On Tue, Oct 29, 2024 at 09:30:41PM -0700, John Hubbard wrote: > I do, yes. And what happens is that when you use GPUs, drivers like > to pin system memory, and then point the GPU page tables to that > memory. For older GPUs that don't support replayable page faults, > that's required. > > So this behavior has been around forever. > > The customer was qualifying their software and noticed that before > Linux 6.10, they could allocate >2GB, and with 6.11, they could > not. > > Whether it is "wise" for user space to allocate that much at once > is a reasonable question, but at least one place is (or was!) doing > it. Still missing a callchain, which make me suspect that it is your weird out of tree driver, in which case this simply does not matter.
