[PATCH 0/3] KSMscale cleanup/optimizations

[Andrea Arcangeli <aarcange@redhat.com>]

Hello,

This is incremental with the two fixes already in -mm.

There are no fixes here it's just minor cleanups and optimizations.

1/3 removes makes the "fix" for the stale stable_node fall in the
standard case without introducing new cases. Setting stable_node to
NULL was marginally safer, but stale pointer is still wiped from the
caller, this looks cleaner.

2/3 should fix the false positive from Dan's static checker. Dan could
you check if it still complains?

3/3 is a microoptimization to apply the the refile of future merge
candidate dups at the head of the chain in all cases and to skip it in
one case where we did it and but it was a noop (to avoid checking if
it was already at the head but now we've to check it anyway so it got
optimized away).

Andrea Arcangeli (3):
  ksm: cleanup stable_node chain collapse case
  ksm: swap the two output parameters of chain/chain_prune
  ksm: optimize refile of stable_node_dup at the head of the chain

 mm/ksm.c | 163 ++++++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 103 insertions(+), 60 deletions(-)

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