Re: [PATCH v4 1/4] mm: fix tracing in free_pcppages_bulk()

[Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>]

Hi Bartlomiej,

2012/09/14 23:29, Bartlomiej Zolnierkiewicz wrote:
> page->private gets re-used in __free_one_page() to store page order
> (so trace_mm_page_pcpu_drain() may print order instead of migratetype)
> thus migratetype value must be cached locally.
> 
> Fixes regression introduced in a701623 ("mm: fix migratetype bug
> which slowed swapping").

I think the regression has been alreadly fixed by following Mincahn's patches.

https://lkml.org/lkml/2012/9/6/635

=> Hi Minchan,

   Am I wrong?

Thanks,
Yasuaki Ishimatsu
 
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Michal Nazarewicz <mina86@mina86.com>
> Acked-by: Minchan Kim <minchan@kernel.org>
> Acked-by: Mel Gorman <mgorman@suse.de>
> Cc: Hugh Dickins <hughd@google.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> ---
>   mm/page_alloc.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 93a3433..e9da55c 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -668,12 +668,15 @@ static void free_pcppages_bulk(struct zone *zone, int count,
>   			batch_free = to_free;
>   
>   		do {
> +			int mt;
> +
>   			page = list_entry(list->prev, struct page, lru);
>   			/* must delete as __free_one_page list manipulates */
>   			list_del(&page->lru);
> +			mt = page_private(page);
>   			/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
> -			__free_one_page(page, zone, 0, page_private(page));
> -			trace_mm_page_pcpu_drain(page, 0, page_private(page));
> +			__free_one_page(page, zone, 0, mt);
> +			trace_mm_page_pcpu_drain(page, 0, mt);
>   		} while (--to_free && --batch_free && !list_empty(list));
>   	}
>   	__mod_zone_page_state(zone, NR_FREE_PAGES, count);
> 


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