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

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Message-ID: <20191223030538.GA31929@richard>
Date:   Mon, 23 Dec 2019 11:05:38 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     Wei Yang <richardw.yang@...ux.intel.com>
Cc:     akpm@...ux-foundation.org, vbabka@...e.cz,
        kirill.shutemov@...ux.intel.com, yang.shi@...ux.alibaba.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND [PATCH] 0/2] mm/mmap.c: reduce subtree gap propagation a
 little

Any other comments for these two?

On Wed, Aug 28, 2019 at 02:06:12PM +0800, Wei Yang wrote:
>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

-- 
Wei Yang
Help you, Help me