tree d65fd61d179c5643ce21bae0271ac77667981219
parent d80268ba19f9217c5459a2952580090ef84a7b78
author Aaron Schulman <aschulman@google.com> 1424882229 -0800
committer Aaron Schulman <aschulman@google.com> 1424886623 +0000

Added Voltage and Current regulator ftrace events to atrace

Tracing the state of the voltage and current regulators enables a developer
to attribute power consumption measurements to specific perhipherals and
cores. Unlike other indirect methods of tracing when peripherals and cores
are toggled, the regulator ftrace event indicates the exact point in time
when the kernel switches on or off the device. For example, in the following
trace, a developer can see exactly when the krait2 core starts receiving
power, and and when the voltage is set for voltage scaling.

mpdecision-2172  [000] ...1  1566.665481: regulator_enable: name=krait2
mpdecision-2172  [000] ...1  1566.665493: regulator_enable_delay: name=krait2
mpdecision-2172  [000] ...1  1566.665495: regulator_enable_complete: name=krait2
<...>-4133  [002] ...1  1566.666891: regulator_set_voltage: name=krait2 (1075000-1100000)

Change-Id: I964d50be89bbfc554d2ab3e32a18514d1b1e70f4
Signed-off-by: Aaron Schulman <aschulman@google.com>