On Tue, Jun 10, 2014 at 11:46:40PM +0300, Kirill A. Shutemov wrote:
> Agreed. The patchset drops tail page refcounting.
Very possibly I misread something or a later patch fixes this up, I
just did a basic code review, but from the new code of split_huge_page
it looks like it returns -EBUSY after checking the individual tail
page refcounts, so it's not clear how that defines as "dropped".
+ for (i = 0; i < HPAGE_PMD_NR; i++)
+ tail_count += page_mapcount(page + i);
+ if (tail_count != page_count(page) - 1) {
+ BUG_ON(tail_count > page_count(page) - 1);
+ compound_unlock(page);
+ spin_unlock_irq(&zone->lru_lock);
+ return -EBUSY;
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