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SubjectRe: [PATCH v2] power: new trace event to print device suspend and resume time
Date
On 07/17/2013 10:35 AM, Steven Rostedt wrote:
> On Wed, 2013-07-17 at 09:57 -0600, Shuah Khan wrote:
>
>> +TRACE_EVENT(device_pm_report_time,
>> +
>> + TP_PROTO(const char *device, const char *driver, const char *parent,
>> + const char *pm_ops, ktime_t ops_time, char *pm_event_str,
>> + int error),
>> +
>> + TP_ARGS(device, driver, parent, pm_ops, ops_time, pm_event_str, error),
>> +
>> + TP_STRUCT__entry(
>> + __string(device, device)
>> + __string(driver, driver)
>> + __string(parent, parent)
>> + __string(pm_ops, pm_ops)
>> + __string(pm_event_str, pm_event_str)
>> + __field(s64, ops_time)
>> + __field(int, error)
>> + ),
>> +
>> + TP_fast_assign(
>> + __assign_str(device, device);
>> + __assign_str(driver, driver);
>> + __assign_str(parent, parent);
>> + __assign_str(pm_ops, pm_ops);
>> + __assign_str(pm_event_str, pm_event_str);
>> + __entry->ops_time = ktime_to_ns(ops_time) >> 10;
>
> You may want to just record the ops_time, and do the conversion in the
> TP_printk(). This is the fast path, and any calculations done here just
> increases the overhead of the trace point.
>
> -- Steve

Thanks for the review and pointing the overhead out. Will fix that.

-- Shuah

--
Shuah Khan, Linux Kernel Developer - Open Source Group Samsung Research
America (Silicon Valley) shuah.kh@samsung.com | (970) 672-0658


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