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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH v4 5/7] add profile information for invalidated page reclaim
Cc: kosaki.motohiro@jp.fujitsu.com, Andrew Morton <akpm@linux-foundation.org>,
        Rik van Riel <riel@redhat.com>, linux-mm <linux-mm@kvack.org>,
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> Hi KOSAKI,
> 
> On Wed, Dec 8, 2010 at 5:02 PM, KOSAKI Motohiro
> <kosaki.motohiro@jp.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@gmail.com>
> >> Cc: Rik van Riel <riel@redhat.com>
> >> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> >> Cc: Wu Fengguang <fengguang.wu@intel.com>
> >> Cc: Johannes Weiner <hannes@cmpxchg.org>
> >> Cc: Nick Piggin <npiggin@kernel.dk>
> >> Cc: Mel Gorman <mel@csn.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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