linux-kernel - Re: [PATCH V2] vmscan/trace: Add 'active' and 'file' info to trace_mm_vmscan_lru

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Date:	Tue, 13 Dec 2011 16:45:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tao Ma <tm@....ma>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH V2] vmscan/trace: Add 'active' and 'file' info to
 trace_mm_vmscan_lru_isolate.

On Sun, 11 Dec 2011 22:46:24 +0800
Tao Ma <tm@....ma> wrote:

> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1103,7 +1103,7 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode, int file)
>  static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
>  		struct list_head *src, struct list_head *dst,
>  		unsigned long *scanned, int order, isolate_mode_t mode,
> -		int file)
> +		int active, int file)
>  {
>  	unsigned long nr_taken = 0;
>  	unsigned long nr_lumpy_taken = 0;
> @@ -1221,7 +1221,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
>  			nr_to_scan, scan,
>  			nr_taken,
>  			nr_lumpy_taken, nr_lumpy_dirty, nr_lumpy_failed,
> -			mode);
> +			mode, active, file);
>  	return nr_taken;
>  }
>  
> @@ -1237,7 +1237,7 @@ static unsigned long isolate_pages_global(unsigned long nr,
>  	if (file)
>  		lru += LRU_FILE;
>  	return isolate_lru_pages(nr, &z->lru[lru].list, dst, scanned, order,
> -								mode, file);
> +							mode, active, file);
>  }

It would be nice to avoid adding permanent runtime overhead on behalf
of tracing.  It sounds like sending "mode" will satisfy this - please
check that in the v2 patch. 

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