Messages in this thread Patch in this message | | | From | Zhizhou Zhang <> | Subject | [PATCH] arm64: don't account for cpu offline time with irqsoff tracer | Date | Wed, 5 Sep 2018 16:19:43 +0800 |
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This is no need to account for cpu offline time with irqsoff tracer. We can trigger a large irqsoff latency with below commands:
$ echo irqsoff > /sys/kernel/debug/tracing/current_tracer $ echo 0 > /sys/kernel/debug/tracing/options/function-trace $ echo 1 > /sys/kernel/debug/tracing/tracing_on $ echo 0 > /sys/devices/system/cpu/cpu1/online $ # wait a while ... $ echo 1 > /sys/devices/system/cpu/cpu1/online $ cat /sys/kernel/debug/tracing/trace
Signed-off-by: Zhizhou Zhang <zhizhouzhang@asrmicro.com> --- arch/arm64/kernel/smp.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index 25fcd22..faed8f6 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -346,6 +346,7 @@ void cpu_die(void) idle_task_exit(); local_daif_mask(); + stop_critical_timings(); /* Tell __cpu_die() that this CPU is now safe to dispose of */ (void)cpu_report_death(); -- 1.9.1
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