LinuxCon+ContainerCon Europe 2016

Multiple subsystems in the Linux kernel are concerned with various aspects of energy efficiency. Some of them act on the system as a whole while the others focus on individual CPUs or IO devices. The majority of them have been developed in isolation and they work reasonably well individually, but that is often insufficient to address problems related to contemporary trends in hardware design and growing user expectations. Thus they have to be made work more closely with one another and with core kernel code like the CPU scheduler. Efforts to make that happen are under way and I will describe them. However, in the meantime the existing Linux PM infrastructure has to respond to the users' needs, so I will discuss its current status, the most important problems it is facing and some possible ways to address them.