mm: batch-free pcp list if possible
free_pcppages_bulk() frees pages from pcp lists in a round-robin fashion by keeping batch_free counter. But it doesn't need to spin if there is only one non-empty list. This can be checked by batch_free == MIGRATE_PCPTYPES. [akpm@linux-foundation.org: fix comment] Signed-off-by: Namhyung Kim <namhyung@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -614,6 +614,10 @@ static void free_pcppages_bulk(struct zone *zone, int count,
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list = &pcp->lists[migratetype];
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} while (list_empty(list));
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/* This is the only non-empty list. Free them all. */
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if (batch_free == MIGRATE_PCPTYPES)
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batch_free = to_free;
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do {
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page = list_entry(list->prev, struct page, lru);
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/* must delete as __free_one_page list manipulates */
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