linux-kernel - Re: [PATCH 2/4] stop_machine: reimplement using cpuhog

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

Message-ID: <4B958673.3000105@kernel.org>
Date:	Tue, 09 Mar 2010 08:21:23 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	sivanich@....com, heiko.carstens@...ibm.com,
	torvalds@...ux-foundation.org, mingo@...e.hu, peterz@...radead.org,
	dipankar@...ibm.com, josh@...edesktop.org,
	paulmck@...ux.vnet.ibm.com, oleg@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 2/4] stop_machine: reimplement using cpuhog

Hello,

On 03/09/2010 01:32 AM, Arjan van de Ven wrote:
> On Tue,  9 Mar 2010 00:53:21 +0900
> Tejun Heo <tj@...nel.org> wrote:
> 
>> Reimplement stop_machine using cpuhog.  As cpuhogs are guaranteed to
>> be available for all online cpus, stop_machine_create/destroy() are no
>> longer necessary and removed.
> 
> question;
> stop_machine pretty much also stops interrupts (it has to, at least for
> the users of stop_machine).. do cpu_hogs do this too?
> 
> (if they don't, cpu_hogs aren't safe for some of the users of
> stop_machine, like code patching etc)

That is and has always been done by stop_machine cpuhog callback
stop_cpu().  Only the thread pool is changed.  The logic stays the
same.

Thanks.

-- 
tejun
--
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/