linux-kernel - Re: [linux-pm] [PATCH 1/9] PM / Hibernate: swap, switch to hibernate_io

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Message-ID: <4C065079.1020208@crca.org.au>
Date:	Wed, 02 Jun 2010 22:37:13 +1000
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Jiri Slaby <jslaby@...e.cz>
CC:	rjw@...k.pl, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com
Subject: Re: [linux-pm] [PATCH 1/9] PM / Hibernate: swap,	switch to hibernate_io_handle

Hi.

On 02/06/10 18:52, Jiri Slaby wrote:
> Hi,
>
> I addressed the comments I got on the previous RFC. I left the handles
> in place, the functions in hibernate_io_ops now works on them. Further
> I got rid of the memory barriers and minimized global variables as much
> as possible. Comments welcome.
>
> --
>
> Some code, which will be moved out of swap.c, will know nothing about
> swap. There will be also other than swap writers later, so that it
> won't make sense at all.
>
> So introduce a new structure called hibernate_io_handle which
> currently contains only a pointer to private data, but is independent
> on I/O reader/writer actually used. Private data are swap_map_handle
> for now.
>
> This structure is allocated in _start and freed in _finish. This will
> correspond to the later introduction of hibernate_io_ops where users
> will do handle=start->repeat{read/write(handle)}->finish(handle).
> I.e. they will operate on handle instead of global variables.

I'm starting on appending your patch series to mine (yes, I've given you 
no time to object :> I'm too keen!)

Since, in my tree, swap_map pages are history, I'll skip this patch.

Nigel
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