From: Pavel Machek <pavel@ucw.cz>
To: Shaohua Li <shaohua.li@intel.com>
Cc: Linux-pm mailing list <linux-pm@lists.osdl.org>
Subject: Re: swsusp and PSE
Date: Mon, 5 Jun 2006 11:39:17 +0200 [thread overview]
Message-ID: <20060605093917.GA27474@elf.ucw.cz> (raw)
In-Reply-To: <1149472065.32046.163.camel@sli10-desk.sh.intel.com>
On Po 05-06-06 09:47:45, Shaohua Li wrote:
> On Thu, 2006-06-01 at 22:24 +0800, Pavel Machek wrote:
> > On Čt 01-06-06 10:17:22, Nicolas Troncoso Carrere wrote:
> > > Hi,
> > > I was trying out swsusp, but up bumped up with the issue that it
> > needs PSE.
> > > I've been reading the source, but havent been able to get a grasp on
> > why does
> > > it need PSE.
> > > Could you enlighten me?
> >
> > W/o PSE, we are using pagetables during data copy, and we may
> > overwrite pagetable that is still used.
> w/PSE pagetable might be overwritten too and data copy uses identity
> mapping, overwrite pagetable doesn't harm to me.
w/PSE, identity mapping is fully contained in top-level pagedir, and
that is properly marked nosave.
wo/PSE, you'd need to properly mark nosave not only top-level pagedir,
but also all the needed descendants. Not impossible, just a bit
tricky, see x86-64 version for inspiration.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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prev parent reply other threads:[~2006-06-05 9:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-01 14:17 swsusp and PSE Nicolas Troncoso Carrere
2006-06-01 14:24 ` Pavel Machek
2006-06-05 1:47 ` Shaohua Li
2006-06-05 9:39 ` Pavel Machek [this message]
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