linux-kernel - Re: [PATCH v2 3/5] mm/compaction: print current range where compaction work

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Date:	Mon, 12 Jan 2015 15:34:53 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Mel Gorman <mgorman@...e.de>, David Rientjes <rientjes@...gle.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] mm/compaction: print current range where compaction
 work

On 01/12/2015 09:21 AM, Joonsoo Kim wrote:
> It'd be useful to know current range where compaction work for detailed
> analysis. With it, we can know pageblock where we actually scan and
> isolate, and, how much pages we try in that pageblock and can guess why
> it doesn't become freepage with pageblock order roughly.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  include/trace/events/compaction.h |   30 +++++++++++++++++++++++-------
>  mm/compaction.c                   |    9 ++++++---
>  2 files changed, 29 insertions(+), 10 deletions(-)
> 
> diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
> index 839f6fa..139020b 100644
> --- a/include/trace/events/compaction.h
> +++ b/include/trace/events/compaction.h
> @@ -11,39 +11,55 @@
>  
>  DECLARE_EVENT_CLASS(mm_compaction_isolate_template,
>  
> -	TP_PROTO(unsigned long nr_scanned,
> +	TP_PROTO(
> +		unsigned long start_pfn,
> +		unsigned long end_pfn,
> +		unsigned long nr_scanned,
>  		unsigned long nr_taken),
>  
> -	TP_ARGS(nr_scanned, nr_taken),
> +	TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken),
>  
>  	TP_STRUCT__entry(
> +		__field(unsigned long, start_pfn)
> +		__field(unsigned long, end_pfn)
>  		__field(unsigned long, nr_scanned)
>  		__field(unsigned long, nr_taken)
>  	),
>  
>  	TP_fast_assign(
> +		__entry->start_pfn = start_pfn;
> +		__entry->end_pfn = end_pfn;
>  		__entry->nr_scanned = nr_scanned;
>  		__entry->nr_taken = nr_taken;
>  	),
>  
> -	TP_printk("nr_scanned=%lu nr_taken=%lu",
> +	TP_printk("range=(0x%lx ~ 0x%lx) nr_scanned=%lu nr_taken=%lu",
> +		__entry->start_pfn,
> +		__entry->end_pfn,
>  		__entry->nr_scanned,
>  		__entry->nr_taken)
>  );
>  
>  DEFINE_EVENT(mm_compaction_isolate_template, mm_compaction_isolate_migratepages,
>  
> -	TP_PROTO(unsigned long nr_scanned,
> +	TP_PROTO(
> +		unsigned long start_pfn,
> +		unsigned long end_pfn,
> +		unsigned long nr_scanned,
>  		unsigned long nr_taken),
>  
> -	TP_ARGS(nr_scanned, nr_taken)
> +	TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
>  );
>  
>  DEFINE_EVENT(mm_compaction_isolate_template, mm_compaction_isolate_freepages,
> -	TP_PROTO(unsigned long nr_scanned,
> +
> +	TP_PROTO(
> +		unsigned long start_pfn,
> +		unsigned long end_pfn,
> +		unsigned long nr_scanned,
>  		unsigned long nr_taken),
>  
> -	TP_ARGS(nr_scanned, nr_taken)
> +	TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
>  );
>  
>  TRACE_EVENT(mm_compaction_migratepages,
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 2d86a20..be28469 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -429,11 +429,12 @@ isolate_fail:
>  
>  	}
>  
> +	trace_mm_compaction_isolate_freepages(*start_pfn, blockpfn,
> +					nr_scanned, total_isolated);
> +
>  	/* Record how far we have got within the block */
>  	*start_pfn = blockpfn;
>  
> -	trace_mm_compaction_isolate_freepages(nr_scanned, total_isolated);
> -
>  	/*
>  	 * If strict isolation is requested by CMA then check that all the
>  	 * pages requested were isolated. If there were any failures, 0 is
> @@ -589,6 +590,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
>  	unsigned long flags = 0;
>  	bool locked = false;
>  	struct page *page = NULL, *valid_page = NULL;
> +	unsigned long start_pfn = low_pfn;
>  
>  	/*
>  	 * Ensure that there are not too many pages isolated from the LRU
> @@ -749,7 +751,8 @@ isolate_success:
>  	if (low_pfn == end_pfn)
>  		update_pageblock_skip(cc, valid_page, nr_isolated, true);
>  
> -	trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
> +	trace_mm_compaction_isolate_migratepages(start_pfn, low_pfn,
> +						nr_scanned, nr_isolated);
>  
>  	count_compact_events(COMPACTMIGRATE_SCANNED, nr_scanned);
>  	if (nr_isolated)
> 

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