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Add a systemtap script for watching QEMU monitor interactions
This change adds some systemtap/dtrace probes to the QEMU monitor client code. In particular it allows watching of all operations for a VM * examples/systemtap/qemu-monitor.stp: Watch all monitor commands * src/Makefile.am: Passing libdir/bindir/sbindir to dtrace2systemtap.pl * src/dtrace2systemtap.pl: Accept libdir/bindir/sbindir as args and look for '# binary:' comment to mark probes against libvirtd vs libvirt.so * src/qemu/qemu_monitor.c, src/qemu/qemu_monitor_json.c, src/qemu/qemu_monitor_text.c: Add probes for key functions
This commit is contained in:
Daniel P. Berrange
parent
95d3b4de71
commit
9b76b08ae4
80
examples/systemtap/qemu-monitor.stp
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80
examples/systemtap/qemu-monitor.stp
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@ -0,0 +1,80 @@
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#!/usr/bin/stap
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#
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# Copyright (C) 2011 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Author: Daniel P. Berrange <berrange@redhat.com>
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#
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# This script will monitor all messages sent/received between libvirt
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# and the QEMU monitor
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#
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# stap qemu-monitor.stp
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# 0.000 begin
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# 3.848 ! 0x7f2dc00017b0 {"timestamp": {"seconds": 1319466931, "microseconds": 187755}, "event": "SHUTDOWN"}
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# 5.773 > 0x7f2dc0007960 {"execute":"qmp_capabilities","id":"libvirt-1"}
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# 5.774 < 0x7f2dc0007960 {"return": {}, "id": "libvirt-1"}
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# 5.774 > 0x7f2dc0007960 {"execute":"query-commands","id":"libvirt-2"}
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# 5.777 < 0x7f2dc0007960 {"return": [{"name": "quit"}, {"name": ....snip....
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# 5.777 > 0x7f2dc0007960 {"execute":"query-chardev","id":"libvirt-3"}
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# 5.778 < 0x7f2dc0007960 {"return": [{"filename": ....snip....
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# 5.779 > 0x7f2dc0007960 {"execute":"query-cpus","id":"libvirt-4"}
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# 5.780 < 0x7f2dc0007960 {"return": [{"current": true, "CPU": 0, "pc": 1048560, "halted": false, "thread_id": 13299}], "id": "libvirt-4"}
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# 5.780 > 0x7f2dc0007960 {"execute":"set_password","arguments":{"protocol":"vnc","password":"123456","connected":"keep"},"id":"libvirt-5"}
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# 5.782 < 0x7f2dc0007960 {"return": {}, "id": "libvirt-5"}
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# 5.782 > 0x7f2dc0007960 {"execute":"expire_password","arguments":{"protocol":"vnc","time":"never"},"id":"libvirt-6"}
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# 5.783 < 0x7f2dc0007960 {"return": {}, "id": "libvirt-6"}
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# 5.783 > 0x7f2dc0007960 {"execute":"balloon","arguments":{"value":224395264},"id":"libvirt-7"}
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# 5.785 < 0x7f2dc0007960 {"return": {}, "id": "libvirt-7"}
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# 5.785 > 0x7f2dc0007960 {"execute":"cont","id":"libvirt-8"}
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# 5.789 ! 0x7f2dc0007960 {"timestamp": {"seconds": 1319466933, "microseconds": 129980}, "event": "RESUME"}
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# 5.789 < 0x7f2dc0007960 {"return": {}, "id": "libvirt-8"}
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# 7.537 ! 0x7f2dc0007960 {"timestamp": {"seconds": 1319466934, "microseconds": 881214}, "event": "SHUTDOWN"}
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#
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global start
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# Print a string, with a timestamp relative to the start of the script
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function print_ts(msg)
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{
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now = gettimeofday_ns() / (1000*1000)
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delta = (now - start)
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printf("%3d.%03d %s\n", (delta / 1000), (delta % 1000), msg);
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}
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# Just so we know the script is now running
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probe begin {
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start = gettimeofday_ns() / (1000*1000)
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print_ts("begin")
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}
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probe libvirt.qemu.monitor_send_msg {
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if (fd != -1) {
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print_ts(sprintf("> %p %s (fd=%d)", mon, substr(msg, 0, strlen(msg)-2), fd));
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} else {
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print_ts(sprintf("> %p %s", mon, substr(msg, 0, strlen(msg)-2)));
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}
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}
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probe libvirt.qemu.monitor_recv_reply {
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print_ts(sprintf("< %p %s", mon, reply));
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}
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probe libvirt.qemu.monitor_recv_event {
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print_ts(sprintf("! %p %s", mon, event));
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}
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@ -1288,7 +1288,7 @@ libvirt_functions.stp: $(RPC_PROBE_FILES) $(srcdir)/rpc/gensystemtap.pl
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$(AM_V_GEN)perl -w $(srcdir)/rpc/gensystemtap.pl $(RPC_PROBE_FILES) > $@
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libvirt_probes.stp: probes.d $(srcdir)/dtrace2systemtap.pl
