Re: [RFC PATCH 2/2] sched: Remove SD_WAKE_AFFINE flag and replace it with SD_BALANCE_WAKE

[Yuyang Du]

On Tue, May 31, 2016 at 11:23:14AM +0200, Peter Zijlstra wrote:
> On Tue, May 31, 2016 at 09:11:38AM +0800, Yuyang Du wrote:
> > SD_BALANCE_{FORK|EXEC|WAKE} flags are for select_task_rq() to select a
> > CPU to run a new task or a waking task. SD_WAKE_AFFINE is a flag to
> > try selecting the waker CPU to run the waking task.
> > 
> > SD_BALANCE_WAKE is not a sched_domain flag, but SD_WAKE_AFFINE is.
> 
> No, SD_BALANCE_{FORK,EXEC,WAKE} are very much sched_domain flags.
> 
> They indicate how wide we should look to place tasks on these events.

With this patch, they are, and in particular SD_BALANCE_WAKE is.

SD_WAKE_AFFINE is just a particular CPU candidate in SD_BALANCE_WAKE.