linux-kernel - Re: [PATCH v4 5/7] add profile information for invalidated page reclaim

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Message-Id: <20101208173520.1759.A69D9226@jp.fujitsu.com>
Date:	Wed,  8 Dec 2010 17:36:48 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH v4 5/7] add profile information for invalidated page reclaim

> Hi KOSAKI,
> 
> On Wed, Dec 8, 2010 at 5:02 PM, KOSAKI Motohiro
> <kosaki.motohiro@...fujitsu.com> wrote:
> >> This patch adds profile information about invalidated page reclaim.
> >> It's just for profiling for test so it would be discard when the series
> >> are merged.
> >>
> >> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> >> Cc: Rik van Riel <riel@...hat.com>
> >> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> >> Cc: Wu Fengguang <fengguang.wu@...el.com>
> >> Cc: Johannes Weiner <hannes@...xchg.org>
> >> Cc: Nick Piggin <npiggin@...nel.dk>
> >> Cc: Mel Gorman <mel@....ul.ie>
> >> ---
> >>  include/linux/vmstat.h |    4 ++--
> >>  mm/swap.c              |    3 +++
> >>  mm/vmstat.c            |    3 +++
> >>  3 files changed, 8 insertions(+), 2 deletions(-)
> >
> > Today, we have tracepoint. tracepoint has no overhead if it's unused.
> > but vmstat has a overhead even if unused.
> >
> > Then, all new vmstat proposal should be described why you think it is
> > frequently used from administrators.
> 
> It's just for easy gathering the data when Ben will test.
> I never want to merge it in upstream and even mmtom.

Ok, I had not understand your intention. Thank you.



> If you don't like it for just testing, I am happy to change it with tracepoint.





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