From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: Shaohua Li <shaohua.li@intel.com>
Cc: Nigel Cunningham <ncunningham@cyclades.com>,
Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: PATCH: Fix race in cpu_down (hotplug cpu)
Date: Mon, 19 Sep 2005 12:37:24 +0530 [thread overview]
Message-ID: <20050919070724.GA9937@in.ibm.com> (raw)
In-Reply-To: <1127111830.4087.3.camel@linux-hp.sh.intel.com>
On Mon, Sep 19, 2005 at 02:37:09PM +0800, Shaohua Li wrote:
> > - if (need_resched())
> > + if (need_resched() || cpu_is_offline(cpu))
> > break;
> if the breakpoint is here, you will still have trouble.
[snip]
> Why default_idle should be fine? it can be preempted before the
> 'local_irq_disable' check.
> Even with Nigel's patch, there is a very
> small window at safe_halt (after 'sti' but before 'hlt').
Good point. Sounds like the patch that Nick has for disabling premption
while it is idle may be a cure for these problems.
--
Thanks and Regards,
Srivatsa Vaddagiri,
Linux Technology Center,
IBM Software Labs,
Bangalore, INDIA - 560017
next prev parent reply other threads:[~2005-09-19 7:08 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-19 4:48 PATCH: Fix race in cpu_down (hotplug cpu) Li, Shaohua
2005-09-19 5:10 ` Srivatsa Vaddagiri
2005-09-19 5:31 ` Shaohua Li
2005-09-19 5:57 ` Srivatsa Vaddagiri
2005-09-19 6:11 ` Nigel Cunningham
2005-09-19 6:23 ` Srivatsa Vaddagiri
2005-09-19 6:29 ` Nick Piggin
2005-09-19 7:00 ` Srivatsa Vaddagiri
2005-09-19 6:31 ` Nigel Cunningham
2005-09-19 7:09 ` Srivatsa Vaddagiri
2005-09-19 6:37 ` Shaohua Li
2005-09-19 6:36 ` Nick Piggin
2005-09-19 6:54 ` Nigel Cunningham
2005-09-19 7:12 ` Shaohua Li
2005-09-19 7:22 ` Nick Piggin
2005-09-19 7:28 ` Ingo Molnar
2005-09-19 7:37 ` Nick Piggin
2005-09-19 22:55 ` Nigel Cunningham
2005-09-20 4:41 ` Srivatsa Vaddagiri
2005-09-19 7:07 ` Srivatsa Vaddagiri [this message]
2005-09-19 5:23 ` Nigel Cunningham
2005-09-19 5:28 ` Srivatsa Vaddagiri
2005-09-19 5:35 ` Nigel Cunningham
2005-09-19 7:43 ` Where do packets sent to 255.255.255.255 go? Wei-Che, Hsu
-- strict thread matches above, loose matches on Subject: below --
2005-09-19 3:28 PATCH: Fix race in cpu_down (hotplug cpu) Nigel Cunningham
2005-09-19 4:22 ` Srivatsa Vaddagiri
2005-09-19 3:15 Nigel Cunningham
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