linux-kernel - Re: [PATCH 4/4] maps: /proc/<pid>/pmaps interface

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Message-ID: <20070817035641.GK30556@waste.org>
Date:	Thu, 16 Aug 2007 22:56:41 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
Cc:	Andrew Morton <akpm@...l.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	David Rientjes <rientjes@...gle.com>,
	John Berthels <jjberthels@...il.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] maps: /proc/<pid>/pmaps interface - memory maps in granularity of pages

On Fri, Aug 17, 2007 at 11:44:37AM +0800, Fengguang Wu wrote:
> > I'm so-so on this. 
> 
> Not that way! It's a good thing that people have different experiences
> and hence viewpoints. Maybe the concept of PFN sharing are
> straightforward to you, while I have been playing with seq_file a lot.
> 
> > On the downside:
> > 
> > - requires lots of parsing
> > - isn't random-access
> > - probably significantly slower than pagemap
> 
> That could be true.  Maybe some user with huge datasets will give us
> some idea about the performance. I don't know, maybe it's application
> dependent.
> 
> Anyway I don't think it's fair to merge a binary interface without the
> challenge from a textual one ;)

Yes, that's why I didn't say I hated it.

-- 
Mathematics is the supreme nostalgia of our time.
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