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

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Date:	Sat, 19 Feb 2011 07:07:01 +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

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.

-- 
Kind regards,
Minchan Kim
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