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- Substitute sbdrop_internal() with sbcut_internal(). The latter doesn't free

Browse source 
mbufs, but return chain of free mbufs to a caller. Caller can either reuse
  them or return to allocator in a batch manner.
- Implement sbdrop()/sbdrop_locked() as a wrapper around sbcut_internal().
- Expose sbcut_locked() for outside usage.

Sponsored by:	Netflix
Sponsored by:	Nginx, Inc.
Approved by:	re (marius)
This commit is contained in:
Gleb Smirnoff 2013-10-09 11:57:53 +00:00
parent f677a9e267
commit 1d2df300e9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=256185
2 changed files with 36 additions and 11 deletions
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45
sys/kern/uipc_sockbuf.c
View file

@ -65,7 +65,7 @@ u_long sb_max_adj =
static u_long sb_efficiency = 8; /* parameter for sbreserve() */
static void sbdrop_internal(struct sockbuf *sb, int len);
static struct mbuf *sbcut_internal(struct sockbuf *sb, int len);
static void sbflush_internal(struct sockbuf *sb);
/*
@ -818,7 +818,7 @@ sbflush_internal(struct sockbuf *sb)
*/
if (!sb->sb_cc && (sb->sb_mb == NULL || sb->sb_mb->m_len))
break;
sbdrop_internal(sb, (int)sb->sb_cc);
m_freem(sbcut_internal(sb, (int)sb->sb_cc));
}
if (sb->sb_cc || sb->sb_mb || sb->sb_mbcnt)
panic("sbflush_internal: cc %u || mb %p || mbcnt %u",
@ -843,15 +843,16 @@ sbflush(struct sockbuf *sb)
}
/*
* Drop data from (the front of) a sockbuf.
* Cut data from (the front of) a sockbuf.
*/
static void
sbdrop_internal(struct sockbuf *sb, int len)
static struct mbuf *
sbcut_internal(struct sockbuf *sb, int len)
{
struct mbuf *m;
struct mbuf *next;
struct mbuf *m, *n, *next, *mfree;
next = (m = sb->sb_mb) ? m->m_nextpkt : 0;
mfree = NULL;
while (len > 0) {
if (m == 0) {
if (next == 0)
@ -872,11 +873,17 @@ sbdrop_internal(struct sockbuf *sb, int len)
}
len -= m->m_len;
sbfree(sb, m);
m = m_free(m);
n = m->m_next;
m->m_next = mfree;
mfree = m;
m = n;
}
while (m && m->m_len == 0) {
sbfree(sb, m);
m = m_free(m);
n = m->m_next;
m->m_next = mfree;
mfree = m;
m = n;
}
if (m) {
sb->sb_mb = m;
@ -894,6 +901,8 @@ sbdrop_internal(struct sockbuf *sb, int len)
} else if (m->m_nextpkt == NULL) {
sb->sb_lastrecord = m;
}
return (mfree);
}
/*
@ -904,17 +913,31 @@ sbdrop_locked(struct sockbuf *sb, int len)
{
SOCKBUF_LOCK_ASSERT(sb);
m_freem(sbcut_internal(sb, len));
}
sbdrop_internal(sb, len);
/*
* Drop data from (the front of) a sockbuf,
* and return it to caller.
*/
struct mbuf *
sbcut_locked(struct sockbuf *sb, int len)
{
SOCKBUF_LOCK_ASSERT(sb);
return (sbcut_internal(sb, len));
}
void
sbdrop(struct sockbuf *sb, int len)
{
struct mbuf *mfree;
SOCKBUF_LOCK(sb);
sbdrop_locked(sb, len);
mfree = sbcut_internal(sb, len);
SOCKBUF_UNLOCK(sb);
m_freem(mfree);
}
/*

2
sys/sys/sockbuf.h
View file

@ -140,6 +140,8 @@ struct mbuf *
void sbdestroy(struct sockbuf *sb, struct socket *so);
void sbdrop(struct sockbuf *sb, int len);
void sbdrop_locked(struct sockbuf *sb, int len);
struct mbuf *
sbcut_locked(struct sockbuf *sb, int len);
void sbdroprecord(struct sockbuf *sb);
void sbdroprecord_locked(struct sockbuf *sb);
void sbflush(struct sockbuf *sb);