On Fri, 2013-05-03 at 21:54 +1000, David Gibson wrote: > > _PAGE_BUSY is more like a read lock. It means it's being hashed, so what > > is not stable is _PAGE_HASHPTE, slot index, _ACCESSED and _DIRTY. The > > rest is stable and usually is what pmd_same looks at (though I have a > > small doubt vs. _ACCESSED and _DIRTY but at least x86 doesn't care since > > they are updated by HW). > > Ok. It still seems very odd to me that _PAGE_BUSY would be in the THP > version of _PAGE_HASHPTE, but not the normal one. Oh I agree, we should be consistent and it shouldn't be there, I was just correcting some other aspect of your statement :-) Cheers, Ben. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>