linux-kernel - Re: [RFC PATCH -tip 2/5] tracing/mm: add header event for object collections

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Date:	Fri, 29 Jul 2011 10:55:04 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Keiichi KII <k-keiichi@...jp.nec.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Tom Zanussi <tzanussi@...il.com>,
	"riel@...hat.com" <riel@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	"BA, Moussa" <Moussa.BA@...onyx.com>
Subject: Re: [RFC PATCH -tip 2/5] tracing/mm: add header event for object
 collections

On Mon, Jul 18, 2011 at 05:34:45PM -0400, Keiichi KII wrote:
> From: Keiichi Kii <k-keiichi@...jp.nec.com>
> 
> We can use this "dump_header" event to separate trace data
> for the object collections.
> 

dump_header is a very generic name. A "header" could apply to almost
anything. Network packets have headers but is unrelated to this.

> Usage and Sample output:
> 
> zsh  2815 [001]  8819.880776: dump_header: object=mm/pages/walk-fs input=/
> zsh  2815 [001]  8819.880786: dump_inode: ino=139161 size=507416 cached=507904 age=29 dirty=7 dev=254:0 file=strchr
> zsh  2815 [001]  8819.880790: dump_pagecache_range: index=0 len=1 flags=4000000000000878 count=2 mapcount=0
> zsh  2815 [001]  8819.880793: dump_pagecache_range: index=1 len=18 flags=400000000000087c count=2 mapcount=0
> zsh  2815 [001]  8819.880795: dump_pagecache_range: index=19 len=1 flags=400000000000083c count=2 mapcount=0
> zsh  2815 [001]  8819.880796: dump_pagecache_range: index=20 len=2 flags=400000000000087c count=2 mapcount=0
> ...
> zsh  2816 [001]  8820.XXXXXX: dump_header: object=mm/pages/walk-fs input=/

Is it possible for other trace information to appear in the middle of
this? In particular, is it possible for a new "dump_header" to appear in
the middle of an existing dump?

> Signed-off-by: Keiichi Kii <k-keiichi@...jp.nec.com>
> ---
> 
>  include/trace/events/mm.h |   19 +++++++++++++++++++
>  kernel/trace/trace_mm.c   |    9 +++++++++
>  2 files changed, 28 insertions(+), 0 deletions(-)
> 

Where are these files? Your leader makes reference to latest linux-tip
but there are a few trees called linux-tip. Even then, which latest
branch? I dug through Ingo's linux-tip tree but couldn't find where the
dump_inode tracepoint was to look at it so I couldn't review the
changes. Sorry if I missed something obvious :(

-- 
Mel Gorman
SUSE Labs
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