From: Rusty Russell <rusty@rustcorp.com.au>
To: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Nathan Lynch <nathanl@austin.ibm.com>,
Joel Schopp <jschopp@austin.ibm.com>,
Ashok Raj <ashok.raj@intel.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Gautham R Shenoy <ego@in.ibm.com>
Subject: Re: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes
Date: Tue, 08 May 2007 13:02:25 +1000 [thread overview]
Message-ID: <1178593345.28438.29.camel@localhost.localdomain> (raw)
In-Reply-To: <877irkrq8a.wl%takeuchi_satoru@jp.fujitsu.com>
On Tue, 2007-05-08 at 11:41 +0900, Satoru Takeuchi wrote:
> At Mon, 07 May 2007 23:42:53 +1000,
> Rusty Russell wrote:
> > I look forward to your patch!
> > Rusty.
>
> Thanks, I'll do. Maybe this work will take several days including test.
Excellent.
> BTW, how should I manage rt process having max priority as Gautham said?
> He said that it's OK unless such kernel thread exists. However, currently
> MAX_USER_RT_PRIORITY is equal to MAX_RT_PRIO, so user process also be able
> to cause this problem. Is Srivatsa's idea 2 acceptable? Or just apply
> "Shouldn't abuse highest rt proority" rule?
We used to be able to create kernel threads higher than any userspace
priority. If this is no longer true, I think that's OK: equal priority
still means we'll get scheduled, right?
Cheers,
Rusty.
next prev parent reply other threads:[~2007-05-08 3:08 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-07 10:10 [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes Satoru Takeuchi
2007-05-07 10:47 ` Gautham R Shenoy
2007-05-07 11:02 ` Srivatsa Vaddagiri
2007-05-07 12:39 ` Gautham R Shenoy
2007-05-07 10:55 ` Srivatsa Vaddagiri
2007-05-07 10:56 ` KAMEZAWA Hiroyuki
2007-05-07 13:42 ` Rusty Russell
2007-05-08 2:41 ` Satoru Takeuchi
2007-05-08 3:02 ` Rusty Russell [this message]
2007-05-08 3:29 ` Satoru Takeuchi
2007-05-08 4:04 ` Rusty Russell
2007-05-08 4:10 ` Srivatsa Vaddagiri
2007-05-08 7:16 ` Satoru Takeuchi
2007-05-08 16:48 ` Srivatsa Vaddagiri
2007-05-09 0:40 ` Satoru Takeuchi
2007-05-09 0:47 ` Nick Piggin
2007-05-09 6:31 ` Satoru Takeuchi
2007-05-09 8:56 ` Gautham R Shenoy
2007-05-11 8:49 ` [PATCH 1/2] Fix stop_machine_run problem with naughty real time process Satoru Takeuchi
2007-05-11 9:18 ` Satoru Takeuchi
2007-05-11 8:49 ` [PATCH 2/2] cpu hotplug: fix ksoftirqd termination on cpu hotplug with naughty realtime process Satoru Takeuchi
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