linux-kernel - [RFC] A couple of questions about the paged I/O sub system

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Date:	Wed, 21 Oct 2015 14:39:58 +0800
From:	Ian Kent <raven@...maw.net>
To:	linux-kernel@...r.kernel.org
Subject: [RFC] A couple of questions about the paged I/O sub system

Hi all,

I've been looking through some of the page reclaim code and at
truncate_inode_pages().

I'm not familiar with the code and I'm struggling to understand it.

One thing that is puzzling me right now is, if a file has pages that
have been modified and are swapped out when pagevec_lookup_entries() is
called will they be found?

If not then how does truncate_inode_pages(_range)() handle waiting for
these pages to be swapped back in to perform the writeback and
truncation?

Anyone, please?
Ian

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