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authorWu Zhangjin <wuzhangjin@gmail.com>2010-03-10 00:27:28 +0800
committerRalf Baechle <ralf@linux-mips.org>2010-04-12 17:26:10 +0100
commit7a7ac952d5217b2f568e5ef91ac39b572e166f24 (patch)
treefc7313875b4d5e8e833da49b35d8b0ea2959d508
parentabe5b417fb4a52e9510fdb5a16e722e91bf89e92 (diff)
downloadop-kernel-dev-7a7ac952d5217b2f568e5ef91ac39b572e166f24.zip
op-kernel-dev-7a7ac952d5217b2f568e5ef91ac39b572e166f24.tar.gz
MIPS: Trace: Don't trace irqsoff for the idle process
Like x86 did in arch/x86/kernel/{process_32.c,process_64.c}, 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 the idle process, the max duration of irqsoff will be the idle time and make the irqsoff tracer useless. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Patchwork: http://patchwork.linux-mips.org/patch/1044/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
-rw-r--r--arch/mips/kernel/process.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 463b71b..9996094 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -63,8 +63,13 @@ 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) &&
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