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Added Voltage and Current regulator ftrace events to atrace 

Cherry-pick of c2c6ecd119 from AOSP

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: Ia322206ef74496daf1d9baa03545d8e89e398487
Signed-off-by: Aaron Schulman <aschulman@google.com>
This commit is contained in:
Aaron Schulman 2015-02-25 08:37:09 -08:00 committed by Chris Craik
parent 79e287890d
commit cbe13ef59b
1 changed files with 3 additions and 0 deletions
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cmds/atrace/atrace.cpp
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@ -137,6 +137,9 @@ static const TracingCategory k_categories[] = {
{ REQ, "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable" },
{ REQ, "/sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable" },
} },
{ "regulators", "Voltage and Current Regulators", 0, {
{ REQ, "/sys/kernel/debug/tracing/events/regulator/enable" },
} },
};
/* Command line options */