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

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Message-Id: <20090428190822.EBED.A69D9226@jp.fujitsu.com>
Date:	Tue, 28 Apr 2009 19:10:25 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	kosaki.motohiro@...fujitsu.com, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	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

> I guess the main question here is whether this approach will scale to
> something like kmalloc() or the page allocator in production
> environments. For any serious workload, the frequency of events is
> going to be pretty high.

Immediate Values patch series makes zero-overhead to tracepoint
while it's not used.

So, We have to implement to stop collect stastics way. it restore
zero overhead world.
We don't lose any performance by trace.



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