From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: shrinking memory for suspend?
Date: Thu, 3 May 2007 14:56:51 +0200
Message-ID: <200705031456.51546.rjw@sisk.pl>
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To: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-pm@lists.linux-foundation.org, Pavel Machek <pavel@ucw.cz>
List-Id: linux-pm@vger.kernel.org

On Thursday, 3 May 2007 13:33, Johannes Berg wrote:
> On Thu, 2007-05-03 at 12:17 +0200, Rafael J. Wysocki wrote:
> 
> > 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.
> 
> We can still hot-unplug all the other CPUs though, no?

We used to, but now we're "hot-unplugging" them after suspending devices.

Besides, preemptible kernels are not much different from SMP in that respect,
so ...

Greetings,
Rafael