linux-kernel - Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address ranges

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Message-ID: <20080229005530.GO8091@v2.random>
Date:	Fri, 29 Feb 2008 01:55:30 +0100
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, akpm@...ux-foundation.org,
	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 2/6] mmu_notifier: Callbacks to invalidate address
	ranges

On Thu, Feb 28, 2008 at 10:43:54AM -0800, Christoph Lameter wrote:
> What about invalidate_page()?

That would just spin waiting an ack (just like the smp-tlb-flushing
invalidates in numa already does).

Thinking more about this, we could also parallelize it with an
invalidate_page_before/end. If it takes 1usec to flush remotely,
scheduling would be overkill, but spending 1usec in a while loop isn't
nice if we can parallelize that 1usec with the ipi-tlb-flush. Not sure
if it makes sense... it certainly would be quick to add it (especially
thanks to _notify ;).
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