On Thu, Jun 04, 2015 at 03:20:57PM -0700, Stephen Boyd wrote: > On 06/04, Felipe Balbi wrote: > > On Thu, Jun 04, 2015 at 03:18:25PM -0500, Felipe Balbi wrote: > > > On Thu, Jun 04, 2015 at 03:08:50PM -0500, Felipe Balbi wrote: > > > > Hi, > > > > > > > > On Thu, Jun 04, 2015 at 11:46:59AM +0200, Mason wrote: > > > > > Also, check /proc/timer_list for a "Broadcast device". If you don't > > > > > define one, the TWD timers are set to periodic mode, with hrtimers > > > > > disabled. > > > > > > > > Did you manage to turn global timer into Broadcast device ? > > > > > > arm_global_timer is marked PERCPU, so it will never be chosen as > > > broadcast. > > > > Perhaps this is acceptable ? > > > > diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c > > index e6833771a716..8c0170ac367d 100644 > > --- a/drivers/clocksource/arm_global_timer.c > > +++ b/drivers/clocksource/arm_global_timer.c > > @@ -169,8 +169,9 @@ static int gt_clockevents_init(struct clock_event_device *clk) > > int cpu = smp_processor_id(); > > > > clk->name = "arm_global_timer"; > > - clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT | > > - CLOCK_EVT_FEAT_PERCPU; > > + clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; > > + if (is_smp() || setup_max_cpus) > > + clk->features |= CLOCK_EVT_FEAT_PERCPU; > > clk->set_mode = gt_clockevent_set_mode; > > clk->set_next_event = gt_clockevent_set_next_event; > > clk->cpumask = cpumask_of(cpu); > > > > What is this doing? Allowing the global timer to become the > broadcast timer? Can you share all the clockevents that are being yeah, as long as have single CPU. > registered in the system and what ratings and features they have? Timer List Version: v0.7 HRTIMER_MAX_CLOCK_BASES: 4 now at 126645624877 nsecs cpu: 0 clock 0: .base: eeec36b8 .index: 0 .resolution: 1 nsecs .get_time: ktime_get .offset: 0 nsecs active timers: #0: <eeec3970>, tick_sched_timer, S:01 # expires at 126646000000-126646000000 nsecs [in 375123 to 375123 nsecs] #1: def_rt_bandwidth, sched_rt_period_timer, S:01 # expires at 127000000000-127000000000 nsecs [in 354375123 to 354375123 nsecs] #2: <ed07ff28>, hrtimer_wakeup, S:01 # expires at 135190356958-135190406958 nsecs [in 8544732081 to 8544782081 nsecs] #3: <ed17bb40>, timerfd_tmrproc, S:01 # expires at 136961414000-136961414000 nsecs [in 10315789123 to 10315789123 nsecs] #4: <ed17bcc0>, timerfd_tmrproc, S:01 # expires at 156961414000-156961414000 nsecs [in 30315789123 to 30315789123 nsecs] #5: <ed1fde40>, timerfd_tmrproc, S:01 # expires at 157211414000-157211414000 nsecs [in 30565789123 to 30565789123 nsecs] #6: <ed143c00>, timerfd_tmrproc, S:01 # expires at 180211414000-180211414000 nsecs [in 53565789123 to 53565789123 nsecs] #7: <ee43d0c0>, timerfd_tmrproc, S:01 # expires at 305461414000-305461414000 nsecs [in 178815789123 to 178815789123 nsecs] #8: <ed11fae0>, hrtimer_wakeup, S:01 # expires at 606265898975-606365898975 nsecs [in 479620274098 to 479720274098 nsecs] #9: sched_clock_timer, sched_clock_poll, S:01 # expires at 1924145348608-1924145348608 nsecs [in 1797499723731 to 1797499723731 nsecs] clock 1: .base: eeec36f8 .index: 1 .resolution: 1 nsecs .get_time: ktime_get_real .offset: 1433450686592811401 nsecs active timers: #0: <ee43cc00>, timerfd_tmrproc, S:01 # expires at 2147483647000000000-2147483647000000000 nsecs [in 2147483520354375123 to 2147483520354375123 nsecs] clock 2: .base: eeec3738 .index: 2 .resolution: 1 nsecs .get_time: ktime_get_boottime .offset: 0 nsecs active timers: clock 3: .base: eeec3778 .index: 3 .resolution: 1 nsecs .get_time: ktime_get_clocktai .offset: 1433450686592811401 nsecs active timers: .expires_next : 126646000000 nsecs .hres_active : 1 .nr_events : 6888 .nr_retries : 0 .nr_hangs : 0 .max_hang_time : 0 nsecs .nohz_mode : 2 .last_tick : 126639000000 nsecs .tick_stopped : 0 .idle_jiffies : 4294793935 .idle_calls : 3733 .idle_sleeps : 1759 .idle_entrytime : 126644701595 nsecs .idle_waketime : 126640000808 nsecs .idle_exittime : 126640012942 nsecs .idle_sleeptime : 121454496379 nsecs .iowait_sleeptime: 23896349 nsecs .last_jiffies : 4294793940 .next_jiffies : 4294793941 .idle_expires : 126640000000 nsecs jiffies: 4294793941 Tick Device: mode: 1 Broadcast device Clock Event Device: arm_global_timer max_delta_ns: 4294967295 min_delta_ns: 1000 mult: 2147483648 shift: 31 mode: 1 next_event: 9223372036854775807 nsecs set_next_event: gt_clockevent_set_next_event set_mode: gt_clockevent_set_mode event_handler: tick_handle_oneshot_broadcast retries: 0 tick_broadcast_mask: 00000000 tick_broadcast_oneshot_mask: 00000000 Tick Device: mode: 1 Per CPU device: 0 Clock Event Device: local_timer max_delta_ns: 4294967295 min_delta_ns: 1000 mult: 2147483648 shift: 31 mode: 3 next_event: 126646000000 nsecs set_next_event: twd_set_next_event set_mode: twd_set_mode event_handler: hrtimer_interrupt retries: 0 -- balbi
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