Re: drm/nouneau: 5.11 cycle regression bisected to 461619f5c324 "drm/nouveau: switch to new allocator"

[Christian König]

Am 10.02.21 um 11:46 schrieb Mike Galbraith:
> On Wed, 2021-02-10 at 11:34 +0100, Christian König wrote:
> > What seems to happen here is that your system is low on resources and we
> > just try to free up pages.
> FWIW, box has oodles generic ram free right after boot.

Then I have no idea what happens here.

The returned pages are identical, only the overhead to allocate them is 
reduced significantly.

The only other idea I have is that this somehow changes the timing and 
exposes a bug somewhere else.

You could try to replace the "for (order = min(MAX_ORDER - 1UL, 
__fls(num_pages)); num_pages;" in ttm_pool_alloc() with "for (order = 0; 
num_pages;" to get the old behavior.

Regards,
Christian.

> 	-Mike