Re: [linux-next:master] [mm] 7b32f64bc5: pts.svt-av1.Preset13.Bosphorus4K.frames_per_second 45.8% regression

On Thu, Jun 18, 2026 at 11:30:47AM +0200, Jan Kara wrote:
> On Thu 18-06-26 16:00:42, kernel test robot wrote:
> > Hello,
> >
> > kernel test robot noticed a 45.8% regression of pts.svt-av1.Preset13.Bosphorus4K.frames_per_second on:
>
> This one looks serious enough and real. It would be good to figure out what
> happens in this benchmark that it benefits from the readahead across VMA
> boundaries so much...

I think a revert first no? This seems pretty huge for something that isn't key
to the kernel, then a new attempt can be tried with this issue addressed
perhaps?

I seem to recall objecting to this in the past, had a look around and saw [0]
which has some discussion I think specifically on the VMA boundaries thing.

[0]:https://lore.kernel.org/linux-mm/CAC_TJvfG8GcwG_2w1o6GOTZS8tfEx2h9A91qsenYfYsX8Te=Bg@mail.gmail.com/

(Sorry to be naggy buuut :) - I see there wasn't maintainer [Matthew] signoff on
this, we should really be in the habit of _requiring_ that for merge).

Thanks, Lorenzo