linux-kernel - Re: highres timers break cpu hotplug in 2.6.23-rc5 [was Re: cpu hotplug support broken in 2.6.23-rc3]

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Message-ID: <b6a2187b0709030534t6589772ahb1f8e45490a7b00d@mail.gmail.com>
Date:	Mon, 3 Sep 2007 20:34:09 +0800
From:	"Jeff Chua" <jeff.chua.linux@...il.com>
To:	"Pavel Machek" <pavel@....cz>
Cc:	rusty@...tycorp.com.au, vatsa@...ibm.com, zwane@....linux.org.uk,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, tglx@...utronix.de
Subject: Re: highres timers break cpu hotplug in 2.6.23-rc5 [was Re: cpu hotplug support broken in 2.6.23-rc3]

On 9/3/07, Pavel Machek <pavel@....cz> wrote:

> It gets weirder. With "nohz=off" on commandline, I have to press any
> key (generate interrupt?) for echo 1  > online to finish. 2.6.23-rc5
> kernel... but hotplug/unplug works reliably now.
>
> With nohz=off highres=off I can unplug/replug cpus as much as I
> want... running in tight loop now.

Yes. CONFIG_NO_HZ and and CONFIG_HIGH_RES_TIMERS has to be unset or
suspend-to-disk would just hang, unless you type something on the
keyboard, and then you can suspend to disk. It seems interrupts are
not missing.

Thanks,
Jeff.
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