xavi/android_kernel_m2note/kernel/power, branch lp-5.1

workqueues: Introduce new flag WQ_POWER_EFFICIENT for power oriented workqueues

2016-08-26T18:21:14+00:00

Workqueues can be performance or power-oriented. Currently, most workqueues are bound to the CPU they were created on. This gives good performance (due to cache effects) at the cost of potentially waking up otherwise idle cores (Idle from scheduler's perspective. Which may or may not be physically idle) just to process some work. To save power, we can allow the work to be rescheduled on a core that is already awake. Workqueues created with the WQ_UNBOUND flag will allow some power savings. However, we don't change the default behaviour of the system. To enable power-saving behaviour, a new config option CONFIG_WQ_POWER_EFFICIENT needs to be turned on. This option can also be overridden by the workqueue.power_efficient boot parameter. tj: Updated config description and comments. Renamed CONFIG_WQ_POWER_EFFICIENT to CONFIG_WQ_POWER_EFFICIENT_DEFAULT. Signed-off-by: Viresh Kumar Reviewed-by: Amit Kucheria Signed-off-by: Tejun Heo (cherry picked from commit cee22a15052faa817e3ec8985a28154d3fabc7aa) Signed-off-by: Mark Brown Signed-off-by: Stefan Guendhoer

power: make sync on suspend optional

2016-08-26T18:20:31+00:00

propagate from (CR). On embedded devices with built-in batteries, it is not so important to sync the file systems before suspend. The chance of losing power during suspend are no greater than they are when the system is awake. The sync operations can greatly increase suspend latency when the system has accrued many dirty pages and/or the target storage devices are not particularly fast. This commit adds a kernel config option to allow file system sync in the suspend path to be disabled. It is enabled by default.

3.10.71 -> 3.10.72

2016-08-26T13:59:49+00:00

first commit

2016-08-15T02:19:42+00:00