linux-kernel - Re: [PATCH v3] vmscan/trace: Add 'file' info to trace_mm_vmscan_lru

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Message-Id: <20111216143753.07588b01.akpm@linux-foundation.org>
Date:	Fri, 16 Dec 2011 14:37:53 -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>,
	Minchan Kim <minchan.kim@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH v3] vmscan/trace: Add 'file' info to
 trace_mm_vmscan_lru_isolate.

On Wed, 14 Dec 2011 23:14:53 +0800
Tao Ma <tm@....ma> wrote:

> From: Tao Ma <boyu.mt@...bao.com>
> 
> In trace_mm_vmscan_lru_isolate, we don't output 'file'
> information to the trace event and it is a bit inconvenient for the
> user to get the real information(like pasted below).
> mm_vmscan_lru_isolate: isolate_mode=2 order=0 nr_requested=32 nr_scanned=32
> nr_taken=32 contig_taken=0 contig_dirty=0 contig_failed=0
> 
> 'active' can be gotten by analyzing mode(Thanks go to Minchan and Mel),
> So this patch adds 'file' to the trace event and it now looks like:
> mm_vmscan_lru_isolate: isolate_mode=2 order=0 nr_requested=32 nr_scanned=32
> nr_taken=32 contig_taken=0 contig_dirty=0 contig_failed=0 file=0
> 
> ...
>
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1249,7 +1249,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
>  	*scanned = scan;
>  
>  	trace_mm_vmscan_memcg_isolate(0, nr_to_scan, scan, nr_taken,
> -				      0, 0, 0, mode);
> +				      0, 0, 0, mode, file);
>  
>  	return nr_taken;
>  }

This tracepoint was removed by Johannes's "mm: make per-memcg LRU lists
exclusive".

> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index f54a05b..a444dc0 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -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, file);
>  	return nr_taken;
>  }

So this is the only remaining site for that tracepoint.
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