From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Paul Mackerras <paulus@samba.org>
Cc: Johannes Berg <johannes@sipsolutions.net>,
linux-pm@lists.linux-foundation.org, Pavel Machek <pavel@ucw.cz>
Subject: Re: shrinking memory for suspend?
Date: Thu, 3 May 2007 12:45:04 +0200 [thread overview]
Message-ID: <200705031245.05454.rjw@sisk.pl> (raw)
In-Reply-To: <17977.47777.929627.2150@cargo.ozlabs.ibm.com>
On Thursday, 3 May 2007 12:34, Paul Mackerras wrote:
> Rafael J. Wysocki writes:
>
> > I think that on a uniprocessor system it's quite safe, but on SMP it doesn't
> > seem so. For example, imagine the situation in which one CPU is executing the
> > suspend code while another one is running userspace with system calls etc.
> > Pretty scary.
>
> Which is why the powermac/powerbook sleep code insists on there only
> being one cpu active. I have an SMP powermac which can sleep; I use a
> little script to take the second cpu down before sleeping and bring it
> back up after waking up.
That's quite intrusive. Ideally, user space processes should not notice that
there have been a suspend at one point.
Greetings,
Rafael
next prev parent reply other threads:[~2007-05-03 10:45 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-30 14:24 shrinking memory for suspend? Johannes Berg
2007-04-30 15:09 ` Alan Stern
2007-04-30 15:10 ` Rafael J. Wysocki
2007-04-30 15:09 ` Johannes Berg
2007-04-30 19:57 ` Rafael J. Wysocki
2007-05-02 11:29 ` Pavel Machek
2007-05-02 14:02 ` Johannes Berg
2007-05-03 10:17 ` Rafael J. Wysocki
2007-05-03 10:34 ` Paul Mackerras
2007-05-03 10:45 ` Rafael J. Wysocki [this message]
2007-05-03 12:51 ` Paul Mackerras
2007-05-03 13:15 ` Rafael J. Wysocki
2007-05-03 16:34 ` Pavel Machek
2007-05-03 14:34 ` Alan Stern
2007-05-03 16:39 ` Rafael J. Wysocki
2007-05-03 23:32 ` Paul Mackerras
2007-05-04 9:02 ` Rafael J. Wysocki
2007-05-04 10:49 ` Paul Mackerras
2007-05-04 12:11 ` Rafael J. Wysocki
2007-05-04 15:05 ` Alan Stern
2007-05-03 11:33 ` Johannes Berg
2007-05-03 12:56 ` Rafael J. Wysocki
2007-05-04 10:48 ` Johannes Berg
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