Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls
From: Mike Galbraith <hidden>
Date: 2017-02-03 13:00:17
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On Fri, 2017-02-03 at 09:53 +0100, Peter Zijlstra wrote:
On Fri, Feb 03, 2017 at 10:03:14AM +0530, Sachin Sant wrote:
quoted
I ran few cycles of cpu hot(un)plug tests. In most cases it works except one where I ran into rcu stall: [ 173.493453] INFO: rcu_sched detected stalls on CPUs/tasks: [ 173.493473] > > > > 8-...: (2 GPs behind) idle=006/140000000000000/0 softirq=0/0 fqs=2996 [ 173.493476] > > > > (detected by 0, t=6002 jiffies, g=885, c=884, q=6350)Right, I actually saw that too, but I don't think that would be related to my patch. I'll see if I can dig into this though, ought to get fixed regardless.
FWIW, I'm not seeing stalls/hangs while beating hotplug up in tip. (so next grew a wart?) -Mike