| From 5a0f82bb6118fb1c51e6516ffc3377d7e5e1ef39 Mon Sep 17 00:00:00 2001 |
| From: Wu Zhangjin <wuzhangjin@gmail.com> |
| Date: Tue, 9 Mar 2010 17:22:18 +0800 |
| Subject: [PATCH] MIPS: Don't trace irqsoff for idle |
| |
| commit 5a0f82bb6118fb1c51e6516ffc3377d7e5e1ef39 in tip. |
| |
| As the X86 platform did in arch/x86/kernel/{process_32.c,process_64.c}, |
| we also don't trace irqsoff for idle. |
| |
| If "There's no useful work to be done", we don't care about the irqsoff |
| duration. If we trace for idle, the max duration of irqsoff will be |
| always as the idle time and eventually make the irqsoff tracer out of |
| action. |
| |
| Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> |
| |
| diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c |
| index f3d73e1..87316fc 100644 |
| --- a/arch/mips/kernel/process.c |
| +++ b/arch/mips/kernel/process.c |
| @@ -64,8 +64,12 @@ void __noreturn cpu_idle(void) |
| |
| smtc_idle_loop_hook(); |
| #endif |
| - if (cpu_wait) |
| + if (cpu_wait) { |
| + /* Don't trace irqs off for idle */ |
| + stop_critical_timings(); |
| (*cpu_wait)(); |
| + start_critical_timings(); |
| + } |
| } |
| #ifdef CONFIG_HOTPLUG_CPU |
| if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) && |
| -- |
| 1.7.1.1 |
| |
