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Date:	Wed, 11 Jun 2014 11:48:55 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 08/10] mm, compaction: pass gfp mask to compact_control

On Mon, Jun 09, 2014 at 11:26:20AM +0200, Vlastimil Babka wrote:
> From: David Rientjes <rientjes@...gle.com>
> 
> struct compact_control currently converts the gfp mask to a migratetype, but we
> need the entire gfp mask in a follow-up patch.
> 
> Pass the entire gfp mask as part of struct compact_control.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
> Cc: Michal Nazarewicz <mina86@...a86.com>
> Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Christoph Lameter <cl@...ux.com>
> Cc: Rik van Riel <riel@...hat.com>
> ---
>  mm/compaction.c | 12 +++++++-----
>  mm/internal.h   |  2 +-
>  2 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index c339ccd..d1e30ba 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -965,8 +965,8 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
>  	return ISOLATE_SUCCESS;
>  }
>  
> -static int compact_finished(struct zone *zone,
> -			    struct compact_control *cc)
> +static int compact_finished(struct zone *zone, struct compact_control *cc,
> +			    const int migratetype)

If we has gfp_mask, we could use gfpflags_to_migratetype from cc->gfp_mask.
What's is your intention?

>  {
>  	unsigned int order;
>  	unsigned long watermark;
> @@ -1012,7 +1012,7 @@ static int compact_finished(struct zone *zone,
>  		struct free_area *area = &zone->free_area[order];
>  
>  		/* Job done if page is free of the right migratetype */
> -		if (!list_empty(&area->free_list[cc->migratetype]))
> +		if (!list_empty(&area->free_list[migratetype]))
>  			return COMPACT_PARTIAL;
>  
>  		/* Job done if allocation would set block type */
> @@ -1078,6 +1078,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
>  	int ret;
>  	unsigned long start_pfn = zone->zone_start_pfn;
>  	unsigned long end_pfn = zone_end_pfn(zone);
> +	const int migratetype = gfpflags_to_migratetype(cc->gfp_mask);
>  	const bool sync = cc->mode != MIGRATE_ASYNC;
>  
>  	ret = compaction_suitable(zone, cc->order);
> @@ -1120,7 +1121,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
>  
>  	migrate_prep_local();
>  
> -	while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) {
> +	while ((ret = compact_finished(zone, cc, migratetype)) ==
> +						COMPACT_CONTINUE) {
>  		int err;
>  
>  		switch (isolate_migratepages(zone, cc)) {
> @@ -1178,7 +1180,7 @@ static unsigned long compact_zone_order(struct zone *zone, int order,
>  		.nr_freepages = 0,
>  		.nr_migratepages = 0,
>  		.order = order,
> -		.migratetype = gfpflags_to_migratetype(gfp_mask),
> +		.gfp_mask = gfp_mask,
>  		.zone = zone,
>  		.mode = mode,
>  	};
> diff --git a/mm/internal.h b/mm/internal.h
> index 584d04f..af15461 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -149,7 +149,7 @@ struct compact_control {
>  	bool finished_update_migrate;
>  
>  	int order;			/* order a direct compactor needs */
> -	int migratetype;		/* MOVABLE, RECLAIMABLE etc */
> +	const gfp_t gfp_mask;		/* gfp mask of a direct compactor */
>  	struct zone *zone;
>  	enum compact_contended contended; /* Signal need_sched() or lock
>  					   * contention detected during
> -- 
> 1.8.4.5
> 
> --
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-- 
Kind regards,
Minchan Kim
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