linux-kernel - Re: [13/17] Virtual compound page freeing in interrupt context

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Date:	Thu, 20 Sep 2007 10:50:21 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Christoph Hellwig <hch@....de>, Mel Gorman <mel@...net.ie>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Chinner <dgc@....com>, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [13/17] Virtual compound page freeing in interrupt context

On Wed, 19 Sep 2007, Nick Piggin wrote:

> > Removing a virtual mappping *must* be done with interrupts enabled
> > since tlb_xx functions are called that rely on interrupts for
> > processor to processor communications.
> 
> These things will clash drastically with my lazy TLB flushing and scalability
> work. Actually the lazy TLB flushing will provide a natural way to defer
> unmapping at interrupt time, and the scalability work should make it
> easier to vmap from interrupt context too, if you really need that.

Both would be good to have.

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