Re: [RFC PATCH 1/2] sched: Clean up SD_BALANCE_WAKE flags in sched domain build-up

[Mike Galbraith]

On Tue, 2016-05-31 at 09:31 +0800, Yuyang Du wrote:
> On Tue, May 31, 2016 at 11:21:46AM +0200, Peter Zijlstra wrote:
> > On Tue, May 31, 2016 at 09:11:37AM +0800, Yuyang Du wrote:
> > > The SD_BALANCE_WAKE is irrelevant in the contexts of these two removals,
> > > and in addition SD_BALANCE_WAKE is not and should not be set in any
> > > sched_domain flags so far.
> > 
> > This Changelog doesn't make any sense...
> 
> How? SD_BALANCE_WAKE is not in any sched_domain flags (sd->flags), even if
> it is, it is not used anywhere, no?

If the user chooses to set SD_BALANCE_WAKE in sd->flags, it is in fact
used.  It's just not turned on by default due to full balance on every
wakeup being far too painful to do by default.

	-Mike