linux-kernel - Re: [PATCH 1/7] tracing, mm: Record pfn instead of pointer to struct page

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Message-ID: <20150327121306.32ad44c1@gandalf.local.home>
Date:	Fri, 27 Mar 2015 12:13:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <js1304@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH 1/7] tracing, mm: Record pfn instead of pointer to
 struct page

On Fri, 27 Mar 2015 11:08:01 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> The struct page is opaque for userspace tools, so it'd be better to save
> pfn in order to identify page frames.
> 
> The textual output of $debugfs/tracing/trace file remains unchanged and
> only raw (binary) data format is changed - but thanks to libtraceevent,
> userspace tools which deal with the raw data (like perf and trace-cmd)
> can parse the format easily.  So impact on the userspace will also be
> minimal.
> 
> Based-on-patch-by: Joonsoo Kim <js1304@...il.com>
> Acked-by: Ingo Molnar <mingo@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: linux-mm@...ck.org
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---


Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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