• Linus Torvalds's avatar
    Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 8f55cea4
    Linus Torvalds authored
    Pull perf changes from Ingo Molnar:
     "There are lots of improvements, the biggest changes are:
      Main kernel side changes:
       - Improve uprobes performance by adding 'pre-filtering' support, by
         Oleg Nesterov.
       - Make some POWER7 events available in sysfs, equivalent to what was
         done on x86, from Sukadev Bhattiprolu.
       - tracing updates by Steve Rostedt - mostly misc fixes and smaller
       - Use perf/event tracing to report PCI Express advanced errors, by
         Tony Luck.
       - Enable northbridge performance counters on AMD family 15h, by Jacob
       - This tracing commit:
            tracing: Remove the extra 4 bytes of padding in events
         changes the ABI.  All involved parties (PowerTop in particular)
         seem to agree that it's safe to do now with the introduction of
         libtraceevent, but the devil is in the details ...
      Main tooling side changes:
       - Add 'event group view', from Namyung Kim:
         To use it, 'perf record' should group events when recording.  And
         then perf report parses the saved group relation from file header
         and prints them together if --group option is provided.  You can
         use the 'perf evlist' command to see event group information:
            $ perf record -e '{ref-cycles,cycles}' noploop 1
            [ perf record: Woken up 2 times to write data ]
            [ perf record: Captured and wrote 0.385 MB perf.data (~16807 samples) ]
            $ perf evlist --group
         With this example, default perf report will show you each event
         You can use --group option to enable event group view:
            $ perf report --group
            # group: {ref-cycles,cycles}
            # ========
            # Samples: 7K of event 'anon group { ref-cycles, cycles }'
            # Event count (approx.): 6876107743
            #         Overhead  Command      Shared Object                      Symbol
            # ................  .......  .................  ..........................
                99.84%  99.76%  noploop  noploop            [.] main
                 0.07%   0.00%  noploop  ld-2.15.so         [.] strcmp
                 0.03%   0.00%  noploop  [kernel.kallsyms]  [k] timerqueue_del
                 0.03%   0.03%  noploop  [kernel.kallsyms]  [k] sched_clock_cpu
                 0.02%   0.00%  noploop  [kernel.kallsyms]  [k] account_user_time
                 0.01%   0.00%  noploop  [kernel.kallsyms]  [k] __alloc_pages_nodemask
                 0.00%   0.00%  noploop  [kernel.kallsyms]  [k] native_write_msr_safe
                 0.00%   0.11%  noploop  [kernel.kallsyms]  [k] _raw_spin_lock
                 0.00%   0.06%  noploop  [kernel.kallsyms]  [k] find_get_page
                 0.00%   0.02%  noploop  [kernel.kallsyms]  [k] rcu_check_callbacks
                 0.00%   0.02%  noploop  [kernel.kallsyms]  [k] __current_kernel_time
         As you can see the Overhead column now contains both of ref-cycles
         and cycles and header line shows group information also - 'anon
         group { ref-cycles, cycles }'.  The output is sorted by period of
         group leader first.
       - Initial GTK+ annotate browser, from Namhyung Kim.
       - Add option for runtime switching perf data file in perf report,
         just press 's' and a menu with the valid files found in the current
         directory will be presented, from Feng Tang.
       - Add support to display whole group data for raw columns, from Jiri
       - Add per processor socket count aggregation in perf stat, from
         Stephane Eranian.
       - Add interval printing in 'perf stat', from Stephane Eranian.
       - 'perf test' improvements
       - Add support for wildcards in tracepoint system name, from Jiri
       - Add anonymous huge page recognition, from Joshua Zhu.
       - perf build-id cache now can show DSOs present in a perf.data file
         that are not in the cache, to integrate with build-id servers being
         put in place by organizations such as Fedora.
       - perf top now shares more of the evsel config/creation routines with
         'record', paving the way for further integration like 'top'
         snapshots, etc.
       - perf top now supports DWARF callchains.
       - Fix mmap limitations on 32-bit, fix from David Miller.
       - 'perf bench numa mem' NUMA performance measurement suite
       - ... and lots of fixes, performance improvements, cleanups and other
         improvements I failed to list - see the shortlog and git log for
    * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (270 commits)
      perf/x86/amd: Enable northbridge performance counters on AMD family 15h
      perf/hwbp: Fix cleanup in case of kzalloc failure
      perf tools: Fix build with bison 2.3 and older.
      perf tools: Limit unwind support to x86 archs
      perf annotate: Make it to be able to skip unannotatable symbols
      perf gtk/annotate: Fail early if it can't annotate
      perf gtk/annotate: Show source lines with gray color
      perf gtk/annotate: Support multiple event annotation
      perf ui/gtk: Implement basic GTK2 annotation browser
      perf annotate: Fix warning message on a missing vmlinux
      perf buildid-cache: Add --update option
      uprobes/perf: Avoid uprobe_apply() whenever possible
      uprobes/perf: Teach trace_uprobe/perf code to use UPROBE_HANDLER_REMOVE
      uprobes/perf: Teach trace_uprobe/perf code to pre-filter
      uprobes/perf: Teach trace_uprobe/perf code to track the active perf_event's
      uprobes: Introduce uprobe_apply()
      perf: Introduce hw_perf_event->tp_target and ->tp_list
      uprobes/perf: Always increment trace_uprobe->nhit
      uprobes/tracing: Kill uprobe_trace_consumer, embed uprobe_consumer into trace_uprobe
      uprobes/tracing: Introduce is_trace_uprobe_enabled()
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