Re: [PATCH 2/3] compaction: compact unevictable page

[Rik van Riel]

On 11/12/2011 11:37 AM, Minchan Kim wrote:
> Now compaction doesn't handle mlocked page as it uses __isolate_lru_page
> which doesn't consider unevicatable page. It has been used by just lumpy so
> it was pointless that it isolates unevictable page. But the situation is
> changed. Compaction could handle unevictable page and it can help getting
> big contiguos pages in fragment memory by many pinned page with mlock.
>
> I tested this patch with following scenario.
>
> 1. A : allocate 80% anon pages in system
> 2. B : allocate 20% mlocked page in system
> /* Maybe, mlocked pages are located in low pfn address */
> 3. kill A /* high pfn address are free */
> 4. echo 1>  /proc/sys/vm/compact_memory
>
> old:
>
> compact_blocks_moved 251
> compact_pages_moved 44
>
> new:
>
> compact_blocks_moved 258
> compact_pages_moved 412
>
> CC: Mel Gorman<mgorman@xxxxxxx>
> CC: Johannes Weiner<jweiner@xxxxxxxxxx>
> CC: Rik van Riel<riel@xxxxxxxxxx>
> Signed-off-by: Minchan Kim<minchan.kim@xxxxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>


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