mirror of
https://git.FreeBSD.org/src.git
synced 2025-01-02 12:20:51 +00:00
Use more fine-grained kvm(3) symbol lookup: routing code retrieves only
necessary symbols needed per subsystem. Main kvm(3) init is now delayed as much as possbile. This finally fixes performance issues reported in kern/167204. Some non-working code (ng_socket.ko symbol addresses calculation) removed. Some global variables eliminated. PR: kern/167204 MFC after: 4 weeks
This commit is contained in:
Alexander V. Chernikov
parent
851d84f1b5
commit
fc47e028bb
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=259638
@ -223,7 +223,7 @@ next_ifma(struct ifmaddrs *ifma, const char *name, const sa_family_t family)
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* Print a description of the network interfaces.
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*/
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void
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intpr(int interval, void (*pfunc)(char *))
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intpr(int interval, void (*pfunc)(char *), int af)
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{
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struct ifaddrs *ifap, *ifa;
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struct ifmaddrs *ifmap, *ifma;
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@ -319,7 +319,6 @@ int gflag; /* show group (multicast) routing or stats */
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int hflag; /* show counters in human readable format */
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int iflag; /* show interfaces */
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int Lflag; /* show size of listen queues */
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int Mflag; /* read statistics from core */
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int mflag; /* show memory stats */
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int noutputs = 0; /* how much outputs before we exit */
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int numeric_addr; /* show addresses numerically */
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@ -425,7 +424,6 @@ main(int argc, char *argv[])
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Lflag = 1;
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break;
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case 'M':
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Mflag = 1;
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memf = optarg;
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break;
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case 'm':
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@ -554,40 +552,40 @@ main(int argc, char *argv[])
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* used for the queries, which is slower.
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*/
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#endif
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kread(0, NULL, 0);
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if (iflag && !sflag) {
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intpr(interval, NULL);
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intpr(interval, NULL, af);
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exit(0);
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}
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if (rflag) {
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if (sflag)
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rt_stats(nl[N_RTSTAT].n_value, nl[N_RTTRASH].n_value);
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rt_stats();
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else
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routepr(nl[N_RTREE].n_value, fib);
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routepr(fib, af);
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exit(0);
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}
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if (gflag) {
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if (sflag) {
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if (af == AF_INET || af == AF_UNSPEC)
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mrt_stats(nl[N_MRTSTAT].n_value);
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mrt_stats();
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#ifdef INET6
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if (af == AF_INET6 || af == AF_UNSPEC)
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mrt6_stats(nl[N_MRT6STAT].n_value);
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mrt6_stats();
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#endif
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} else {
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if (af == AF_INET || af == AF_UNSPEC)
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mroutepr(nl[N_MFCHASHTBL].n_value,
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nl[N_MFCTABLESIZE].n_value,
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nl[N_VIFTABLE].n_value);
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mroutepr();
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#ifdef INET6
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if (af == AF_INET6 || af == AF_UNSPEC)
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mroute6pr(nl[N_MF6CTABLE].n_value,
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nl[N_MIF6TABLE].n_value);
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mroute6pr();
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#endif
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}
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exit(0);
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}
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/* Load all necessary kvm symbols */
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kresolve_list(nl);
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if (tp) {
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printproto(tp, tp->pr_name);
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exit(0);
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@ -640,7 +638,7 @@ printproto(struct protox *tp, const char *name)
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if (sflag) {
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if (iflag) {
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if (tp->pr_istats)
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intpr(interval, tp->pr_istats);
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intpr(interval, tp->pr_istats, af);
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else if (pflag)
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printf("%s: no per-interface stats routine\n",
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tp->pr_name);
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@ -703,7 +701,23 @@ kvmd_init(void)
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return (-1);
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}
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if (kvm_nlist(kvmd, nl) < 0) {
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return (0);
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}
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/*
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* Resolve symbol list, return 0 on success.
