Date: Thu, 2 Jan 2003 13:16:50 -0800 (PST) From: Andrew Gallatin <gallatin@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern subr_mbuf.c src/sys/sys mbuf.h Message-ID: <200301022116.h02LGo2N033186@repoman.freebsd.org>
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gallatin 2003/01/02 13:16:50 PST
Modified files:
sys/kern subr_mbuf.c
sys/sys mbuf.h
Log:
o Introduce a new external mbuf type, EXT_EXTREF.
o Allow callers of m_extadd() to allocate their own reference
m_ext.ref_cnt pointer, rather than having the mbuf system allocate it
with a malloc() in the critical path. This speeds m_extadd() up, and
also simplifies locking (malloc() may need Giant).
A driver or subsystem wishing to take use its own ref counter must
initialize m_ext.ref_cnt to point to its ref counter prior to
calling m_extadd(), and it must use EXT_EXTREF as its external type.
Eg:
m->m_ext.ref_cnt = my_ref_cnt_ptr;
m_extadd(.....,EXT_EXTREF);
Reviewed by: bosko
Revision Changes Path
1.35 +8 -3 src/sys/kern/subr_mbuf.c
1.110 +1 -0 src/sys/sys/mbuf.h
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