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

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Message-ID: <20090428110553.GD25347@elte.hu>
Date:	Tue, 28 Apr 2009 13:05:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andi Kleen <andi@...stfloor.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Fr馘駻ic Weisbecker <fweisbec@...il.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matt Mackall <mpm@...enic.com>,
	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


* Wu Fengguang <fengguang.wu@...el.com> wrote:

> > See my other mail i just sent: it would be a natural extension 
> > of tracing to also dump all current object state when tracing is 
> > turned on. That way no drop_caches is needed at all.
> 
> I can understand the merits here - I also did readahead 
> tracing/accounting in _one_ piece of code. Very handy.
> 
> The readahead traces are now raw printks - converting to the 
> ftrace framework would be a big win.
> 
> But. It's still not a fit-all solution. Imagine when full data 
> _since_ booting is required, but the user cannot afford a reboot.

The above 'get object state' interface (which allows passive 
sampling) - integrated into the tracing framework - would serve that 
goal, agreed?

	Ingo
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