From: Nigel Cunningham <ncunningham@cyclades.com>
To: vatsa@in.ibm.com
Cc: Li Shaohua <shaohua.li@intel.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>
Subject: Re: PATCH: Fix race in cpu_down (hotplug cpu)
Date: Mon, 19 Sep 2005 15:35:22 +1000 [thread overview]
Message-ID: <1127108122.9696.90.camel@localhost> (raw)
In-Reply-To: <20050919052830.GB8653@in.ibm.com>
On Mon, 2005-09-19 at 15:28, Srivatsa Vaddagiri wrote:
> On Mon, Sep 19, 2005 at 03:23:01PM +1000, Nigel Cunningham wrote:
> > Maybe I'm just an ignoramus, but I was thinking (without being a
> > scheduler expert at all) that if the idle thread was already running,
> > trying to set it up to run next might possibly have zero effect. I've
>
> sched_idle_next actually adds the idle task to its runqueue (normally
> it is not present in a runqueue while running) and as well changes its
> priority/policy. So it does have *some* effect!
Ok.
> > added a bit of debugging code to try and see in better detail what's
> > happening.
>
> Could you elaborate (with some stack traces maybe) on the deadlock you are
> seeing during resume? Maybe that can throw some light.
I'll try. I'm having trouble reproducing it now (yes, having reversed my
patch!).
Regards,
Nigel
--
next prev parent reply other threads:[~2005-09-19 5:35 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
2005-09-19 5:23 ` Nigel Cunningham
2005-09-19 5:28 ` Srivatsa Vaddagiri
2005-09-19 5:35 ` Nigel Cunningham [this message]
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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