forked from luck/tmp_suning_uos_patched
137351e0fe
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: Steven Rostedt <rostedt@goodmis.org> Tested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Cyrill 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: Ingo Molnar <mingo@elte.hu> |
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