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*/
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int
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kresolve_list(struct nlist *_nl)
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{
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if ((kvmd == NULL) && (kvmd_init() != 0))
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return (-1);
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if (_nl[0].n_type != 0)
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return (0);
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if (kvm_nlist(kvmd, _nl) < 0) {
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if (nlistf)
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errx(1, "%s: kvm_nlist: %s", nlistf,
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kvm_geterr(kvmd));
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@ -711,13 +725,6 @@ kvmd_init(void)
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errx(1, "kvm_nlist: %s", kvm_geterr(kvmd));
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}
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if (nl[0].n_type == 0) {
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if (nlistf)
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errx(1, "%s: no namelist", nlistf);
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else
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errx(1, "no namelist");
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}
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return (0);
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}
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@ -65,11 +65,26 @@ __FBSDID("$FreeBSD$");
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#undef _KERNEL
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#include <err.h>
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#include <nlist.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "netstat.h"
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/*
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* kvm(3) bindings for every needed symbol
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*/
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static struct nlist mrl[] = {
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#define N_MRTSTAT 0
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{ .n_name = "_mrtstat" },
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#define N_MFCHASHTBL 1
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{ .n_name = "_mfchashtbl" },
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#define N_VIFTABLE 2
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{ .n_name = "_viftable" },
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#define N_MFCTABLESIZE 3
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{ .n_name = "_mfctablesize" },
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{ .n_name = NULL },
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};
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static void print_bw_meter(struct bw_meter *, int *);
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static void print_mfc(struct mfc *, int, int *);
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@ -193,11 +208,12 @@ print_mfc(struct mfc *m, int maxvif, int *banner_printed)
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}
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void
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mroutepr(u_long pmfchashtbl, u_long pmfctablesize, u_long pviftbl)
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mroutepr()
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{
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struct vif viftable[MAXVIFS];
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struct vif *v;
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struct mfc *m;
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u_long pmfchashtbl, pmfctablesize, pviftbl;
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int banner_printed;
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int saved_numeric_addr;
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size_t len;
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@ -221,6 +237,16 @@ mroutepr(u_long pmfchashtbl, u_long pmfctablesize, u_long pviftbl)
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*/
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maxvif = 0;
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kresolve_list(mrl);
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pmfchashtbl = mrl[N_MFCHASHTBL].n_value;
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pmfctablesize = mrl[N_MFCTABLESIZE].n_value;
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pviftbl = mrl[N_VIFTABLE].n_value;
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if (pmfchashtbl == 0 || pmfctablesize == 0 || pviftbl == 0) {
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fprintf(stderr, "No IPv4 MROUTING kernel support.\n");
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return;
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}
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len = sizeof(viftable);
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if (live) {
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if (sysctlbyname("net.inet.ip.viftable", viftable, &len, NULL,
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@ -338,15 +364,24 @@ mroutepr(u_long pmfchashtbl, u_long pmfctablesize, u_long pviftbl)
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}
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void
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mrt_stats(u_long mstaddr)
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mrt_stats()
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{
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struct mrtstat mrtstat;
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size_t len = sizeof mrtstat;
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u_long mstaddr;
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size_t len = sizeof(mrtstat);
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kresolve_list(mrl);
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mstaddr = mrl[N_MRTSTAT].n_value;
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if (mstaddr == 0) {
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fprintf(stderr, "No IPv4 MROUTING kernel support.\n");
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return;
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}
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if (live) {
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if (sysctlbyname("net.inet.ip.mrtstat", &mrtstat, &len, NULL,
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0) < 0) {
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warn("sysctl: net.inet.ip.mrtstat");
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warn("sysctl: net.inet.ip.mrtstat failed.");
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return;
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}
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} else
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@ -85,6 +85,7 @@ __FBSDID("$FreeBSD$");
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#include <netinet/in.h>
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#include <err.h>
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#include <nlist.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -95,17 +96,32 @@ __FBSDID("$FreeBSD$");
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#include "netstat.h"
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/*
