freebsd-skq/usr.bin/netstat/mbuf.c

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/*
* Copyright (c) 1983, 1988, 1993
* The Regents of the University of California.
* Copyright (c) 2005 Robert N. M. Watson
* All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
#ifndef lint
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static char sccsid[] = "@(#)mbuf.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include <sys/param.h>
#include <sys/mbuf.h>
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#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
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#include <err.h>
#include <kvm.h>
#include <memstat.h>
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#include <stdio.h>
#include <stdlib.h>
Introduce numerous SMP friendly changes to the mbuf allocator. Namely, introduce a modified allocation mechanism for mbufs and mbuf clusters; one which can scale under SMP and which offers the possibility of resource reclamation to be implemented in the future. Notable advantages: o Reduce contention for SMP by offering per-CPU pools and locks. o Better use of data cache due to per-CPU pools. o Much less code cache pollution due to excessively large allocation macros. o Framework for `grouping' objects from same page together so as to be able to possibly free wired-down pages back to the system if they are no longer needed by the network stacks. Additional things changed with this addition: - Moved some mbuf specific declarations and initializations from sys/conf/param.c into mbuf-specific code where they belong. - m_getclr() has been renamed to m_get_clrd() because the old name is really confusing. m_getclr() HAS been preserved though and is defined to the new name. No tree sweep has been done "to change the interface," as the old name will continue to be supported and is not depracated. The change was merely done because m_getclr() sounds too much like "m_get a cluster." - TEMPORARILY disabled mbtypes statistics displaying in netstat(1) and systat(1) (see TODO below). - Fixed systat(1) to display number of "free mbufs" based on new per-CPU stat structures. - Fixed netstat(1) to display new per-CPU stats based on sysctl-exported per-CPU stat structures. All infos are fetched via sysctl. TODO (in order of priority): - Re-enable mbtypes statistics in both netstat(1) and systat(1) after introducing an SMP friendly way to collect the mbtypes stats under the already introduced per-CPU locks (i.e. hopefully don't use atomic() - it seems too costly for a mere stat update, especially when other locks are already present). - Optionally have systat(1) display not only "total free mbufs" but also "total free mbufs per CPU pool." - Fix minor length-fetching issues in netstat(1) related to recently re-enabled option to read mbuf stats from a core file. - Move reference counters at least for mbuf clusters into an unused portion of the cluster itself, to save space and need to allocate a counter. - Look into introducing resource freeing possibly from a kproc. Reviewed by (in parts): jlemon, jake, silby, terry Tested by: jlemon (Intel & Alpha), mjacob (Intel & Alpha) Preliminary performance measurements: jlemon (and me, obviously) URL: http://people.freebsd.org/~bmilekic/mb_alloc/
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#include <string.h>
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#include "netstat.h"
/*
* Print mbuf statistics.
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*/
void
mbpr(void *kvmd, u_long mbaddr)
{
struct memory_type_list *mtlp;
struct memory_type *mtp;
u_int64_t mbuf_count, mbuf_bytes, mbuf_free, mbuf_failures, mbuf_size;
u_int64_t cluster_count, cluster_bytes, cluster_limit, cluster_free;
u_int64_t cluster_failures, cluster_size;
u_int64_t packet_count, packet_bytes, packet_free, packet_failures;
u_int64_t tag_count, tag_bytes;
u_int64_t bytes_inuse, bytes_incache, bytes_total;
int nsfbufs, nsfbufspeak, nsfbufsused;
struct mbstat mbstat;
size_t mlen;
int error, live;
live = (kvmd == NULL);
mtlp = memstat_mtl_alloc();
if (mtlp == NULL) {
warn("memstat_mtl_alloc");
return;
}
/*
* Use memstat_*_all() because some mbuf-related memory is in uma(9),
* and some malloc(9).
