Re: [PATCH] sched: use rq_lock/unlock in online_fair_sched_group
From: Phil Auld
Date: Tue Aug 06 2019 - 09:59:04 EST
On Tue, Aug 06, 2019 at 03:03:34PM +0200 Peter Zijlstra wrote:
> On Thu, Aug 01, 2019 at 09:37:49AM -0400, Phil Auld wrote:
> > Enabling WARN_DOUBLE_CLOCK in /sys/kernel/debug/sched_features causes
> ISTR there were more issues; but it sure is good to start picking them
I haven't hit any others but if/when I'll try to dig into them.
> > warning to fire in update_rq_clock. This seems to be caused by onlining
> > a new fair sched group not using the rq lock wrappers.
> > [472978.683085] rq->clock_update_flags & RQCF_UPDATED
> > [472978.683100] WARNING: CPU: 5 PID: 54385 at kernel/sched/core.c:210 update_rq_clock+0xec/0x150
> > Using the wrappers in online_fair_sched_group instead of the raw locking
> > removes this warning.
> Yeah, that seems sane. Thanks!