On Thu, Feb 02, 2017 at 04:52:29PM -0500, Tejun Heo wrote: > > Why do you need to manually turn it on? That is, couldn't it be > > automatic based on what controllers are enabled? > > This came up already but it's not like some controllers are inherently > thread-only. Consider CPU, all in-context CPU cycle consumptions are > tied to the thread; however, we also want to be able to account for > CPU cycles consumed for, for example, memory reclaim or encryption > during writeback. > > I played with an interface where thread mode is enabled automatically > upto the common ancestor of the threads but not only was it > complicated to implement but also the eventual behavior was very > confusing as the resource domain can change without any active actions > from the user. I think keeping things simple is the right choice > here.
Note that the explicit marking of the resource domains gets you exactly that. But let me reply in the other subthread.
