On Fri, 11 Mar 2022 10:13:28 -0800 Beau Belgrave <beaub@xxxxxxxxxxxxxxxxxxx> wrote: > Is that true as well for the user process that has this mapped? Will the > user process virtual memory that maps to this ever page it out? I > believe that was the concern. My understanding is by reserving in > kernel, even though it won't page out on that side, marks the user side > entry to not let it page out. My memory of the purpose of SetPageReserve() is a bit fuzzy, and there's not much use of it in the kernel. Just a hand full. I'll try to investigate it some more. > > The other thing is that this patch applied to 5.10.X on ARM64 does not > appear to hit this. Is it some weird interaction with something else or > was 5.10.X just getting lucky? Perhaps it's because you allocated the page with kzalloc and not just getting a page directly? Again, my knowledge in this area is lacking. I'm looking more into it. -- Steve
