linux-kernel - Re: 2.6.21-rc5: swsusp: Not enough free memory

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Message-Id: <1176466896.7112.159.camel@nigel.suspend2.net>
Date:	Fri, 13 Apr 2007 22:21:36 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.osdl.org, pavel@...e.cz
Subject: Re: 2.6.21-rc5: swsusp: Not enough free memory

Hi.

On Fri, 2007-04-13 at 14:00 +0200, Rafael J. Wysocki wrote:
> > 
> > Shrinking memory...  Pages needed: 128103 normal, 0 highmem
> > Pages needed: 125226 normal, 0 highmem
> > Pages needed: -5757 normal, 0 highmem
> > Pages needed: -5757 normal, 0 highmem
> > Pages needed: -5757 normal, 0 highmem
> > Pages needed: -5757
> > Pages needed: 127953 normal, 0 highmem
> > Pages needed: 125076 normal, 0 highmem
> > Pages needed: -6043 normal, 0 highmem
> > Pages needed: -6043 normal, 0 highmem
> > Pages needed: -6043 normal, 0 highmem
> > Pages needed: -6043
> > done (200 pages freed)
> > Freed 800 kbytes in 0.16 seconds (5.00 MB/s)
> > Suspending console(s)
> > ...
> > CPU1 is down
> > swsusp: critical section:
> > swsusp: Need to copy 131358 pages
> > swsusp: Normal pages needed: 131358
> > swsusp: Normal pages needed: 131358 + 1024 + 22, available pages: 130607
> 
> Well, it looks like someone allocated about 6000 pages after we had freed
> enough memory for suspending.

We have a tunable allowance in Suspend2 for this, because fglrx
allocates a lot of pages in its suspend routine if DRI is enabled. I
think some other drivers do too, but fglrx is the main one I know.

Nigel


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