On 05/01/2019 20:38, Vlastimil Babka wrote:
[...]

I was thinking about "return true" here, assuming that userspace generally wants
to ensure itself there won't be page faults when it starts doing something
critical, and if it sees a "false" it will try to do some kind of prefaulting,
possibly in a loop. There might be somebody trying to make sure something is out

Isn't that racy by design as the pages may get flushed out after the check?
Shouldn't the application use e.g. mlock()/.... to guarantee no page
faults in the first place?

MfG,
	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@petrovitsch.priv.at
                     LUGA : http://www.luga.at