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* kvm(3) bindings for every needed symbol
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*/
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static struct nlist mrl[] = {
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#define N_MF6CTABLE 0
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{ .n_name = "_mf6ctable" },
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#define N_MIF6TABLE 1
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{ .n_name = "_mif6table" },
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#define N_MRT6STAT 2
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{ .n_name = "_mrt6stat" },
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{ .n_name = NULL },
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};
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#define WID_ORG (Wflag ? 39 : (numeric_addr ? 29 : 18)) /* width of origin column */
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#define WID_GRP (Wflag ? 18 : (numeric_addr ? 16 : 18)) /* width of group column */
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void
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mroute6pr(u_long mfcaddr, u_long mifaddr)
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mroute6pr()
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{
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struct mf6c *mf6ctable[MF6CTBLSIZ], *mfcp;
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struct mif6 mif6table[MAXMIFS];
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struct mf6c mfc;
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struct rtdetq rte, *rtep;
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struct mif6 *mifp;
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u_long mfcaddr, mifaddr;
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mifi_t mifi;
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int i;
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int banner_printed;
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@ -114,6 +130,15 @@ mroute6pr(u_long mfcaddr, u_long mifaddr)
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long int waitings;
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size_t len;
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kresolve_list(mrl);
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mfcaddr = mrl[N_MF6CTABLE].n_value;
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mifaddr = mrl[N_MIF6TABLE].n_value;
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if (mfcaddr == 0 || mifaddr == 0) {
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fprintf(stderr, "No IPv6 MROUTING kernel support.\n");
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return;
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}
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len = sizeof(mif6table);
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if (live) {
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if (sysctlbyname("net.inet6.ip6.mif6table", mif6table, &len,
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@ -217,11 +242,20 @@ mroute6pr(u_long mfcaddr, u_long mifaddr)
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}
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void
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mrt6_stats(u_long mstaddr)
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mrt6_stats()
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{
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struct mrt6stat mrtstat;
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u_long mstaddr;
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size_t len = sizeof mrtstat;
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kresolve_list(mrl);
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mstaddr = mrl[N_MRT6STAT].n_value;
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if (mstaddr == 0) {
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fprintf(stderr, "No IPv6 MROUTING kernel support.\n");
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return;
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}
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if (live) {
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if (sysctlbyname("net.inet6.ip6.mrt6stat", &mrtstat, &len,
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NULL, 0) < 0) {
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@ -72,53 +72,10 @@ netgraphprotopr(u_long off, const char *name, int af1 __unused,
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/* If symbol not found, try looking in the KLD module */
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if (off == 0) {
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const char *const modname = "ng_socket.ko";
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/* XXX We should get "mpath" from "sysctl kern.module_path" */
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const char *mpath[] = { "/", "/boot/", "/modules/", NULL };
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struct nlist sym[] = { { .n_name = "_ngsocklist" },
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{ .n_name = NULL } };
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const char **pre;
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struct kld_file_stat ks;
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int fileid;
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/* Can't do this for core dumps. */
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if (!live)
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return;
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/* See if module is loaded */
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if ((fileid = kldfind(modname)) < 0) {
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if (debug)
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warn("kldfind(%s)", modname);
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return;
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}
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/* Get module info */
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memset(&ks, 0, sizeof(ks));
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ks.version = sizeof(struct kld_file_stat);
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if (kldstat(fileid, &ks) < 0) {
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if (debug)
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warn("kldstat(%d)", fileid);
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return;
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}
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/* Get symbol table from module file */
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for (pre = mpath; *pre; pre++) {
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char path[MAXPATHLEN];
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snprintf(path, sizeof(path), "%s%s", *pre, modname);
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if (nlist(path, sym) == 0)
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break;
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}
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/* Did we find it? */
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if (sym[0].n_value == 0) {
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if (debug)
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warnx("%s not found", modname);
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return;
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}
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/* Symbol found at load address plus symbol offset */
