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

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Date:   Wed, 28 Aug 2019 14:06:12 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     akpm@...ux-foundation.org, vbabka@...e.cz,
        kirill.shutemov@...ux.intel.com, yang.shi@...ux.alibaba.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: [RESEND [PATCH] 0/2] mm/mmap.c: reduce subtree gap propagation a little

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 0.3% function call for
vma_compute_subtree_gap.

BTW, this series is based on some un-merged cleanup patched.

---
This version is rebased on current linus tree, whose last commit is
commit 9e8312f5e160 ("Merge tag 'nfs-for-5.3-3' of
git://git.linux-nfs.org/projects/trondmy/linux-nfs").

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(-)

-- 
2.17.1