linux-kernel - Re: [ofa-general] Re: [GIT PULL] please pull ummunotify

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Message-ID: <20091013040515.GI18578@obsidianresearch.com>
Date:	Mon, 12 Oct 2009 22:05:15 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pavel Machek <pavel@....cz>, Roland Dreier <rdreier@...co.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, Jeff Squyres <jsquyres@...co.com>
Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify

On Mon, Oct 12, 2009 at 10:20:46PM +0200, Ingo Molnar wrote:
> It might be more acceptable because the flag-hint mechanism can at most 
> cause over-flushing - while with perf events we might miss to invalidate 
> a range altogether.

Right. Overflushing is not important, but missing an event entirely is not
recoverable (at least within the current kernel APIs).

Jason
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