487: ftrace:function:    _raw_spin_lock
           :1049  1049 [000]  9666.754487: ftrace:function: task_tgid_nr_ns
           ...

Signed-off-by: He Kuang 
Acked-by: Jiri Olsa 
Cc: Peter Zijlstra 
Cc: Wang Nan 
Link: http://lkml.kernel.org/r/1432819735-35040-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Install libtraceevent.a into libdir

2015-05-18T15:36:25+00:00

Before this patch, 'make install' installs libraries into bindir:

  $ make install DESTDIR=./tree
   INSTALL  trace_plugins
   INSTALL  libtraceevent.a
   INSTALL  libtraceevent.so
  $ find ./tree
   ./tree/
   ./tree/usr
   ./tree/usr/local
   ./tree/usr/local/bin
   ./tree/usr/local/bin/libtraceevent.a
   ./tree/usr/local/bin/libtraceevent.so
   ...

/usr/local/lib( or lib64) should be a better place.

This patch replaces 'bin' with libdir. For __LP64__ building, libraries
are installed to /usr/local/lib64. For other building, to
/usr/local/lib instead.

After applying this patch:

  $ make install DESTDIR=./tree
   INSTALL  trace_plugins
   INSTALL  libtraceevent.a
   INSTALL  libtraceevent.so
  $ find ./tree
   ./tree
   ./tree/usr
   ./tree/usr/local
   ./tree/usr/local/lib64
   ./tree/usr/local/lib64/libtraceevent.a
   ./tree/usr/local/lib64/traceevent
   ./tree/usr/local/lib64/traceevent/plugins
   ./tree/usr/local/lib64/traceevent/plugins/plugin_mac80211.so
   ./tree/usr/local/lib64/traceevent/plugins/plugin_hrtimer.so
   ...
   ./tree/usr/local/lib64/libtraceevent.so

Signed-off-by: Wang Nan 
Acked-by: Jiri Olsa 
Acked-by: Steven Rostedt 
Cc: Alexei Starovoitov 
Cc: Brendan Gregg 
Cc: Daniel Borkmann 
Cc: David Ahern 
Cc: Masami Hiramatsu 
Cc: Namhyung Kim 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: pi3orama@163.com
Cc: Zefan Li 
Link: http://lkml.kernel.org/r/1431860222-61636-4-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo

tools lib traceevent: Provide le16toh define for older systems

2015-05-14T15:28:11+00:00

Where such macro is not present, so just copy its definition from
glibc's endian.h and define it if not already.

Cc: Adrian Hunter 
Cc: Borislav Petkov 
Cc: David Ahern 
Cc: Don Zickus 
Cc: Frederic Weisbecker 
Cc: Jiri Olsa 
Cc: Namhyung Kim 
Cc: Stephane Eranian 
Cc: Steven Rostedt 
Link: http://lkml.kernel.org/n/tip-4j90i2na07ppidt0z6cbuxr7@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo

Merge branch 'perf/urgent' into perf/core, to resolve conflicts

2015-05-11T09:56:27+00:00

Conflicts:
	tools/perf/builtin-kmem.c

Signed-off-by: Ingo Molnar

Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-05-06T17:47:25+00:00

Pull perf fixes from Ingo Molnar:
 "Mostly tooling fixes, but also an uncore PMU driver fix and an uncore
  PMU driver hardware-enablement addition"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf probe: Fix segfault if passed with ''.
  perf report: Fix -T/--threads option to work again
  perf bench numa: Fix immediate meeting of convergence condition
  perf bench numa: Fixes of --quiet argument
  perf bench futex: Fix hung wakeup tasks after requeueing
  perf probe: Fix bug with global variables handling
  perf top: Fix a segfault when kernel map is restricted.
  tools lib traceevent: Fix build failure on 32-bit arch
  perf kmem: Fix compiles on RHEL6/OL6
  tools lib api: Undefine _FORTIFY_SOURCE before setting it
  perf kmem: Consistently use PRIu64 for printing u64 values
  perf trace: Disable events and drain events when forked workload ends
  perf trace: Enable events when doing system wide tracing and starting a workload
  perf/x86/intel/uncore: Move PCI IDs for IMC to uncore driver
  perf/x86/intel/uncore: Add support for Intel Haswell ULT (lower power Mobile Processor) IMC uncore PMUs
  perf/x86/intel: Add cpu_(prepare|starting|dying) for core_pmu