• Zhou Chengming's avatar
    perf/x86/intel: Handle exclusive threadid correctly on CPU hotplug · 4e71de79
    Zhou Chengming authored
    The CPU hotplug function intel_pmu_cpu_starting() sets
    cpu_hw_events.excl_thread_id unconditionally to 1 when the shared exclusive
    counters data structure is already availabe for the sibling thread.
    This works during the boot process because the first sibling gets threadid
    0 assigned and the second sibling which shares the data structure gets 1.
    But when the first thread of the core is offlined and onlined again it
    shares the data structure with the second thread and gets exclusive thread
    id 1 assigned as well.
    Prevent this by checking the threadid of the already online thread.
    [ tglx: Rewrote changelog ]
    Signed-off-by: default avatarZhou Chengming <zhouchengming1@huawei.com>
    Cc: NuoHan Qiao <qiaonuohan@huawei.com>
    Cc: ak@linux.intel.com
    Cc: peterz@infradead.org
    Cc: kan.liang@intel.com
    Cc: dave.hansen@linux.intel.com
    Cc: eranian@google.com
    Cc: qiaonuohan@huawei.com
    Cc: davidcc@google.com
    Cc: guohanjun@huawei.com
    Link: http://lkml.kernel.org/r/1484536871-3131-1-git-send-email-zhouchengming1@huawei.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    ---					---
     arch/x86/events/intel/core.c |    7 +++++--
     1 file changed, 5 insertions(+), 2 deletions(-)
core.c 115 KB