Move m_freem() from uipc_mbuf.c to subr_mbuf.c so it can take advantage

of the inlines, like its cousin, m_free().  Also, make a small (first
step?) optimisation of m_free() to use the MBP_PERSIST{,ENT} interface
to hold the lock across frees when possible.  The thing is that right
now, we can only do this easily for at most across one mbuf + one
cluster free, as the comment mentions (it also explains why).  Anyway,
some basic tests revealed a 5-10% overall improvement.  Some of the
results can be found here:
http://people.freebsd.org/~bmilekic/code/measure.txt

1 files changed, 0 insertions, 8 deletions

diff --git a/sys/kern/uipc_mbuf.c b/sys/kern/uipc_mbuf.c
index ea8f16d..2c74a4c 100644
--- a/sys/kern/uipc_mbuf.c
+++ b/sys/kern/uipc_mbuf.c
@@ -62,14 +62,6 @@ SYSCTL_INT(_kern_ipc, KIPC_MAX_HDR, max_hdr, CTLFLAG_RW, &max_hdr, 0, "");
 SYSCTL_INT(_kern_ipc, KIPC_MAX_DATALEN, max_datalen, CTLFLAG_RW,
 	   &max_datalen, 0, "");
 
-void
-m_freem(struct mbuf *m)
-{
-	while (m) {
-		m = m_free(m);
-	}
-}
-
 /*
  * Lesser-used path for M_PREPEND:
  * allocate new mbuf to prepend to chain,