• Josh Hunt's avatar
    perf/x86/intel: Restrict period on Nehalem · 44d3bbb6
    Josh Hunt authored
    We see our Nehalem machines reporting 'perfevents: irq loop stuck!' in
    some cases when using perf:
    
    perfevents: irq loop stuck!
    WARNING: CPU: 0 PID: 3485 at arch/x86/events/intel/core.c:2282 intel_pmu_handle_irq+0x37b/0x530
    ...
    RIP: 0010:intel_pmu_handle_irq+0x37b/0x530
    ...
    Call Trace:
    <NMI>
    ? perf_event_nmi_handler+0x2e/0x50
    ? intel_pmu_save_and_restart+0x50/0x50
    perf_event_nmi_handler+0x2e/0x50
    nmi_handle+0x6e/0x120
    default_do_nmi+0x3e/0x100
    do_nmi+0x102/0x160
    end_repeat_nmi+0x16/0x50
    ...
    ? native_write_msr+0x6/0x20
    ? native_write_msr+0x6/0x20
    </NMI>
    intel_pmu_enable_event+0x1ce/0x1f0
    x86_pmu_start+0x78/0xa0
    x86_pmu_enable+0x252/0x310
    __perf_event_task_sched_in+0x181/0x190
    ? __switch_to_asm+0x41/0x70
    ? __switch_to_asm+0x35/0x70
    ? __switch_to_asm+0x41/0x70
    ? __switch_to_asm+0x35/0x70
    finish_task_switch+0x158/0x260
    __schedule+0x2f6/0x840
    ? hrtimer_start_range_ns+0x153/0x210
    schedule+0x32/0x80
    schedule_hrtimeout_range_clock+0x8a/0x100
    ? hrtimer_init+0x120/0x120
    ep_poll+0x2f7/0x3a0
    ? wake_up_q+0x60/0x60
    do_epoll_wait+0xa9/0xc0
    __x64_sys_epoll_wait+0x1a/0x20
    do_syscall_64+0x4e/0x110
    entry_SYSCALL_64_after_hwframe+0x44/0xa9
    RIP: 0033:0x7fdeb1e96c03
    ...
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: acme@kernel.org
    Cc: Josh Hunt <johunt@akamai.com>
    Cc: bpuranda@akamai.com
    Cc: mingo@redhat.com
    Cc: jolsa@redhat.com
    Cc: tglx@linutronix.de
    Cc: namhyung@kernel.org
    Cc: alexander.shishkin@linux.intel.com
    Link: https://lkml.kernel.org/r/1566256411-18820-1-git-send-email-johunt@akamai.com
    44d3bbb6
core.c 144 KB