linux-kernel - Re: [RFC PATCH -tip 0/5] perf tools: pagecache monitoring

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Date:	Thu, 28 Jul 2011 20:28:35 -0400
From:	Keiichi KII <k-keiichi@...jp.nec.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Wu Fengguang <fengguang.wu@...el.com>, Mel Gorman <mel@....ul.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"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>,
	"BA, Moussa" <Moussa.BA@...onyx.com>
Subject: Re: [RFC PATCH -tip 0/5] perf tools: pagecache monitoring

>> My patches are based on the latest "linux-tip.git" tree and
>> also the following 3 commits in "tip:tracing/mm" and a "pagecache
>> object collections" patch. 
>>
>>   - dcac8cd: tracing/mm: add page frame snapshot trace
>>   - 1487a7a: tracing/mm: fix mapcount trace record field
>>   - eb46710: tracing/mm: rename 'trigger' file to 'dump_range'
>>   - http://lkml.org/lkml/2010/2/9/156
>>
>> Any comments are welcome.
> 
> I totally like the approach you have taken here.
> 
> Note that tracepoints need a detailed, careful review from interested 
> mm folks.
> 
> The set of tracepoints does not have to be complete but the 
> tracepoints have to be well thought out and near-perfect in this 
> context they are instrumenting, with an eye on future extensions with 
> the goal of making them painless.
> 
> the pagecache tracepoints you have added are:
> 
>  include/trace/events/filemap.h |   75 ++++++++++++++++++++++++++++++++++++++++
>  mm/filemap.c                   |    4 ++
>  mm/truncate.c                  |    2 +
>  mm/vmscan.c                    |    2 +
>  4 files changed, 83 insertions(+), 0 deletions(-)
> 
> So once such kind of review has been iterated through and Andrew et 
> al is happy with it i'd be more than happy to dust off the tracing/mm 
> bits (which have been done two years ago) and get it all to Linus.
> 
> Andrew, Mel, Fengguang?

Thank you for your comments. 
And I agree the tracepoints need reviews from mm folks.
I think the patches in tracing/mm are useful for monitoring mm behavior.
Is there any comments for these patches(especially the tracepoints)?
Any comments are welcome.

Thanks,
Keiichi
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