linux-kernel - Re: [PATCH] mm/compaction: __compact

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Date:	Tue, 24 Nov 2015 09:49:49 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <js1304@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Yaowei Bai <bywxiaobai@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH] mm/compaction: __compact_pgdat() code cleanuup

On 11/24/2015 07:24 AM, Joonsoo Kim wrote:
> This patch uses is_via_compact_memory() to distinguish direct compaction.
> And it also reduces indentation on compaction_defer_reset
> by filtering failure case. There is no functional change.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>   mm/compaction.c | 15 +++++++++------
>   1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index de3e1e7..2b1a15e 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1658,14 +1658,17 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
>   				!compaction_deferred(zone, cc->order))
>   			compact_zone(zone, cc);
>
> -		if (cc->order > 0) {
> -			if (zone_watermark_ok(zone, cc->order,
> -						low_wmark_pages(zone), 0, 0))
> -				compaction_defer_reset(zone, cc->order, false);
> -		}
> -
>   		VM_BUG_ON(!list_empty(&cc->freepages));
>   		VM_BUG_ON(!list_empty(&cc->migratepages));
> +
> +		if (is_via_compact_memory(cc->order))
> +			continue;

That's fine.

> +		if (!zone_watermark_ok(zone, cc->order,
> +				low_wmark_pages(zone), 0, 0))
> +			continue;
> +
> +		compaction_defer_reset(zone, cc->order, false);

Here I'd personally find the way of "if(watermark_ok) defer_reset()" 
logic easier to follow.

>   	}
>   }
>
>

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