On Thu, Feb 01, 2024 at 04:05:40PM +0800, Qi Zheng wrote: > For kernel PTE page, we do not need to allocate and initialize its split > ptlock, but as a page table page, it's still necessary to add PG_table > flag and NR_PAGETABLE statistics for it. No, this is wrong. We do not account _kernel_ page tables to the _user_. Just because the kernel, say, called vmalloc() doesn't mean we should charge the task for it. Moreover, one task may call vmalloc() and a different task would then call vfree(). This is a can of worms you don't want to open. Why did you want to do this?