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off = (u_long) ks.address + sym[0].n_value;
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if (debug)
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fprintf(stderr,
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"Error reading symbols from ng_socket.ko");
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return;
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}
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/* Get pointer to first socket */
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@ -40,7 +40,6 @@ extern int gflag; /* show group (multicast) routing or stats */
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extern int hflag; /* show counters in human readable format */
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extern int iflag; /* show interfaces */
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extern int Lflag; /* show size of listen queues */
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extern int Mflag; /* read statistics from core */
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extern int mflag; /* show memory stats */
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extern int noutputs; /* how much outputs before we exit */
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extern int numeric_addr; /* show addresses numerically */
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@ -57,11 +56,12 @@ extern int interval; /* repeat interval for i/f stats */
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extern char *interface; /* desired i/f for stats, or NULL for all i/fs */
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extern int unit; /* unit number for above */
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extern int af; /* address family */
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extern int live; /* true if we are examining a live system */
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struct nlist;
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int kread(u_long addr, void *buf, size_t size);
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int kread_counters(u_long addr, void *buf, size_t size);
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int kresolve_list(struct nlist *);
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const char *plural(uintmax_t);
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const char *plurales(uintmax_t);
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const char *pluralies(uintmax_t);
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@ -98,8 +98,8 @@ void icmp6_stats(u_long, const char *, int, int);
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void icmp6_ifstats(char *);
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void pim6_stats(u_long, const char *, int, int);
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void rip6_stats(u_long, const char *, int, int);
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void mroute6pr(u_long, u_long);
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void mrt6_stats(u_long);
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void mroute6pr(void);
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void mrt6_stats(void);
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struct sockaddr_in6;
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struct in6_addr;
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@ -120,11 +120,11 @@ void netisr_stats(void *);
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void hostpr(u_long, u_long);
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void impstats(u_long, u_long);
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void intpr(int, void (*)(char *));
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void intpr(int, void (*)(char *), int);
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void pr_rthdr(int);
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void pr_family(int);
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void rt_stats(u_long, u_long);
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void rt_stats(void);
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char *ipx_pnet(struct sockaddr *);
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char *ipx_phost(struct sockaddr *);
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char *ns_phost(struct sockaddr *);
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@ -136,7 +136,7 @@ char *atalk_print(struct sockaddr *, int);
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char *atalk_print2(struct sockaddr *, struct sockaddr *, int);
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char *ipx_print(struct sockaddr *);
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char *ns_print(struct sockaddr *);
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void routepr(u_long, int);
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void routepr(int, int);
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void ipxprotopr(u_long, const char *, int, int);
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void spx_stats(u_long, const char *, int, int);
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@ -166,6 +166,6 @@ void tp_protopr(u_long, const char *, int, int);
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void tp_inproto(u_long);
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void tp_stats(caddr_t, caddr_t);
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void mroutepr(u_long, u_long, u_long);
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void mrt_stats(u_long);
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void mroutepr(void);
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void mrt_stats(void);
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void bpf_stats(char *);
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@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
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#include <ifaddrs.h>
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#include <libutil.h>
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#include <netdb.h>
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#include <nlist.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -106,6 +107,19 @@ struct bits {
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{ 0 , 0 }
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};
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|
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/*
|
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* kvm(3) bindings for every needed symbol
|
||||
*/
|
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static struct nlist rl[] = {
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#define N_RTSTAT 0
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{ .n_name = "_rtstat" },
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#define N_RTREE 1
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{ .n_name = "_rt_tables"},
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#define N_RTTRASH 2
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{ .n_name = "_rttrash" },
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{ .n_name = NULL },
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};
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|
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typedef union {
|
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long dummy; /* Helps align structure. */
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struct sockaddr u_sa;
|
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@ -151,9 +165,10 @@ static void domask(char *, in_addr_t, u_long);
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* Print routing tables.
