linux-kernel - Re: [PATCH] Relay CPU Hotplug support

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Message-Id: <20061222024458.322adffd.akpm@osdl.org>
Date:	Fri, 22 Dec 2006 02:44:58 -0800
From:	Andrew Morton <akpm@...l.org>
To:	ego@...ibm.com, Oleg Nesterov <oleg@...sign.ru>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, David Wilder <dwilder@...ibm.com>,
	Tom Zanussi <zanussi@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Christoph Hellwig <hch@...radead.org>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com,
	Douglas Niehaus <niehaus@...s.ku.edu>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Thomas Gleixner <tglx@...utronix.de>, kiran@...lex86.org,
	venkatesh.pallipadi@...el.com, dipankar@...ibm.com,
	vatsa@...ibm.com, torvalds@...l.org, davej@...hat.com
Subject: Re: [PATCH] Relay CPU Hotplug support

On Fri, 22 Dec 2006 16:07:24 +0530
Gautham R Shenoy <ego@...ibm.com> wrote:

> While we are at this per-subsystem cpuhotplug "locking", here's a
> proposal that might put an end to the workqueue deadlock woes.

Oleg is working on some patches which will permit us to cancel or wait upon
a particular work_struct, rather than upon all pending work_structs.  

This will fix the problem where we accidentlly wait upon some unrelated
work_struct which takes a lock which is related to one which we already
hold.

I hope.  It'll be a bit tricky to implement: if some foreign work_struct is
running right now, we cannot wait upon it - we must non-blockingly dequeue
the work_struct which we want to kill before it gets to run.


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