Re: [PATCHv2, RFC 18/30] thp, mm: truncate support for transparenthuge page cache

From: Dave
Date: Fri Mar 22 2013 - 14:20:45 EST


On 03/14/2013 10:50 AM, Kirill A. Shutemov wrote:
> @@ -280,6 +291,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
> if (index > end)
> break;
>
> + VM_BUG_ON(PageTransHuge(page));
> lock_page(page);
> WARN_ON(page->index != index);
> wait_on_page_writeback(page);

This looks to be during the second truncate pass where things are
allowed to block. What's the logic behind it not being possible to
encounter TransHugePage()s here?
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