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| author | Zhang Jiejing <jiejing.zhang@freescale.com> | 2010-11-25 12:56:04 +0800 |
|---|---|---|
| committer | Zhang Jiejing <jiejing.zhang@freescale.com> | 2010-11-30 12:54:47 +0800 |
| commit | 976be1ff478c98856e771d0e6165fa530968f926 (patch) | |
| tree | c90fbb16dbc18d5731bf2b9c03027930acd54eae | |
| parent | b70f3502d624ef1a47dc9218746088c0f2afb5a7 (diff) | |
ENGR00134043-1: PM: change device suspend time debug driver to default off.
the default state of suspend driver is default off,
if you want to debug the suspend time, echo time in
microsecond(u Second) to /sys/powe/device_suspend_time_threshold
eg: I want to know which driver suspend & resume takes
more that 0.5 ms (500 us), you can just :
ehco 500 > /sys/power/device_suspend_time_threshold
Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>
| -rw-r--r-- | kernel/power/main.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index 0b9497851a9a..bfb684a4d412 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -234,13 +234,17 @@ power_attr(pm_trace); * threshold of device suspend time consumption in microsecond(0.5ms), the * driver suspend/resume time longer than this threshold will be * print to console, 0 to disable */ -int device_suspend_time_threshold = 500; +int device_suspend_time_threshold; static ssize_t device_suspend_time_threshold_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", device_suspend_time_threshold); + if (device_suspend_time_threshold == 0) + return sprintf(buf, "off\n"); + else + return sprintf(buf, "%d usecs\n", + device_suspend_time_threshold); } static ssize_t |