Date: Tue, 9 May 2006 15:27:13 -0700
From: Andrew Morton <akpm@osdl.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-kernel@vger.kernel.org, nickpiggin@yahoo.com.au, pavel@suse.cz
Subject: Re: [PATCH -mm] swsusp: support creating bigger images (rev. 2)
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"Rafael J. Wysocki" <rjw@sisk.pl> wrote:
>
> Now if the mapped pages that are not mapped by the
>  current task are considered, it turns out that they would change only if they
>  were reclaimed by try_to_free_pages(). ?Thus if we take them out of reach
>  of try_to_free_pages(), for example by (temporarily) moving them out of their
>  respective LRU lists after creating the image, we will be able to include them
>  in the image without copying.

I'm a bit curious about how this is true.  There are all sorts of way in
which there could be activity against these pages - interrupt-time
asynchronous network Tx completion, async interrupt-time direct-io
completion, tasklets, schedule_work(), etc, etc.

So...  could we check your homework on this please?  How come only page
reclaim can disturb these pages?
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