From: Sasha Levin <sashal@kernel.org>
To: Vishnu Rangayyan <vishnu.rangayyan@apple.com>
Cc: stable@vger.kernel.org, gregkh@linuxfoundation.org,
Andrew Forgue <andrewf@apple.com>,
vincent.guittot@linaro.org, peterz@infradead.org,
dietmar.eggemann@arm.com, rafael.j.wysocki@intel.com
Subject: Re: Fixes for 4.19 stable
Date: Sat, 29 Feb 2020 22:11:28 -0500 [thread overview]
Message-ID: <20200301031128.GK21491@sasha-vm> (raw)
In-Reply-To: <6CF798B4-B68B-4729-A496-2152FC032ABC@apple.com>
On Fri, Feb 28, 2020 at 12:13:54PM -0800, Vishnu Rangayyan wrote:
>Hi,
>
>I still see high (upto 30%) ksoftirqd cpu use with 4.19.101+ after these 2 back ports went in for 4.19.101
>(had all 4 backports applied earlier to our tree):
>
>commit f6783319737f28e4436a69611853a5a098cbe974 sched/fair: Fix insertion in rq->leaf_cfs_rq_list
>commit 5d299eabea5a251fbf66e8277704b874bbba92dc sched/fair: Add tmp_alone_branch assertion
>
>perf shows for any given ksoftirqd, with 20k-30k processes on the system with high scheduler load:
> 58.88% ksoftirqd/0 [kernel.kallsyms] [k] update_blocked_averages
>
>Can we backport these 2 also, confirmed that it fixes this behavior of ksoftirqd.
>
>commit 039ae8bcf7a5f4476f4487e6bf816885fb3fb617 upstream
>commit 31bc6aeaab1d1de8959b67edbed5c7a4b3cdbe7c upstream
Do we also need bef69dd87828 ("sched/cpufreq: Move the
cfs_rq_util_change() call to cpufreq_update_util()") then?
--
Thanks,
Sasha
next prev parent reply other threads:[~2020-03-01 3:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 20:13 Fixes for 4.19 stable Vishnu Rangayyan
2020-03-01 3:11 ` Sasha Levin [this message]
2020-03-02 23:13 ` Vishnu Rangayyan
2020-03-03 8:03 ` Vincent Guittot
2020-03-03 15:43 ` gregkh
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