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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: Pavel Machek <pavel@ucw.cz>,
	linux-pm@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org,
	Nigel Cunningham <ncunningham@crca.org.au>
Subject: Re: [RFC 06/15] PM / Hibernate: swap, remove swap_map_handle usages
Date: Thu, 25 Mar 2010 22:35:35 +0100	[thread overview]
Message-ID: <201003252235.35500.rjw@sisk.pl> (raw)
In-Reply-To: <4BAA842A.6060906@gmail.com>

On Wednesday 24 March 2010, Jiri Slaby wrote:
> On 03/24/2010 09:33 PM, Pavel Machek wrote:
> > On Tue 2010-03-23 17:17:34, Jiri Slaby wrote:
> >> Some code, which will be moved out of swap.c, needs know nothing about
> >> swap. There will be also other than swap writers later, so that it
> >> won't make sense at all.
> >>
> >> Make it a global static in swap.c as a singleton.
> > 
> > I guess I just dislike global static. Logically, methods do operate on
> > handles, so...
> 
> Ok, "upper layers" may get a handle via .get_reader/writer. The downside
> is that they would have to get (void *) and pass (void *) down again. I
> wanted to avoid that (taking into account that it's a singleton).
> 
> > I don't see a point and I do not think the change is an improvement.
> 
> The point was to avoid (void *)'s and save users from transferring
> pointer as a handle. No matter what, the decision is not up to me,
> discussion indeed welcome.

The whole thing boils down to whether or not there may be more than one
swap map in use at a time.

Perhaps it's better to use a static pointer, though?

And I don't really know at this point how exactly this change is going to make
your life easier down the road.  Care to elaborate?

Rafael

  reply	other threads:[~2010-03-25 21:32 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-23 16:17 [RFC 01/15] FS: libfs, implement simple_write_to_buffer Jiri Slaby
2010-03-23 16:17 ` [RFC 02/15] PM / Hibernate: snapshot cleanup Jiri Slaby
2010-03-24 20:29   ` Pavel Machek
2010-03-24 22:35   ` Rafael J. Wysocki
2010-03-25  5:29   ` Pavel Machek
2010-03-23 16:17 ` [RFC 03/15] PM / Hibernate: separate block_io Jiri Slaby
2010-03-24 20:30   ` Pavel Machek
2010-03-24 21:22     ` Jiri Slaby
2010-03-24 22:58       ` Nigel Cunningham
2010-03-25  2:35         ` [linux-pm] " Nigel Cunningham
2010-03-25 20:12           ` Rafael J. Wysocki
2010-03-25 20:13             ` Nigel Cunningham
2010-03-25 20:33               ` Rafael J. Wysocki
2010-03-25 20:36                 ` Nigel Cunningham
2010-03-29 13:30             ` Pavel Machek
2010-03-25 14:29         ` Pavel Machek
2010-03-23 16:17 ` [RFC 04/15] PM / Hibernate: move the first_sector out of swsusp_write Jiri Slaby
2010-03-24 20:31   ` Pavel Machek
2010-03-25 21:26     ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 05/15] PM / Hibernate: group swap ops Jiri Slaby
2010-03-25 21:28   ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 06/15] PM / Hibernate: swap, remove swap_map_handle usages Jiri Slaby
2010-03-24 20:33   ` Pavel Machek
2010-03-24 21:29     ` Jiri Slaby
2010-03-25 21:35       ` Rafael J. Wysocki [this message]
2010-03-23 16:17 ` [RFC 07/15] PM / Hibernate: add sws_modules_ops Jiri Slaby
2010-03-24 20:36   ` Pavel Machek
2010-03-24 21:31     ` Jiri Slaby
2010-03-25 22:02   ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 08/15] PM / Hibernate: add user module_ops Jiri Slaby
2010-03-25 22:07   ` Rafael J. Wysocki
2010-03-26  9:43     ` Jiri Slaby
2010-03-23 16:17 ` [RFC 09/15] PM / Hibernate: user, implement user_ops writer Jiri Slaby
2010-03-24 20:42   ` Pavel Machek
2010-03-24 21:40     ` Jiri Slaby
2010-03-25 21:36       ` Pavel Machek
2010-03-25 22:14       ` Rafael J. Wysocki
2010-03-26  9:34         ` Jiri Slaby
2010-03-26 22:04           ` Rafael J. Wysocki
2010-03-29 15:33             ` Jiri Slaby
2010-03-27  7:02           ` Pavel Machek
2010-03-23 16:17 ` [RFC 10/15] PM / Hibernate: user, implement user_ops reader Jiri Slaby
2010-03-25  5:30   ` what the patches do " Pavel Machek
2010-03-25  5:42     ` Nigel Cunningham
2010-03-25  6:12       ` [linux-pm] " Nigel Cunningham
2010-03-25 20:14       ` Rafael J. Wysocki
2010-03-25 20:21         ` Nigel Cunningham
2010-03-25 20:29           ` Rafael J. Wysocki
2010-03-25 20:35             ` Nigel Cunningham
2010-03-25 21:13               ` Rafael J. Wysocki
2010-03-25 21:26             ` Pavel Machek
2010-03-25 21:49               ` [linux-pm] " Nigel Cunningham
2010-04-02  6:36                 ` Pavel Machek
2010-04-02 17:03                   ` Rafael J. Wysocki
2010-03-25 22:21     ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 11/15] PM / Hibernate: add chunk i/o support Jiri Slaby
2010-03-25 22:38   ` Rafael J. Wysocki
2010-03-26  9:09     ` Jiri Slaby
2010-03-26 10:02       ` Nigel Cunningham
2010-03-23 16:17 ` [RFC 12/15] PM / Hibernate: split snapshot_read_next Jiri Slaby
2010-03-25 22:44   ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 13/15] PM / Hibernate: split snapshot_write_next Jiri Slaby
2010-03-25 22:46   ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 14/15] PM / Hibernate: dealign swsusp_info Jiri Slaby
2010-03-25 22:46   ` Rafael J. Wysocki
2010-03-23 16:17 ` [RFC 15/15] PM / Hibernate: move non-swap code to snapshot.c Jiri Slaby
2010-03-25 22:50   ` Rafael J. Wysocki
2010-03-23 21:51 ` [RFC 01/15] FS: libfs, implement simple_write_to_buffer Rafael J. Wysocki
2010-03-23 22:09 ` [linux-pm] " Nigel Cunningham
2010-03-24 22:13 ` Rafael J. Wysocki

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