linux-kernel - Re: [PATCH 5/5] proc: export more page flags in /proc/kpageflags

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Date:	Tue, 28 Apr 2009 15:59:53 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Tony Luck <tony.luck@...il.com>
Cc:	Wu Fengguang <fengguang.wu@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 5/5] proc: export more page flags in /proc/kpageflags

On Tue, 2009-04-28 at 13:47 -0700, Tony Luck wrote:
> On Tue, Apr 28, 2009 at 11:34 AM, Matt Mackall <mpm@...enic.com> wrote:
> > Bah. The rate of change is proportional to #cpus, not #pages. Assuming
> > you've got 1024 processors, you could run the scan in parallel in .2
> > seconds still.
> 
> That would help ... it would also make the patch to support this
> functionality a lot more complex.

The kernel bits should handle this already today. You just need 1k
userspace threads to open /proc/kpageflags, seek() appropriately, and
read().

-- 
http://selenic.com : development and support for Mercurial and Linux


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