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

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Message-ID: <20110218165827.GB13246@csn.ul.ie>
Date:	Fri, 18 Feb 2011 16:58:27 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Minchan Kim <minchan.kim@...il.com>
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 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?

> @@ -409,6 +410,8 @@ static void lru_deactivate(struct page *page, struct zone *zone)
>  
>  	if (active)
>  		__count_vm_event(PGDEACTIVATE);
> +
> +	__count_vm_event(PGINVALIDATE);
>  	update_page_reclaim_stat(zone, page, file, 0);
>  }
>  
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index 0c3b504..cbe032b 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -896,6 +896,9 @@ static const char * const vmstat_text[] = {
>  	"pgactivate",
>  	"pgdeactivate",
>  
> +	"pginvalidate",
> +	"pgreclaim",
> +
>  	"pgfault",
>  	"pgmajfault",
>  
> -- 
> 1.7.1
> 

-- 
Mel Gorman
SUSE Labs
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