1. 08 5月, 2010 3 次提交
    • C
      x86, perf: P4 PMU -- Get rid of redundant check for array index · 3f51b711
      Cyrill Gorcunov 提交于
      The caller already has done such a check.
      And it was wrong anyway, it had to be '>=' rather than '>'
      Signed-off-by: NCyrill Gorcunov <gorcunov@openvz.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      LKML-Reference: <20100508112717.130386882@openvz.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3f51b711
    • C
      x86, perf: P4 PMU -- protect sensible procedures from preemption · 137351e0
      Cyrill Gorcunov 提交于
      Steven reported:
      
      |
      | I'm getting:
      |
      | Pid: 3477, comm: perf Not tainted 2.6.34-rc6 #2727
      | Call Trace:
      |  [<ffffffff811c7565>] debug_smp_processor_id+0xd5/0xf0
      |  [<ffffffff81019874>] p4_hw_config+0x2b/0x15c
      |  [<ffffffff8107acbc>] ? trace_hardirqs_on_caller+0x12b/0x14f
      |  [<ffffffff81019143>] hw_perf_event_init+0x468/0x7be
      |  [<ffffffff810782fd>] ? debug_mutex_init+0x31/0x3c
      |  [<ffffffff810c68b2>] T.850+0x273/0x42e
      |  [<ffffffff810c6cab>] sys_perf_event_open+0x23e/0x3f1
      |  [<ffffffff81009e6a>] ? sysret_check+0x2e/0x69
      |  [<ffffffff81009e32>] system_call_fastpath+0x16/0x1b
      |
      | When running perf record in latest tip/perf/core
      |
      
      Due to the fact that p4 counters are shared between HT threads
      we synthetically divide the whole set of counters into two
      non-intersected subsets. And while we're "borrowing" counters
      from these subsets we should not be preempted (well, strictly
      speaking in p4_hw_config we just pre-set reference to the
      subset which allow to save some cycles in schedule routine
      if it happens on the same cpu). So use get_cpu/put_cpu pair.
      
      Also p4_pmu_schedule_events should use smp_processor_id rather
      than raw_ version. This allow us to catch up preemption issue
      (if there will ever be).
      Reported-by: NSteven Rostedt <rostedt@goodmis.org>
      Tested-by: NSteven Rostedt <rostedt@goodmis.org>
      Signed-off-by: NCyrill Gorcunov <gorcunov@openvz.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      LKML-Reference: <20100508112716.963478928@openvz.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      137351e0
    • C
      x86, perf: P4 PMU -- configure predefined events · de902d96
      Cyrill Gorcunov 提交于
      If an event is not RAW we should not exit p4_hw_config
      early but call x86_setup_perfctr as well.
      Signed-off-by: NCyrill Gorcunov <gorcunov@openvz.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Lin Ming <ming.m.lin@intel.com>
      Cc: Robert Richter <robert.richter@amd.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      de902d96
  2. 07 5月, 2010 9 次提交
  3. 05 5月, 2010 1 次提交
  4. 03 5月, 2010 2 次提交
  5. 01 5月, 2010 25 次提交