On Tue, Jan 12, 2021 at 4:02 PM Peter Zijlstra <[email protected]> wrote: > > On Fri, Jan 08, 2021 at 07:05:59PM +0100, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki <[email protected]> > > > > On x86 scale invariace tends to be disabled during resume from > > suspend-to-RAM, because the MPERF or APERF MSR values are not as > > expected then due to updates taking place after the platform > > firmware has been invoked to complete the suspend transition. > > > > That, of course, is not desirable, especially if the schedutil > > scaling governor is in use, because the lack of scale invariance > > causes it to be less reliable. > > > > To counter that effect, modify init_freq_invariance() to register > > a syscore_ops object for scale invariance with the ->resume callback > > pointing to init_counter_refs() which will run on the CPU starting > > the resume transition (the other CPUs will be taken care of the > > "online" operations taking place later). > > > > Fixes: e2b0d619b400 ("x86, sched: check for counters overflow in frequency > > invariant accounting") > > Signed-off-by: Rafael J. Wysocki <[email protected]> > > Thanks!, I'll take it through the sched/urgent tree?
That works, thanks!
