>>> >From that perspective, the dependency on X86 is awful. What's the >>> problem here and what do other architectures need to do to be able to >>> support the feature? >> >> The problem here is that I don't know what free bits are available on >> page table entries on other architectures. I was about to resolve this >> for ARM very soon, but for the rest of them I need help from other people. > > Well, this is also a thing arch maintainers can do when they feel a > need to support the feature on their architecture. To support them at > that time we should provide them with a) adequate information in an > easy-to-find place (eg, a nice comment at the site of the reference x86 > implementation) and b) a userspace test app.
Item a) is presumably covered with two things -- required arch-specific PTE manipulations are all collected in asm-generic/pgtable.h under the !CONFIG_HAVE_ARCH_SOFT_DIRTY and the Documentation/vm/soft-dirty.txt pointed by the API clear_refs_soft_dirty()'s comment. Item b) was recently merged. Item c) from Stephen is already sent. Thank you for your time and help, Pavel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
