Wonder where that came from?
> My main reason for adding the anon flag was to prove to myself that the
> mapping pointer can be trusted. Apparently it can, generally, but it looks
> like I haven't successfully tracked down all the places that should set it.
> It looks like anon pages can come from random sources, so it might be an
> impossible task to find them all.
Yes, the debug check is important at this time.
> I know you said you like the idea of having the flag, but I think the
> cleanest fix would be to change the check from
>
> if (PageAnon(page))
> to
> if (page->mapping && !PageSwapCache(page))
Well I'm not particularly overjoyed by the flag. What I liked was that we
have a place where we can implement anonymous page counting, so we get
another interesting number in /proc/meminfo. Minor point.
> Or I could set the anon flag based on that test. I know page flags are
> getting scarce, so I'm leaning toward removing the flag entirely.
>
> What would you recommend?
Keep the flag for now, find the escaped page under X, remove the flag later?
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