From: Rusty Russell <rusty@rustcorp.com.au>
To: Ingo Molnar <mingo@elte.hu>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
Nick Piggin <piggin@cyberone.com.au>,
dipankar@in.ibm.com
Subject: Re: [PATCH 3/4] 2.6.2-rc2-mm2 CPU Hotplug: The Core
Date: Tue, 03 Feb 2004 11:45:22 +1100 [thread overview]
Message-ID: <20040203010224.2A2F52C0CB@lists.samba.org> (raw)
In-Reply-To: Your message of "Mon, 02 Feb 2004 16:40:40 BST." <20040202154040.GA5895@elte.hu>
In message <20040202154040.GA5895@elte.hu> you write:
> user-space tasks that rely on running on a specific CPU need a callback
> too. (probably in the form of a signal, which, if unhandled, terminates
> the task.) Eg. if a webserver has a mode to run one thread per CPU, then
> the server needs to adapt to the new situation when a CPU goes away. We
> cannot just unilaterally migrate a task and violate its affinity.
Well, that's what we'd do anyway, to deliver the signal.
This terminating signal idea is simply flawed: affinity is inherited,
so you're killing a process which knows nothing anyway.
If we can't do it well, leave it to userspace to sort out 8)
> another thing: if the migrate-irqs op is done atomically too (together
> with the migrate-tasks op) then the special-cases in idle_balance() and
> rebalance_tick() could go away too.
Exactly. It simplifies a number of things.
Thanks,
Rusty.
--
Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
next prev parent reply other threads:[~2004-02-03 1:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-31 14:16 [PATCH 3/4] 2.6.2-rc2-mm2 CPU Hotplug: The Core Rusty Russell
2004-02-01 8:03 ` Andrew Morton
2004-02-01 10:19 ` Nick Piggin
2004-02-01 12:07 ` Rusty Russell
2004-02-02 9:12 ` Ingo Molnar
2004-02-02 10:55 ` Rusty Russell
2004-02-02 12:45 ` Ingo Molnar
2004-02-02 13:22 ` Srivatsa Vaddagiri
2004-02-02 15:40 ` Ingo Molnar
2004-02-03 0:45 ` Rusty Russell [this message]
2004-02-03 8:04 ` Ingo Molnar
2004-02-03 8:16 ` Rusty Russell
2004-02-03 8:31 ` Ingo Molnar
2004-02-03 7:39 ` New v. v. experimental HOTPLUG CPU megapatch Rusty Russell
2004-02-03 9:35 ` Ingo Molnar
2004-02-05 18:12 ` Pavel Machek
2004-02-03 0:34 ` [PATCH 3/4] 2.6.2-rc2-mm2 CPU Hotplug: The Core Rusty Russell
2004-02-03 9:26 ` Ingo Molnar
2004-02-04 0:19 ` Rusty Russell
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