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SubjectRe: [RFC PATCH v3 1/4] mm/page_alloc: fix incorrect isolation behavior by rechecking migratetype
On 08/26/2014 10:08 AM, Joonsoo Kim wrote:

> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index f86023b..51e0d13 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -740,9 +740,15 @@ static void free_one_page(struct zone *zone,
> if (nr_scanned)
> __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
>
> + if (unlikely(has_isolate_pageblock(zone))) {
> + migratetype = get_pfnblock_migratetype(page, pfn);
> + if (is_migrate_isolate(migratetype))
> + goto skip_counting;
> + }
> + __mod_zone_freepage_state(zone, 1 << order, migratetype);
> +
> +skip_counting:

Here, wouldn't a simple 'else __mod_zone_freepage_state...' look better
than goto + label? (same for the following 2 patches). Or does that
generate worse code?

> __free_one_page(page, pfn, zone, order, migratetype);
> - if (unlikely(!is_migrate_isolate(migratetype)))
> - __mod_zone_freepage_state(zone, 1 << order, migratetype);
> spin_unlock(&zone->lock);
> }
>
> diff --git a/mm/page_isolation.c b/mm/page_isolation.c
> index d1473b2..1fa4a4d 100644
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -60,6 +60,7 @@ out:
> int migratetype = get_pageblock_migratetype(page);
>
> set_pageblock_migratetype(page, MIGRATE_ISOLATE);
> + zone->nr_isolate_pageblock++;
> nr_pages = move_freepages_block(zone, page, MIGRATE_ISOLATE);
>
> __mod_zone_freepage_state(zone, -nr_pages, migratetype);
> @@ -83,6 +84,7 @@ void unset_migratetype_isolate(struct page *page, unsigned migratetype)
> nr_pages = move_freepages_block(zone, page, migratetype);
> __mod_zone_freepage_state(zone, nr_pages, migratetype);
> set_pageblock_migratetype(page, migratetype);
> + zone->nr_isolate_pageblock--;
> out:
> spin_unlock_irqrestore(&zone->lock, flags);
> }
>



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