From: Oliver Neukum <oliver@neukum.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>,
Linux-pm mailing list <linux-pm@lists.osdl.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: [RFC] sleepy linux
Date: Wed, 2 Jan 2008 11:52:51 +0100 [thread overview]
Message-ID: <200801021152.52639.oliver@neukum.org> (raw)
In-Reply-To: <20071231144447.GD26339@ucw.cz>
Am Montag, 31. Dezember 2007 15:44:47 schrieb Pavel Machek:
> On Sun 2007-12-30 17:39:42, Oliver Neukum wrote:
> > But what's wrong with calling suspend() the conventional way once you've
> > decided to go into sleepy mode?
>
> I'm not sure if it can be done in non-racy way. It is different from
> "conventional" suspend(): you can still have userland requests after
> this suspend(), and you should abort auto-sleep if you get one. (As
> opposed to blocking in system suspend case).
But we are always racing against hardware in these cases.
Strictly speaking you cannot have pure userland request. If no task
is runnable and no timer about to fire any activity will require kernel
activity unless you are doing direct hardware access from user space
which in the generic case precludes suspension anyway.
Regards
Oliver
next prev parent reply other threads:[~2008-01-02 10:52 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-25 23:07 [RFC] sleepy linux Pavel Machek
2007-12-26 17:28 ` Oliver Neukum
2007-12-26 19:02 ` Pavel Machek
2007-12-26 20:17 ` Pavel Machek
2007-12-26 20:23 ` Oliver Neukum
2007-12-26 20:32 ` Pavel Machek
2007-12-26 23:15 ` Oliver Neukum
2007-12-29 23:48 ` Pavel Machek
2007-12-27 9:41 ` Oliver Neukum
2007-12-29 23:51 ` Pavel Machek
2007-12-30 16:39 ` Oliver Neukum
2007-12-31 14:44 ` Pavel Machek
2008-01-02 10:52 ` Oliver Neukum [this message]
2007-12-26 18:56 ` H. Peter Anvin
2007-12-26 19:00 ` Pavel Machek
2007-12-26 19:22 ` H. Peter Anvin
2007-12-26 20:08 ` Oliver Neukum
2007-12-26 20:43 ` H. Peter Anvin
2007-12-26 20:51 ` Pavel Machek
2007-12-26 20:54 ` H. Peter Anvin
2007-12-29 23:44 ` Pavel Machek
2007-12-26 20:09 ` [linux-pm] " Igor Stoppa
2007-12-30 11:15 ` Ingo Molnar
2008-01-05 21:51 ` Pavel Machek
2008-01-08 16:37 ` Ingo Molnar
2008-01-08 19:15 ` Pavel Machek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200801021152.52639.oliver@neukum.org \
--to=oliver@neukum.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@lists.osdl.org \
--cc=pavel@ucw.cz \
--cc=rjw@sisk.pl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox