linux-kernel - Re: [RFC PATCH 03/10] mm/compaction: always update cached pfn

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Message-ID: <558BC50E.3030000@suse.cz>
Date:	Thu, 25 Jun 2015 11:08:30 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [RFC PATCH 03/10] mm/compaction: always update cached pfn

I can has commit log? :)

On 06/25/2015 02:45 AM, Joonsoo Kim wrote:
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>   mm/compaction.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
>
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 9c5d43c..2d8e211 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -510,6 +510,10 @@ isolate_fail:
>   	if (locked)
>   		spin_unlock_irqrestore(&cc->zone->lock, flags);
>
> +	if (blockpfn == end_pfn &&
> +		blockpfn > cc->zone->compact_cached_free_pfn)
> +		cc->zone->compact_cached_free_pfn = blockpfn;
> +
>   	update_pageblock_skip(cc, valid_page, total_isolated,
>   			*start_pfn, end_pfn, blockpfn, false);
>
> @@ -811,6 +815,13 @@ isolate_success:
>   	if (locked)
>   		spin_unlock_irqrestore(&zone->lru_lock, flags);
>
> +	if (low_pfn == end_pfn && cc->mode != MIGRATE_ASYNC) {
> +		int sync = cc->mode != MIGRATE_ASYNC;
> +
> +		if (low_pfn > zone->compact_cached_migrate_pfn[sync])
> +			zone->compact_cached_migrate_pfn[sync] = low_pfn;
> +	}
> +
>   	update_pageblock_skip(cc, valid_page, nr_isolated,
>   			start_pfn, end_pfn, low_pfn, true);
>
>

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