linux-kernel - Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

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Message-ID: <20070814203457.GB22202@one.firstfloor.org>
Date:	Tue, 14 Aug 2007 22:34:57 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Christoph Lameter <clameter@....com>,
	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

> A much simpler approach to this seems to use threaded interrupts like
> -rt does.

Then the interrupt could potentially stay blocked for very long
waiting for process context to finish its work. Also not good.
Essentially it would be equivalent to cli/sti for interrupts
that need to free memory.

-Andi
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