[PATCH v3 0/3] mm: improve pte updates and dirty/accessed

Nicholas Piggin
2020-12-20T04:55:45Z

Time to get this old series out again. Since last time, Bibo found a
couple of the same cases I did (for MIPS only) which I extend to all
archs, and I dropped the "make the pte dirty if the fork parent was
dirty" due to Linus pointing out a dirty PTE costs more to unmap. It
didn't seem to help a great deal anyway on the access-side fortunately.

Thanks,
Nick

Nicholas Piggin (3):
mm/cow: don't bother write protecting already write-protected huge
pages
mm/cow: optimise pte accessed bit handling in fork
mm: optimise pte dirty/accessed bit setting by demand based pte
insertion

arch/mips/include/asm/pgtable.h | 2 --
include/linux/pgtable.h | 16 ----------------
mm/huge_memory.c | 16 ++++++++++------
mm/hugetlb.c | 2 +-
mm/memory.c | 15 +++++++--------
mm/migrate.c | 1 +
mm/shmem.c | 1 +
mm/userfaultfd.c | 2 +-
mm/vmscan.c | 5 +++++
9 files changed, 26 insertions(+), 34 deletions(-)

--
2.23.0