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authorTodd E Brandt <todd.e.brandt@linux.intel.com>2014-06-10 07:31:22 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-06-11 02:16:48 +0200
commite8bca479c3f269ebb3a3acea5ef63314bb677060 (patch)
tree9c0663c4fe0150ebdd8f45084885ca23214e63ce /Documentation
parentbb3632c6101b2fad07e6246721466b984b1e0e9d (diff)
PM / sleep: trace events for device PM callbacks
Adds two trace events which supply the same info that initcall_debug provides, but via ftrace instead of dmesg. The existing initcall_debug calls require the pm_print_times_enabled var to be set (either via sysfs or via the kernel cmd line). The new trace events provide all the same info as the initcall_debug prints but with less overhead, and also with coverage of device prepare and complete device callbacks. These events replace the device_pm_report_time event (which has been removed). device_pm_callback_start is called first and provides the device and callback info. device_pm_callback_end is called after with the device name and error info. The time and pid are gathered from the trace data headers. Signed-off-by: Todd Brandt <todd.e.brandt@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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