On Mon, Jun 27, 2016 at 03:56:03PM +0800, Jisheng Zhang wrote: > This is to avoid cpufreq update callbacks when we go idle on UP > platforms.
How so? the patch only avoids calling the update for (!root) cgroups -- which makes sense, but I'm not seeing how that's related to going idle, or UP at all. > > Signed-off-by: Jisheng Zhang <jszh...@marvell.com> > --- > kernel/sched/fair.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c > index bdcbeea..236ec5b 100644 > --- a/kernel/sched/fair.c > +++ b/kernel/sched/fair.c > @@ -3121,7 +3121,8 @@ static inline void update_load_avg(struct sched_entity > *se, int not_used) > struct cfs_rq *cfs_rq = cfs_rq_of(se); > struct rq *rq = rq_of(cfs_rq); > > - cpufreq_trigger_update(rq_clock(rq)); > + if (&rq->cfs == cfs_rq) > + cpufreq_trigger_update(rq_clock(rq)); > } > > static inline void > -- > 2.8.1 >
