From: Tim Hockin <thockin@hockin.org>
To: Nick Piggin <piggin@cyberone.com.au>
Cc: Rusty Russell <rusty@au1.ibm.com>,
vatsa@in.ibm.com, lhcs-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, torvalds@osdl.org, akpm@osdl.org,
rml@tech9.net
Subject: Re: CPU Hotplug: Hotplug Script And SIGPWR
Date: Mon, 19 Jan 2004 22:52:07 -0800 [thread overview]
Message-ID: <20040120065207.GA10993@hockin.org> (raw)
In-Reply-To: <400CCE2F.2060502@cyberone.com.au>
On Tue, Jan 20, 2004 at 05:43:59PM +1100, Nick Piggin wrote:
> >I think the sanest thing for a CPU removal is to migrate everything off the
> >processor in question, move unrunnable tasks into TASK_UNRUNNABLE state,
> >then notify /sbin/hotplug. The hotplug script can then find and handle the
> >unrunnable tasks. No SIGPWR grossness needed.
> >
> >Code against 2.4 at http://www.hockin.org/~thockin/procstate - it was
> >heavily tested and I *think* it is all correct (for that kernel snapshot).
>
> Seems less robust and more ad hoc than SIGPWR, however.
Disagree. SIGPWR will kill any process that doesn't catch it. That's
policy. It seems more robust to let the hotplug script decide what to do.
If it wants to kill each unrunnable task with SIGPWR, it can. But if it
wants to let them live, it can.
Tim
next prev parent reply other threads:[~2004-01-20 6:52 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20040116174446.A2820@in.ibm.com>
2004-01-20 5:44 ` CPU Hotplug: Hotplug Script And SIGPWR Rusty Russell
2004-01-20 6:33 ` Tim Hockin
2004-01-20 6:43 ` Nick Piggin
2004-01-20 6:52 ` Tim Hockin [this message]
2004-01-20 7:11 ` Nick Piggin
2004-01-20 7:30 ` Tim Hockin
2004-01-20 7:45 ` Nick Piggin
2004-01-20 7:54 ` Tim Hockin
2004-01-20 8:14 ` Nick Piggin
2004-01-20 8:29 ` Tim Hockin
2004-01-20 8:37 ` Nick Piggin
2004-01-20 8:43 ` Tim Hockin
2004-01-21 4:06 ` Srivatsa Vaddagiri
2004-01-21 4:14 ` Nick Piggin
2004-01-21 5:09 ` Srivatsa Vaddagiri
2004-01-21 7:08 ` Tim Hockin
2004-01-21 15:07 ` Matthias Urlichs
2004-01-22 5:29 ` Rusty Russell
2004-01-21 7:09 ` Tim Hockin
2004-01-21 7:31 ` Nick Piggin
2004-01-21 7:42 ` Tim Hockin
2004-01-21 8:11 ` Rusty Russell
2004-01-21 5:07 ` Rusty Russell
2004-01-20 8:41 ` Stefan Smietanowski
2004-01-20 8:49 ` Nick Piggin
2004-01-20 9:12 ` Tim Hockin
2004-01-21 0:00 ` Rusty Russell
2004-01-20 23:51 ` Rusty Russell
2004-01-20 7:45 ` Rusty Russell
2004-01-20 8:37 ` Tim Hockin
2004-01-20 9:29 ` Srivatsa Vaddagiri
2004-01-21 0:12 ` Rusty Russell
[not found] <fa.f37o48p.1io5q5@ifi.uio.no>
[not found] ` <fa.frjqvfo.170g8hq@ifi.uio.no>
2004-01-20 17:49 ` Andy Lutomirski
2004-01-21 4:33 ` Rusty Russell
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