From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Zhao Chenhui <chenhui.zhao@freescale.com>
Cc: linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, leoli@freescale.com, scottwood@freescale.com,
Priyanka.Jain@freescale.com
Subject: Re: [PATCH][RFC] kernel/cpu: do not change the cpus_allowed of the current task when unplugging cpus
Date: Fri, 7 Jun 2013 11:05:43 +0200 [thread overview]
Message-ID: <20130607090543.GD10280@linutronix.de> (raw)
In-Reply-To: <1368699439-13034-1-git-send-email-chenhui.zhao@freescale.com>
* Zhao Chenhui | 2013-05-16 18:17:19 [+0800]:
>We found a problem. When a cpu is brought down using _cpu_down(),
>the corresponding cpu bit in the cpus_allowed of the current task is
>cleared. But this bit will not be set when the same cpu is online again.
>Then, the current task and its child processes will not be allowed to
>run on this cpu.
Isn't this what should happen? This also happens on mainline if you
leave the RT bits out, right? You should be able to put the task back on
the CPU once the CPU is up again.
Sebastian
next prev parent reply other threads:[~2013-06-07 9:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 10:17 [PATCH][RFC] kernel/cpu: do not change the cpus_allowed of the current task when unplugging cpus Zhao Chenhui
2013-06-07 9:05 ` Sebastian Andrzej Siewior [this message]
2013-06-09 9:59 ` Zhao Chenhui
2013-06-14 15:29 ` Sebastian Andrzej Siewior
2013-06-17 10:48 ` Zhao Chenhui
2013-06-17 11:49 ` Sebastian Andrzej Siewior
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