Nick Piggin wrote:
Eric Dumazet wrote:
Two things can happen here.
If this program used the pages before the kernel needed
them, the program will be reusing its old pages.
ah ok, this is because accessed/dirty bits are set by hardware and not
a page fault.
No it isn't.
That is to say, it isn't required for correctness. But if the
question was about avoiding a fault, then yes ;)
But as Linus recently said, even hardware handled faults still
take expensive microarchitectural traps.
Is it true for all architectures ?
No.
--
SUSE Labs, Novell Inc.
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