Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls
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- Subject: Re: [tip:sched/core] sched/core: Add debugging code to catch missing update_rq_clock() calls
- From: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
- Date: Mon, 30 Jan 2017 21:34:35 +0000
- Cc: fweisbec@xxxxxxxxx, tglx@xxxxxxxxxxxxx, pmladek@xxxxxxxx, hpa@xxxxxxxxx, efault@xxxxxx, sergey.senozhatsky.work@xxxxxxxxx, peterz@xxxxxxxxxxxxx, mgorman@xxxxxxxxxxxxxxxxxxx, wanpeng.li@xxxxxxxxxxx, umgwanakikbuti@xxxxxxxxx, byungchul.park@xxxxxxx, jack@xxxxxxx, mingo@xxxxxxxxxx, riel@xxxxxxxxxx, luca.abeni@xxxxxxxx, yuyang.du@xxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx, "linuxppc-dev@xxxxxxxxxxxxxxxx" <linuxppc-dev@xxxxxxxxxxxxxxxx>, "linux-next@xxxxxxxxxxxxxxx" <linux-next@xxxxxxxxxxxxxxx>
- In-reply-to: <87tw8gutp6.fsf@concordia.ellerman.id.au>
- References: <20160921133813.31976-8-matt@codeblueprint.co.uk> <tip-cb42c9a3ebbbb23448c3f9a25417fae6309b1a92@git.kernel.org> <87tw8gutp6.fsf@concordia.ellerman.id.au>
- User-agent: Mutt/1.5.24+41 (02bc14ed1569) (2015-08-30)
On Tue, 31 Jan, at 08:24:53AM, Michael Ellerman wrote:
>
> I'm hitting this on multiple powerpc systems:
>
> [ 38.339126] rq->clock_update_flags < RQCF_ACT_SKIP
> [ 38.339134] ------------[ cut here ]------------
> [ 38.339142] WARNING: CPU: 2 PID: 1 at kernel/sched/sched.h:804 detach_task_cfs_rq+0xa0c/0xd10
[...]
> I assume I should be worried?
Thanks for the report. No need to worry, the bug has existed for a
while, this patch just turns on the warning ;-)
The following commit queued up in tip/sched/core should fix your
issues (assuming you see the same callstack on all your powerpc
machines):
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=sched/core&id=1b1d62254df0fe42a711eb71948f915918987790
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