*/
if (live) {
if (memstat_sysctl_all(mtlp, 0) < 0) {
warnx("memstat_sysctl_all: %s",
memstat_strerror(memstat_mtl_geterror(mtlp)));
goto out;
}
} else {
if (memstat_kvm_all(mtlp, kvmd) < 0) {
error = memstat_mtl_geterror(mtlp);
if (error == MEMSTAT_ERROR_KVM)
warnx("memstat_kvm_all: %s",
kvm_geterr(kvmd));
else
warnx("memstat_kvm_all: %s",
memstat_strerror(error));
goto out;
}
}
mtp = memstat_mtl_find(mtlp, ALLOCATOR_UMA, MBUF_MEM_NAME);
if (mtp == NULL) {
warnx("memstat_mtl_find: zone %s not found", MBUF_MEM_NAME);
goto out;
}
mbuf_count = memstat_get_count(mtp);
mbuf_bytes = memstat_get_bytes(mtp);
mbuf_free = memstat_get_free(mtp);
mbuf_failures = memstat_get_failures(mtp);
mbuf_size = memstat_get_size(mtp);
mtp = memstat_mtl_find(mtlp, ALLOCATOR_UMA, MBUF_PACKET_MEM_NAME);
if (mtp == NULL) {
warnx("memstat_mtl_find: zone %s not found",
MBUF_PACKET_MEM_NAME);
goto out;
}
packet_count = memstat_get_count(mtp);
packet_bytes = memstat_get_bytes(mtp);
packet_free = memstat_get_free(mtp);
packet_failures = memstat_get_failures(mtp);
mtp = memstat_mtl_find(mtlp, ALLOCATOR_UMA, MBUF_CLUSTER_MEM_NAME);
if (mtp == NULL) {
warnx("memstat_mtl_find: zone %s not found",
MBUF_CLUSTER_MEM_NAME);
goto out;
}
cluster_count = memstat_get_count(mtp);
cluster_bytes = memstat_get_bytes(mtp);
cluster_limit = memstat_get_countlimit(mtp);
cluster_free = memstat_get_free(mtp);
cluster_failures = memstat_get_failures(mtp);
cluster_size = memstat_get_size(mtp);
mtp = memstat_mtl_find(mtlp, ALLOCATOR_MALLOC, MBUF_TAG_MEM_NAME);
if (mtp == NULL) {
warnx("memstat_mtl_find: malloc type %s not found",
MBUF_TAG_MEM_NAME);
goto out;
}
tag_count = memstat_get_count(mtp);
tag_bytes = memstat_get_bytes(mtp);
printf("%llu/%llu/%llu mbufs in use (current/cache/total)\n",
mbuf_count + packet_count, mbuf_free + packet_free,
mbuf_count + packet_count + mbuf_free + packet_free);
printf("%llu/%llu/%llu/%llu mbuf clusters in use "
"(current/cache/total/max)\n",
cluster_count - packet_free, cluster_free + packet_free,
cluster_count + cluster_free, cluster_limit);
#if 0
printf("%llu mbuf tags in use\n", tag_count);
#endif
if (live) {
mlen = sizeof(nsfbufs);
if (!sysctlbyname("kern.ipc.nsfbufs", &nsfbufs, &mlen, NULL,
0) &&
!sysctlbyname("kern.ipc.nsfbufsused", &nsfbufsused,
&mlen, NULL, 0) &&
!sysctlbyname("kern.ipc.nsfbufspeak", &nsfbufspeak,
&mlen, NULL, 0)) {
printf("%d/%d/%d sfbufs in use (current/peak/max)\n",
nsfbufsused, nsfbufspeak, nsfbufs);
}
}
/*-
* Calculate in-use bytes as:
* - straight mbuf memory
* - mbuf memory in packets
* - the clusters attached to packets
* - and the rest of the non-packet-attached clusters.
* - m_tag memory
* This avoids counting the clusters attached to packets in the cache.
* This currently excludes sf_buf space.
*/
bytes_inuse =
mbuf_bytes + /* straight mbuf memory */
packet_bytes + /* mbufs in packets */
(packet_count * cluster_size) + /* clusters in packets */
/* other clusters */
((cluster_count - packet_count - packet_free) * cluster_size) +
tag_bytes;
/*
* Calculate in-cache bytes as:
* - cached straught mbufs
* - cached packet mbufs
* - cached packet clusters
* - cached straight clusters
* This currently excludes sf_buf space.
*/
bytes_incache =
(mbuf_free * mbuf_size) + /* straight free mbufs */
(packet_free * mbuf_size) + /* mbufs in free packets */
(packet_free * cluster_size) + /* clusters in free packets */
(cluster_free * cluster_size); /* free clusters */
/*
* Total is bytes in use + bytes in cache. This doesn't take into
* account various other misc data structures, overhead, etc, but
* gives the user something useful despite that.
*/
bytes_total = bytes_inuse + bytes_incache;
printf("%lluK/%lluK/%lluK bytes allocated to network "
"(current/cache/total)\n", bytes_inuse / 1024,
bytes_incache / 1024, bytes_total / 1024);
printf("%llu/%llu/%llu requests for mbufs denied (mbufs/clusters/"
"mbuf+clusters)\n", mbuf_failures, cluster_failures,
packet_failures);
if (live) {
mlen = sizeof(mbstat);
if (sysctlbyname("kern.ipc.mbstat", &mbstat, &mlen, NULL, 0)) {
warn("kern.ipc.mbstat");
goto out;
}
} else {
if (kread(mbaddr, (char *)&mbstat, sizeof mbstat))
goto out;
}
printf("%lu requests for sfbufs denied\n", mbstat.sf_allocfail);
printf("%lu requests for sfbufs delayed\n", mbstat.sf_allocwait);
printf("%lu requests for I/O initiated by sendfile\n",
mbstat.sf_iocnt);
printf("%lu calls to protocol drain routines\n", mbstat.m_drain);
out:
memstat_mtl_free(mtlp);
}