linux-kernel - Re: Random abnormal high CPU sys usage related to timer

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Message-ID: <CAOMGZ=F4eEWT1bceEiZ11p=mbfj6DPmf2eht_SK=G_9LiehTew@mail.gmail.com>
Date:   Fri, 26 Aug 2016 23:12:10 +0200
From:   Vegard Nossum <vegard.nossum@...il.com>
To:     Mac Lin <mkl0301@...il.com>
Cc:     John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Random abnormal high CPU sys usage related to timer

On 26 August 2016 at 19:10, Mac Lin <mkl0301@...il.com> wrote:
> We were having issue with our userspace application which
> __sometimes__ result in high CPU sys usage at each execution. The high
> sys CPU usage persist until the application is killed.
[...]
> Googling found one issue that seems related, but no further action.

Was it this one? https://lkml.org/lkml/2016/8/23/360

If so you may try to revert commit ff9a9b4c4334 ("sched, time: Switch
VIRT_CPU_ACCOUNTING_GEN to jiffy granularity") to see if it helps.


Vegard