From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: kernel test robot <oliver.sang@intel.com>,
Vincent Guittot <vincent.guittot@linaro.org>
Cc: 0day robot <lkp@intel.com>, LKML <linux-kernel@vger.kernel.org>,
lkp@lists.01.org, ltp@lists.linux.it, mingo@redhat.com,
peterz@infradead.org, juri.lelli@redhat.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, bristot@redhat.com,
odin@uged.al, aubrey.li@linux.intel.com, yu.c.chen@intel.com
Subject: Re: [sched/pelt] e906550aca: WARNING:at_kernel/sched/fair.c:#update_blocked_averages
Date: Thu, 3 Jun 2021 12:50:36 +0200 [thread overview]
Message-ID: <56316b95-3ec5-74e6-a4f7-d91aea022abe@arm.com> (raw)
In-Reply-To: <20210602064526.GB9872@xsang-OptiPlex-9020>
On 02/06/2021 08:45, kernel test robot wrote:
[...]
> kern :warn : [ 40.989618] WARNING: CPU: 2 PID: 253 at kernel/sched/fair.c:8029 update_blocked_averages (kbuild/src/consumer/kernel/sched/fair.c:8029 kbuild/src/consumer/kernel/sched/fair.c:8065 kbuild/src/consumer/kernel/sched/fair.c:8152)
Hit something like this on my Ubuntu i7-7567U as well.
With more debugging:
[ 7.388006] WARNING: CPU: 1 PID: 926 at kernel/sched/fair.c:8029 update_blocked_averages+0x30d/0x7e0
...
[ 7.388167] path=/autogroup-2 load_avg=1 util_avg=0 runnable_avg=1
IMHO, this is because this patch needs:
(1) sched/pelt: ensure that *_sum is always synced with *_avg (2021-06-03 Vincent Guittot)
https://lkml.kernel.org/r/20210601085832.12626-1-vincent.guittot@linaro.org
(2) sched/fair: Keep load_avg and load_sum synced (2021-06-03 Vincent Guittot)
tip/sched/urgent 7c7ad626d9a0
Using both patches underneath makes this warning go away.
next prev parent reply other threads:[~2021-06-03 10:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 15:53 [PATCH] sched/pelt: check that *_avg are null when *_sum are Vincent Guittot
2021-06-02 6:45 ` [sched/pelt] e906550aca: WARNING:at_kernel/sched/fair.c:#update_blocked_averages kernel test robot
2021-06-03 10:50 ` Dietmar Eggemann [this message]
2021-06-03 10:59 ` Vincent Guittot
2021-06-03 10:42 ` [PATCH] sched/pelt: check that *_avg are null when *_sum are Dietmar Eggemann
2021-06-03 11:06 ` Odin Ugedal
2021-06-03 12:47 ` Vincent Guittot
2021-06-03 14:32 ` Odin Ugedal
2021-06-18 8:46 ` [tip: sched/core] sched/pelt: Check " tip-bot2 for Vincent Guittot
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