git: staged mbuf(9): Improve m_copyback2() to use the trailing space

[Aaron LI]

commit 10ab128c99d4c602bcf5e5a521f3cb30288ff8e1
Author: Aaron LI <aly at aaronly.me>
Date:   Fri Dec 22 14:34:50 2023 +0800

    mbuf(9): Improve m_copyback2() to use the trailing space
    
    Make use of the trailing space of the last mbuf if available, both in
    skipping the offset and in copying back the data.
    
    As a side benefit of this change, the 'm0->m_len' field no longer needs
    to be initialized and can simply be 0, as in a newly allocated mbuf.
    
    Referred to both OpenBSD and FreeBSD; however, they only try to use the
    trailing space in copying the data.

Summary of changes:
 sys/kern/uipc_mbuf.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/10ab128c99d4c602bcf5e5a521f3cb30288ff8e1


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