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

[Andrew Hendry]

Graphics hardware is NV250 type card.

Some quick testing last night showed this patch fixed both the boot
messages and graphics performance.
[tip:x86/urgent] rbtree: Undo augmented trees performance damage and regression
http://marc.info/?l=linux-kernel&m=127833440902862&w=2


On Fri, Jul 9, 2010 at 8:26 AM, Andrew Morton <akpm at linux-foundation.org> wrote:
> (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?
>
>