[PATCH 0/2] mm/mmap.c: reduce subtree gap propagation a little

From: Wei Yang
Date: Mon Aug 26 2019 - 03:31:44 EST

When insert and delete a vma, it will compute and propagate related subtree
gap. After some investigation, we can reduce subtree gap propagation a little.

[1]: This one reduce the propagation by update *next* gap after itself, since
*next* must be a parent in this case.
[2]: This one achieve this by unlinking vma from list.

After applying these two patches, test shows it reduce 0.4% function all for

Wei Yang (2):
mm/mmap.c: update *next* gap after itself
mm/mmap.c: unlink vma before rb_erase

mm/mmap.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)