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*/
|
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void
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routepr(u_long rtree, int fibnum)
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routepr(int fibnum, int af)
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{
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struct radix_node_head **rnhp, *rnh, head;
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u_long rtree;
|
||||
size_t intsize;
|
||||
int fam, numfibs;
|
||||
|
||||
@ -165,10 +180,6 @@ routepr(u_long rtree, int fibnum)
|
||||
numfibs = 1;
|
||||
if (fibnum < 0 || fibnum > numfibs - 1)
|
||||
errx(EX_USAGE, "%d: invalid fib", fibnum);
|
||||
rt_tables = calloc(numfibs * (AF_MAX+1),
|
||||
sizeof(struct radix_node_head *));
|
||||
if (rt_tables == NULL)
|
||||
err(EX_OSERR, "memory allocation failed");
|
||||
/*
|
||||
* Since kernel & userland use different timebase
|
||||
* (time_uptime vs time_second) and we are reading kernel memory
|
||||
@ -182,14 +193,20 @@ routepr(u_long rtree, int fibnum)
|
||||
printf(" (fib: %d)", fibnum);
|
||||
printf("\n");
|
||||
|
||||
if (Aflag == 0 && Mflag == 0 && NewTree)
|
||||
if (Aflag == 0 && live != 0 && NewTree)
|
||||
ntreestuff(fibnum, af);
|
||||
else {
|
||||
if (rtree == 0) {
|
||||
kresolve_list(rl);
|
||||
if ((rtree = rl[N_RTREE].n_value) == 0) {
|
||||
printf("rt_tables: symbol not in namelist\n");
|
||||
return;
|
||||
}
|
||||
|
||||
rt_tables = calloc(numfibs * (AF_MAX + 1),
|
||||
sizeof(struct radix_node_head *));
|
||||
if (rt_tables == NULL)
|
||||
err(EX_OSERR, "memory allocation failed");
|
||||
|
||||
if (kread((u_long)(rtree), (char *)(rt_tables), (numfibs *
|
||||
(AF_MAX+1) * sizeof(struct radix_node_head *))) != 0)
|
||||
return;
|
||||
@ -572,14 +589,14 @@ ntreestuff(int fibnum, int af)
|
||||
mib[5] = 0;
|
||||
mib[6] = fibnum;
|
||||
if (sysctl(mib, 7, NULL, &needed, NULL, 0) < 0) {
|
||||
err(1, "sysctl: net.route.0.0.dump estimate");
|
||||
err(1, "sysctl: net.route.0.%d.dump.%d estimate", af, fibnum);
|
||||
}
|
||||
|
||||
if ((buf = malloc(needed)) == 0) {
|
||||
errx(2, "malloc(%lu)", (unsigned long)needed);
|
||||
}
|
||||
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
|
||||
err(1, "sysctl: net.route.0.0.dump");
|
||||
err(1, "sysctl: net.route.0.%d.dump.%d", af, fibnum);
|
||||
}
|
||||
lim = buf + needed;
|
||||
for (next = buf; next < lim; next += rtm->rtm_msglen) {
|
||||
@ -1071,16 +1088,19 @@ routename6(struct sockaddr_in6 *sa6)
|
||||
* Print routing statistics
|
||||
*/
|
||||
void
|
||||
rt_stats(u_long rtsaddr, u_long rttaddr)
|
||||
rt_stats(void)
|
||||
{
|
||||
struct rtstat rtstat;
|
||||
u_long rtsaddr, rttaddr;
|
||||
int rttrash;
|
||||
|
||||
if (rtsaddr == 0) {
|
||||
kresolve_list(rl);
|
||||
|
||||
if ((rtsaddr = rl[N_RTSTAT].n_value) == 0) {
|
||||
printf("rtstat: symbol not in namelist\n");
|
||||
return;
|
||||
}
|
||||
if (rttaddr == 0) {
|
||||
if ((rttaddr = rl[N_RTTRASH].n_value) == 0) {
|
||||
printf("rttrash: symbol not in namelist\n");
|
||||
return;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user