1. 13 Feb, 2012 1 commit
  2. 09 Feb, 2012 2 commits
    • David Ahern's avatar
      perf record: No build id option fails · d3665498
      David Ahern authored
      A recent refactoring of perf-record introduced the following:
      
      perf record -a -B
      Couldn't generating buildids. Use --no-buildid to profile anyway.
      sleep: Terminated
      
      I believe the triple negative was meant to be only a double negative.
      :-) While I'm there, fixed the grammar on the error message.
      
      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: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1328567272-13190-1-git-send-email-dsahern@gmail.comSigned-off-by: default avatarDavid Ahern <dsahern@gmail.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      d3665498
    • Stephane Eranian's avatar
      perf tools: fix endianness detection in perf.data · 73323f54
      Stephane Eranian authored
      The current version of perf detects whether or not the perf.data file is
      written in a different endianness using the attr_size field in the
      header of the file. This field represents sizeof(struct perf_event_attr)
      as known to perf record. If the sizes do not match, then perf tries the
      byte-swapped version. If they match, then the tool assumes a different
      endianness.
      
      The issue with the approach is that it assumes the size of
      perf_event_attr always has to match between perf record and perf report.
      However, the kernel perf_event ABI is extensible.  New fields can be
      added to struct perf_event_attr. Consequently, it is not possible to use
      attr_size to detect endianness.
      
      This patch takes another approach by using the magic number written at
      the beginning of the perf.data file to detect endianness. The magic
      number is an eight-byte signature.  It's primary purpose is to identify
      (signature) a perf.data file. But it could also be used to encode the
      endianness.
      
      The patch introduces a new value for this signature. The key difference
      is that the signature is written differently in the file depending on
      the endianness. Thus, by comparing the signature from the file with the
      tool's own signature it is possible to detect endianness. The new
      signature is "PERFILE2".
      
      Backward compatiblity with existing perf.data file is ensured.
      Tested-by: default avatarDavid Ahern <dsahern@gmail.com>
      Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
      Cc: Arun Sharma <asharma@fb.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Roberto Agostino Vitillo <ravitillo@lbl.gov>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Vince Weaver <vweaver1@eecs.utk.edu>
      Link: http://lkml.kernel.org/r/1328187288-24395-15-git-send-email-eranian@google.comSigned-off-by: default avatarStephane Eranian <eranian@google.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      73323f54
  3. 07 Feb, 2012 3 commits
  4. 06 Feb, 2012 8 commits
  5. 03 Feb, 2012 1 commit
    • Stephane Eranian's avatar
      perf: Remove deprecated WARN_ON_ONCE() · 84f2b9b2
      Stephane Eranian authored
      With the new throttling/unthrottling code introduced with
      commit:
      
        e050e3f0 ("perf: Fix broken interrupt rate throttling")
      
      we occasionally hit two WARN_ON_ONCE() checks in:
      
        - intel_pmu_pebs_enable()
        - intel_pmu_lbr_enable()
        - x86_pmu_start()
      
      The assertions are no longer problematic. There is a valid
      path where they can trigger but it is harmless.
      
      The assertion can be triggered with:
      
        $ perf record -e instructions:pp ....
      
      Leading to paths:
      
        intel_pmu_pebs_enable
        intel_pmu_enable_event
        x86_perf_event_set_period
        x86_pmu_start
        perf_adjust_freq_unthr_context
        perf_event_task_tick
        scheduler_tick
      
      And:
      
        intel_pmu_lbr_enable
        intel_pmu_enable_event
        x86_perf_event_set_period
        x86_pmu_start
        perf_adjust_freq_unthr_context.
        perf_event_task_tick
        scheduler_tick
      
      cpuc->enabled is always on because when we get to
      perf_adjust_freq_unthr_context() the PMU is not totally
      disabled. Furthermore when we need to adjust a period,
      we only stop the event we need to change and not the
      entire PMU. Thus, when we re-enable, cpuc->enabled is
      already set. Note that when we stop the event, both
      pebs and lbr are stopped if necessary (and possible).
      Signed-off-by: default avatarStephane Eranian <eranian@google.com>
      Cc: peterz@infradead.org
      Link: http://lkml.kernel.org/r/20120202110401.GA30911@quadSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
      84f2b9b2
  6. 02 Feb, 2012 22 commits
  7. 01 Feb, 2012 3 commits