2.6.35-rc4 Graphics performance issue and freeing invalid memtype messages on boot.

[Andrew Morton]

(Rafael, Maciej: two probably-separate post-2.6.34 regressions here)

On Tue, 06 Jul 2010 22:22:17 +1000
Andrew Hendry <andrew.hendry at gmail.com> wrote:

> 
> Some extra messages when booting with -rc4. Didn't get them in -rc3.
> [    1.387013] swapper:1 freeing invalid memtype bf788000-bf789000
> [    1.387409] swapper:1 freeing invalid memtype bf789000-bf78a000
> [    5.999675] modprobe:548 freeing invalid memtype d0000000-d0040000
> [    6.068347] modprobe:548 freeing invalid memtype d0140000-d0150000
> [    6.068647] modprobe:548 freeing invalid memtype d0150000-d0160000
> [    6.069661] modprobe:548 freeing invalid memtype d0170000-d01f0000
> [    6.085969] modprobe:548 freeing invalid memtype d01f0000-d0200000
> [    6.087673] modprobe:548 freeing invalid memtype d0210000-d0220000
> [    6.087900] modprobe:548 freeing invalid memtype d0220000-d0230000
> [    6.088092] modprobe:548 freeing invalid memtype d0230000-d0240000
> [    6.088317] modprobe:548 freeing invalid memtype d0240000-d0250000

hrmpf, one of those wonderful messages where neither it nor its source
code give you any clue regarding what caused it nor how to fix it.

please, apply this:

--- a/arch/x86/mm/pat.c~a
+++ a/arch/x86/mm/pat.c
@@ -359,7 +359,7 @@ int free_memtype(u64 start, u64 end)
 	entry = rbt_memtype_erase(start, end);
 	spin_unlock(&memtype_lock);
 
-	if (!entry) {
+	if (WARN_ON(!entry)) {
 		printk(KERN_INFO "%s:%d freeing invalid memtype %Lx-%Lx\n",
 			current->comm, current->pid, start, end);
 		return -EINVAL;


and let's at least see where it's coming from.

> Not sure if its related, but also have a noticeable performance issue with graphics under rc4.
> Dragging and resizing windows, screen updates, and jumpy cursor are all slow.
> Playing a full screen video under vlc gets only 1-2 frames per second, but plays fine under rc3.
> Tested a kernel compile, it was roughly the same.
> Userspace is ubunutu 10.04 64bit. 
> 
> Any hints? Otherwise will start a bisect tomorrow night.
> 
> Config attached, lspci, rc3 and rc4 boot messages below:

What graphics hardware are you using?