[0/3] mm: dirty/accessed pte optimisations

Message

Nicholas Piggin Aug. 28, 2018, 11:20 a.m. UTC

Here are some patches that didn't get much comment last time. It
looks like x86 might benefit too though, so that might get people
interested. 

I improved changelogs and added some comments, but no real logic
changes.

I hope I didn't get the x86 numbers wrong, they're more significant
than I expected so it could quite well be a problem with my test
(corrections welcome). Any data from other archs would be interesting
too.

Andrew perhaps if there aren't objections these could go in mm for
a while. 

Thanks,
Nick


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

 mm/huge_memory.c | 24 +++++++++++++++---------
 mm/memory.c      | 18 ++++++++++--------
 mm/vmscan.c      |  8 ++++++++
 3 files changed, 33 insertions(+), 17 deletions(-)