On Mon, Aug 18, 2025 at 05:36:54PM -0700, Boris Burkov wrote: > Uncharged pages are tricky to track by their essential "uncharged" > nature. To maintain good accounting, introduce a vmstat counter tracking > all uncharged pages. Since this is only meaningful when cgroups are > configured, only expose the counter when CONFIG_MEMCG is set. I don't understand why this is needed. Maybe Shakeel had better reasoning that wasn't captured in the commit message. If they're unaccounted, then you can get a good estimate of them just by subtracting the number of accounted pages from the number of file pages. Sure there's a small race between the two numbers being updated, so you migth be off by a bit.
