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PM / Sleep: Change wakeup source statistics to follow Android

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Wakeup statistics used by Android are slightly different from what we
have in wakeup sources at the moment and there aren't any known
users of those statistics other than Android, so modify them to make
it easier for Android to switch to wakeup sources.

This removes the struct wakeup_source's hit_cout field, which is very
rough and therefore not very useful, and adds two new fields,
wakeup_count and expire_count.  The first one tracks how many times
the wakeup source is activated with events_check_enabled set (which
roughly corresponds to the situations when a system power transition
to a sleep state is in progress and would be aborted by this wakeup
source if it were the only active one at that time) and the second
one is the number of times the wakeup source has been activated with
a timeout that expired.

Additionally, the last_time field is now updated when the wakeup
source is deactivated too (previously it was only updated during
the wakeup source's activation), which seems to be what Android does
with the analogous counter for wakelocks.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki
2012-04-29 22:52:52 +02:00
parent 60af106691
commit 30e3ce6dcb
4 changed files with 77 additions and 52 deletions
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24
Documentation/ABI/testing/sysfs-devices-power
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@@ -96,16 +96,26 @@ Description:
is read-only. If the device is not enabled to wake up the
system from sleep states, this attribute is not present.
What: /sys/devices/.../power/wakeup_hit_count
Date: September 2010
What: /sys/devices/.../power/wakeup_abort_count
Date: February 2012
Contact: Rafael J. Wysocki <rjw@sisk.pl>
Description:
The /sys/devices/.../wakeup_hit_count attribute contains the
The /sys/devices/.../wakeup_abort_count attribute contains the
number of times the processing of a wakeup event associated with
the device might prevent the system from entering a sleep state.
This attribute is read-only. If the device is not enabled to
wake up the system from sleep states, this attribute is not
present.
the device might have aborted system transition into a sleep
state in progress. This attribute is read-only. If the device
is not enabled to wake up the system from sleep states, this
attribute is not present.
What: /sys/devices/.../power/wakeup_expire_count
Date: February 2012
Contact: Rafael J. Wysocki <rjw@sisk.pl>
Description:
The /sys/devices/.../wakeup_expire_count attribute contains the
number of times a wakeup event associated with the device has
been reported with a timeout that expired. This attribute is
read-only. If the device is not enabled to wake up the system
from sleep states, this attribute is not present.
What: /sys/devices/.../power/wakeup_active
Date: September 2010