Messages in this thread | | | From | David Mosberger <> | Date | Mon, 24 May 2004 21:43:00 -0700 | Subject | Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE |
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>>>>> On Tue, 25 May 2004 06:20:54 +0200, Andrea Arcangeli <andrea@suse.de> said:
Andrea> the only architecture that has the accessed bit in Andrea> _hardware_ via page faults I know is ia64, but I don't know Andrea> if it has a mode to set it without page faults
No, it doesn't.
Andrea> and how it is implementing the accessed bit in linux.
If the "accessed" or "dirty" bits are zero, accessing/writing the page will cause a fault which will be handled in a low-level fault handler. The Linux version of these handlers simply turn on the respective bit. See daccess_bit(), iaccess_bit(), and dirty_bit() in arch/ia64/kernel/ivt.S.
Note: I'm on travel and haven't seen the context of this discussion and don't expect to have time to think about this until I return on Thursday. So if you don't hear from me, it's not because I'm ignoring you... ;-)
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