On Tue, Dec 16, 2014 at 4:00 PM, Linus Torvalds <torva...@linux-foundation.org> wrote: > On Tue, Dec 16, 2014 at 3:02 PM, Peter Zijlstra <pet...@infradead.org> wrote: >> >> OK, should we just stick it in the x86 tree and see if anything >> explodes? ;-) > > Gaah, I got confused about the patches. > > And something did explode, it showed some Xen nasties. Xen has that > odd "we don't share PMD entries between MM's" thing going on, which > means that the vmalloc fault thing does actually have to occasionally > walk two levels rather than just copy the top level. I'm still not > sure why Xen doesn't share PMD's, since threads that shame the MM > clearly can share PMD's within Xen, but I gave up on it.
Sounds like it's time to ask Konrad, the source of all Xen understanding :) Linus, do you have a pointer to whatever version of the patch you tried? --Andy > > That said, making x86-64 use "read_cr3()" instead of > "current->active_mm" would at least make things a bit safer wrt NMI's > during the task switch, of course. So *some* 32/64-bit consolidation > should be done, but my patch went a bit too far for Xen. > > Linus -- Andy Lutomirski AMA Capital Management, LLC -- 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/