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$(AM_V_GEN)perl -w $(srcdir)/dtrace2systemtap.pl $< > $@
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$(AM_V_GEN)perl -w $(srcdir)/dtrace2systemtap.pl $(bindir) $(sbindir) $(libdir) $< > $@
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CLEANFILES += probes.h probes.o libvirt_functions.stp libvirt_probes.stp
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endif
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@ -31,6 +31,10 @@ my $file;
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my @files;
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my %files;
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my $bindir = shift @ARGV;
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my $sbindir = shift @ARGV;
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my $libdir = shift @ARGV;
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my $probe;
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my $args;
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@ -41,12 +45,18 @@ while (<>) {
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next if /^\s*provider\s+\w+\s*{\s*$/;
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next if /^\s*};\s*$/;
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if (m,^\s*\#\s*file:\s*(\S+)\s*$,) {
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$file = $1;
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push @files, $file;
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$files{$file} = { prefix => undef, probes => [] };
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} elsif (m,^\s*\#\s*prefix:\s*(\S+)\s*$,) {
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$files{$file}->{prefix} = $1;
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if (m,^\s*\#,) {
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if (m,^\s*\#\s*file:\s*(\S+)\s*$,) {
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$file = $1;
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push @files, $file;
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$files{$file} = { prefix => undef, probes => [] };
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} elsif (m,^\s*\#\s*prefix:\s*(\S+)\s*$,) {
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$files{$file}->{prefix} = $1;
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} elsif (m,^\s*\#\s*binary:\s*(\S+)\s*$,) {
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$files{$file}->{binary} = $1;
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} else {
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# ignore unknown comments
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}
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} else {
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if (m,\s*probe\s+([a-zA-Z0-9_]+)\((.*?)(\);)?$,) {
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$probe = $1;
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@ -84,7 +94,12 @@ foreach my $file (@files) {
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my $pname = $name;
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$pname =~ s/${prefix}_/libvirt.$prefix./;
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print "probe $pname = process(\"libvirt.so\").mark(\"$name\") {\n";
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my $binary = "$libdir/libvirt.so";
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if (exists $files{$file}->{binary}) {
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$binary = $sbindir . "/" . $files{$file}->{binary};
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}
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print "probe $pname = process(\"$binary\").mark(\"$name\") {\n";
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my @args = split /,/, $args;
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for (my $i = 0 ; $i <= $#args ; $i++) {
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20
src/probes.d
20
src/probes.d
@ -69,4 +69,24 @@ provider libvirt {
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probe rpc_tls_session_handshake_pass(void *sess);
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probe rpc_tls_session_handshake_fail(void *sess);
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# file: src/qemu/qemu_monitor.c
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# prefix: qemu
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# binary: libvirtd
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# Monitor lifecycle
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probe qemu_monitor_new(void *mon, int refs, int fd);
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probe qemu_monitor_ref(void *mon, int refs);
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probe qemu_monitor_unref(void *mon, int refs);
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probe qemu_monitor_close(void *monm, int refs);
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# High level monitor message processing
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probe qemu_monitor_send_msg(void *mon, const char *msg, int fd);
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probe qemu_monitor_recv_reply(void *mon, const char *reply);
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probe qemu_monitor_recv_event(void *mon, const char *event);
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# Low level monitor I/O processing
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probe qemu_monitor_io_process(void *mon, const char *buf, unsigned int len);
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probe qemu_monitor_io_read(void *mon, const char *buf, unsigned int len, int ret, int errno);
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probe qemu_monitor_io_write(void *mon, const char *buf, unsigned int len, int ret, int errno);
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probe qemu_monitor_io_send_fd(void *mon, int fd, int ret, int errno);
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};
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@ -183,6 +183,8 @@ static void qemuMonitorFree(qemuMonitorPtr mon)
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int qemuMonitorRef(qemuMonitorPtr mon)
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{
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mon->refs++;
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PROBE(QEMU_MONITOR_REF,
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"mon=%p refs=%d", mon, mon->refs);
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return mon->refs;
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}
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@ -190,6 +192,8 @@ int qemuMonitorUnref(qemuMonitorPtr mon)
