linux-kernel - Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAKohpo=_5RUZGQKaS2-oLqOxF2BspD0TA8PE1jbsF=CGB8umLA@mail.gmail.com>
Date:	Fri, 28 Feb 2014 14:34:42 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Kevin Hilman <khilman@...aro.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Linaro Networking <linaro-networking@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [QUERY]: Is using CPU hotplug right for isolating CPUs?

On 15 January 2014 17:04, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Jan 15, 2014 at 04:17:26PM +0530, Viresh Kumar wrote:
>> On 15 January 2014 16:08, Peter Zijlstra <peterz@...radead.org> wrote:
>> > Nah, its just ugly and we should fix it. You need to be careful to not
>> > place tasks in a cpuset you're going to unplug though, that'll give
>> > funny results.
>>
>> Okay. So how do you suggest to get rid of cases like a work queued
>> on CPU1 initially and because it gets queued again from its work handler,
>> it stays on the same CPU forever.
>
> We should have a cpuset.quiesce control or something that moves all
> timers out.

What should we do here if we have a valid base->running_timer for the
cpu requesting the quiesce ?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/