Ingo, before applying this, please apply these two KASAN fixes: http://lkml.kernel.org/g/1452516679-32040-2-git-send-email-aryabi...@virtuozzo.com http://lkml.kernel.org/g/1452516679-32040-3-git-send-email-aryabi...@virtuozzo.com
Without those fixes, this series will trigger a KASAN bug. This is a straightforward speedup on Ivy Bridge and newer, IIRC. (I tested on Skylake. INVPCID is not available on Sandy Bridge. I don't have Ivy Bridge, Haswell or Broadwell to test on, so I could be wrong as to when the feature was introduced.) I think we should consider these patches separately from the rest of the PCID stuff -- they barely interact, and this part is much simpler and is useful on its own. This is exactly identical to patches 2-4 of the PCID RFC series. Andy Lutomirski (3): x86/mm: Add INVPCID helpers x86/mm: Add a noinvpcid option to turn off INVPCID x86/mm: If INVPCID is available, use it to flush global mappings Documentation/kernel-parameters.txt | 2 ++ arch/x86/include/asm/tlbflush.h | 50 +++++++++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/common.c | 16 ++++++++++++ 3 files changed, 68 insertions(+) -- 2.5.0
