linux-kernel - Re: [PATCHv2, RFC 18/30] thp, mm: truncate support for transparent huge page cache

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Date:	Fri, 22 Mar 2013 11:29:57 -0700
From:	Dave <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2, RFC 18/30] thp, mm: truncate support for transparent
 huge page cache

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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