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{
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mon->refs--;
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PROBE(QEMU_MONITOR_UNREF,
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"mon=%p refs=%d", mon, mon->refs);
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if (mon->refs == 0) {
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qemuMonitorUnlock(mon);
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qemuMonitorFree(mon);
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@ -305,6 +309,9 @@ qemuMonitorIOProcess(qemuMonitorPtr mon)
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# endif
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#endif
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PROBE(QEMU_MONITOR_IO_PROCESS,
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"mon=%p buf=%s len=%zu", mon, mon->buffer, mon->bufferOffset);
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if (mon->json)
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len = qemuMonitorJSONIOProcess(mon,
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mon->buffer, mon->bufferOffset,
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@ -403,6 +410,18 @@ qemuMonitorIOWrite(qemuMonitorPtr mon)
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mon->msg->txLength - mon->msg->txOffset,
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mon->msg->txFD);
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PROBE(QEMU_MONITOR_IO_WRITE,
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"mon=%p buf=%s len=%d ret=%d errno=%d",
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mon,
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mon->msg->txBuffer + mon->msg->txOffset,
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mon->msg->txLength - mon->msg->txOffset,
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done, errno);
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if (mon->msg->txFD != -1)
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PROBE(QEMU_MONITOR_IO_SEND_FD,
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"mon=%p fd=%d ret=%d errno=%d",
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mon, mon->msg->txFD, done, errno);
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if (done < 0) {
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if (errno == EAGAIN)
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return 0;
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@ -696,7 +715,9 @@ qemuMonitorOpen(virDomainObjPtr vm,
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}
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qemuMonitorRef(mon);
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VIR_DEBUG("New mon %p fd =%d watch=%d", mon, mon->fd, mon->watch);
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PROBE(QEMU_MONITOR_NEW,
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"mon=%p refs=%d fd=%d",
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mon, mon->refs, mon->fd);
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qemuMonitorUnlock(mon);
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return mon;
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@ -719,9 +740,9 @@ void qemuMonitorClose(qemuMonitorPtr mon)
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if (!mon)
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return;
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VIR_DEBUG("mon=%p", mon);
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qemuMonitorLock(mon);
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PROBE(QEMU_MONITOR_CLOSE,
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"mon=%p refs=%d", mon, mon->refs);
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if (mon->fd >= 0) {
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if (mon->watch)
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@ -762,6 +783,10 @@ int qemuMonitorSend(qemuMonitorPtr mon,
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mon->msg = msg;
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qemuMonitorUpdateWatch(mon);
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PROBE(QEMU_MONITOR_SEND_MSG,
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"mon=%p msg=%s fd=%d",
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mon, mon->msg->txBuffer, mon->msg->txFD);
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while (!mon->msg->finished) {
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if (virCondWait(&mon->notify, &mon->lock) < 0) {
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qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
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@ -126,9 +126,13 @@ qemuMonitorJSONIOProcessLine(qemuMonitorPtr mon,
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if (virJSONValueObjectHasKey(obj, "QMP") == 1) {
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ret = 0;
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} else if (virJSONValueObjectHasKey(obj, "event") == 1) {
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PROBE(QEMU_MONITOR_RECV_EVENT,
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"mon=%p event=%s", mon, line);
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ret = qemuMonitorJSONIOProcessEvent(mon, obj);
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} else if (virJSONValueObjectHasKey(obj, "error") == 1 ||
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virJSONValueObjectHasKey(obj, "return") == 1) {
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PROBE(QEMU_MONITOR_RECV_REPLY,
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"mon=%p reply=%s", mon, line);
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if (msg) {
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msg->rxObject = obj;
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msg->finished = 1;
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@ -198,6 +198,9 @@ int qemuMonitorTextIOProcess(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
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VIR_DEBUG("Finished 0 byte reply");
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#endif
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}
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PROBE(QEMU_MONITOR_RECV_REPLY,
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"mon=%p reply=%s",
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mon, msg->rxBuffer);
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msg->finished = 1;
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used += end - (data + used);
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used += strlen(BASIC_PROMPT);
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