linux-kernel - Re: + work_on_cpu-rewrite-it-to-create-a-kernel-thread-on-demand.patch added to -mm tree

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Date:	Thu, 12 Feb 2009 14:23:14 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	fweisbec@...il.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	oleg@...hat.com, travis@....com, a.p.zijlstra@...llo.nl,
	rusty@...tcorp.com.au
Subject: Re: +
 work_on_cpu-rewrite-it-to-create-a-kernel-thread-on-demand.patch  added to
 -mm tree

On Thu, 12 Feb 2009 14:13:06 -0800
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> 
> I should follow up and say that the reason I care right now, is I am
> digging into pci hotplug.  One of the issues I'm fighting is that
> currently I appear to need a dedicated kernel thread for each pci
> hotplug slot.  It gets easy to deadlock the kernel hotplugging
> a hotplug controller otherwise.
> 

um, ok, if you say so...

I'd have thought that a short-lived kernel thread would be appropriate,
if poss.  Physical hotplug of a PCI device isn't a high-frequency
operation.

The new-fangled work_on_cpu() could do that, or maybe the new-fangled
kernel/async.c code.

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