On Mon, Nov 23, 2015 at 07:07:06PM +0100, Peter Zijlstra wrote: > On Mon, Nov 23, 2015 at 05:56:44PM +0000, Javi Merino wrote: > > I've tested this series on Juno (2xCortex-A57 4xCortex-A53). If you > > idle inject for 50% of the time, when I run 6 busy loops the scheduler > > sometimes keeps two of them in the same cpu while the another cpu is > > completely idle. Without idle injection the scheduler does the > > sensible thing: put one busy loop in each CPU. I'm running systemd > > and this only happens with CONFIG_SCHED_AUTOGROUP=y. If I unset > > CONFIG_SCHED_AUTOGROUP, the tasks are spread across all cpus as usual. > > That's not a plus for this patch though; but a bug report against > AUTOGROUP/cgroup muck, right?
The bug only happens when you apply this series and you set the system to idle inject 50% of the time. SCHED_AUTOGROUP is already part of the kernel and behaves properly with the kernel as is. I think that this patch should not introduce new bugs. Cheers, Javi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
