Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [patches] [PATCH] [28/34] i386: pte xchg optimization | Date | Wed, 2 May 2007 13:05:40 +0200 |
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> I always wondered why the xchg is necessary here at all. If the process of > tearing down a page table entry has started, other users of the mapped > linear address are broken anyway - why is it necessary to still monitor the > effect they may have on the A/D bits, unless this is a transient tear down? > > Checking for the uses of ptep_get_and_clear, I would judge that the use in > change_pte_range() may in fact need the xchg, but the uses in > vunmap_pte_range() and zap_pte_range() shouldn't.
Yes I agree. Might be a nice speed up for exit to distingush the cases.
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