linux-kernel - Re: [RFC][PATCH] kmap_atomic

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Message-ID: <4ACF296E.3000000@hp.com>
Date:	Fri, 09 Oct 2009 08:15:42 -0400
From:	jim owens <jowens@...com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC][PATCH] kmap_atomic_push

Peter Zijlstra wrote:
> 
> The double unmap gives a preemption point, which sounds like a good
> thing to have, because your scheme could run for a long while without
> enabling preemption, which is badness.

Thanks, optimizing my loop, I forgot all about
the old long code path not preempting problem.

Now I have to love the patch for making it harder to be stupid :)
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