linux-kernel - Re: [PATCH v5 4/4] add profile information for invalidated page

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Date:	Sat, 19 Feb 2011 08:38:36 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Barrett <damentz@...uorix.net>,
	Ben Gamari <bgamari.foss@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH v5 4/4] add profile information for invalidated page

On Sat, Feb 19, 2011 at 8:17 AM, Mel Gorman <mel@....ul.ie> wrote:
> On Sat, Feb 19, 2011 at 07:07:01AM +0900, Minchan Kim wrote:
>> Hi Mel,
>>
>> On Sat, Feb 19, 2011 at 1:58 AM, Mel Gorman <mel@....ul.ie> wrote:
>> > On Fri, Feb 18, 2011 at 12:08:22AM +0900, Minchan Kim wrote:
>> >> This patch adds profile information about invalidated page reclaim.
>> >> It's just for profiling for test so it is never for merging.
>> >>
>> >> Acked-by: 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>
>> >> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
>> >> ---
>> >>  include/linux/vmstat.h |    4 ++--
>> >>  mm/swap.c              |    3 +++
>> >>  mm/vmstat.c            |    3 +++
>> >>  3 files changed, 8 insertions(+), 2 deletions(-)
>> >>
>> >> diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
>> >> index 833e676..c38ad95 100644
>> >> --- a/include/linux/vmstat.h
>> >> +++ b/include/linux/vmstat.h
>> >> @@ -30,8 +30,8 @@
>> >>
>> >>  enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
>> >>               FOR_ALL_ZONES(PGALLOC),
>> >> -             PGFREE, PGACTIVATE, PGDEACTIVATE,
>> >> -             PGFAULT, PGMAJFAULT,
>> >> +             PGFREE, PGACTIVATE, PGDEACTIVATE, PGINVALIDATE,
>> >> +             PGRECLAIM, PGFAULT, PGMAJFAULT,
>> >>               FOR_ALL_ZONES(PGREFILL),
>> >>               FOR_ALL_ZONES(PGSTEAL),
>> >>               FOR_ALL_ZONES(PGSCAN_KSWAPD),
>> >> diff --git a/mm/swap.c b/mm/swap.c
>> >> index 0a33714..980c17b 100644
>> >> --- a/mm/swap.c
>> >> +++ b/mm/swap.c
>> >> @@ -397,6 +397,7 @@ static void lru_deactivate(struct page *page, struct zone *zone)
>> >>                * is _really_ small and  it's non-critical problem.
>> >>                */
>> >>               SetPageReclaim(page);
>> >> +             __count_vm_event(PGRECLAIM);
>> >>       } else {
>> >>               /*
>> >>                * The page's writeback ends up during pagevec
>> >
>> > Is this name potentially misleading?
>> >
>> > Pages that are reclaimed are accounted for with _steal. It's not particularly
>> > obvious but that's the name it was given. I'd worry that an administrator that
>> > was not aware of *_steal would read pgreclaim as "pages that were reclaimed"
>> > when this is not necessarily the case.
>> >
>> > Is there a better name for this? pginvalidate_deferred
>> > or pginvalidate_delayed maybe?
>> >
>>
>> Yep. Your suggestion is fair enough. But as I said in description,
>> It's just for testing for my profiling, not merging so I didn't care
>> about it. I don't think we need new vmstat of pginvalidate.
>>
>
> My bad. I was treating this piece of information as something we'd keep
> around and did not read the introduction clearly enough. If it's just for
> evaluation, the name does not matter as long as the reviewers know what it
> is. The figures look good and I have no problem with the series. I didn't
> ack the memcg parts but only because memcg is not an area I'm familiar enough
> for my ack to proper meaning. If there are no other objections, I'd suggest
> resubmitting minus this patch.

Okay. I will wait any comments from others by this week and resubmit
the series at next week as remove profiling patch.
Thanks, Mel.

>
> Thanks.
>
> --
> Mel Gorman
> SUSE Labs
>
> --
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-- 
Kind regards,
Minchan Kim
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