From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Francis Giraldeau <francis.giraldeau@gmail.com>
Cc: "linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>
Subject: Re: Timer tick not disabled with NO_HZ_FULL
Date: Wed, 3 Aug 2016 09:40:56 +0200 [thread overview]
Message-ID: <20160803074056.GA6741@linutronix.de> (raw)
In-Reply-To: <CAC6yHM4kTvXiJwsyFqmi3p_4U8a54wwUJz9QFHAGsO+aM6G6Wg@mail.gmail.com>
* Francis Giraldeau | 2016-07-29 16:56:15 [-0400]:
>It seems that the timer tick occurs with a PREEMPT_RT kernel even if configured
>with NO_HZ_FULL. On a real-time system where some cores are configured with
correct.
…
>This commit is quite old, maybe a solution exists to the problem of base timer
>locking. Would it be possible for instance to use RCU instead here to support
>NO_HZ_FULL with a PREEMPT_RT kernel?
Unfortunately RCU can't fix everything in its own magical way. But there
is hope! Since v4.6.4-rt8 we have NO_HZ_FULL working thanks to the timer
wheel rework.
>Thanks,
>
>Francis
Sebastian
next prev parent reply other threads:[~2016-08-03 7:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-29 20:56 Timer tick not disabled with NO_HZ_FULL Francis Giraldeau
2016-08-03 7:40 ` Sebastian Andrzej Siewior [this message]
[not found] ` <DDCAE26804250545B9934A2056554AA021106A54@ORSMSX112.amr.corp.intel.com>
2016-08-05 0:36 ` The timer softirq on the RT kernel yunhong jiang
2016-08-05 2:36 ` Mike Galbraith
2016-08-05 20:17 ` yunhong jiang
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