trace: Add LTTng Userspace Tracer backend
This patch adds LTTng Userspace Tracer (UST) backend support. The UST
system requires no kernel support but libust and liburcu must be
installed.
$ ./configure --trace-backend ust
$ make
Start the UST daemon:
$ ustd &
List available tracepoints and enable some:
$ ustctl --list-markers $(pgrep qemu)
[...]
{PID: 5458, channel/marker: ust/paio_submit, state: 0, fmt: "acb %p
opaque %p sector_num %lu nb_sectors %lu type %lu" 0x4b32ba}
$ ustctl --enable-marker "ust/paio_submit" $(pgrep qemu)
Run the trace:
$ ustctl --create-trace $(pgrep qemu)
$ ustctl --start-trace $(pgrep qemu)
[...]
$ ustctl --stop-trace $(pgrep qemu)
$ ustctl --destroy-trace $(pgrep qemu)
Trace results can be viewed using lttv-gui.
More information about UST:
http://lttng.org/ust
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
trace: Check for LTTng Userspace Tracer headers
When using the 'ust' backend, check if the relevant headers are
available at host.
Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Stefan Hajnoczi
Anthony Liguori
parent
ab6540d55e
commit
7e24e92a06
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@ -903,7 +903,7 @@ echo " --enable-docs enable documentation build"
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echo " --disable-docs disable documentation build"
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echo " --disable-vhost-net disable vhost-net acceleration support"
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echo " --enable-vhost-net enable vhost-net acceleration support"
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echo " --trace-backend=B Trace backend nop simple"
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echo " --trace-backend=B Trace backend nop simple ust"
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echo " --trace-file=NAME Full PATH,NAME of file to store traces"
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echo " Default:trace-<pid>"
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echo ""
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@ -2080,6 +2080,24 @@ if test "$?" -ne 0 ; then
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exit 1
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fi
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##########################################
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# For 'ust' backend, test if ust headers are present
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if test "$trace_backend" = "ust"; then
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cat > $TMPC << EOF
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#include <ust/tracepoint.h>
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#include <ust/marker.h>
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int main(void) { return 0; }
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EOF
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if compile_prog "" "" ; then
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LIBS="-lust $LIBS"
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else
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echo
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echo "Error: Trace backend 'ust' missing libust header files"
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echo
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exit 1
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fi
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fi
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##########################################
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# End of CC checks
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# After here, no more $cc or $ld runs
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85
tracetool
85
tracetool
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@ -13,12 +13,13 @@ set -f
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usage()
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{
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cat >&2 <<EOF
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usage: $0 [--nop | --simple] [-h | -c]
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usage: $0 [--nop | --simple | --ust] [-h | -c]
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Generate tracing code for a file on stdin.
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Backends:
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--nop Tracing disabled
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--simple Simple built-in backend
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--ust LTTng User Space Tracing backend
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Output formats:
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-h Generate .h file
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@ -225,6 +226,86 @@ linetoc_end_simple()
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EOF
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}
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# Clean up after UST headers which pollute the namespace
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ust_clean_namespace() {
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cat <<EOF
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#undef mutex_lock
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#undef mutex_unlock
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#undef inline
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#undef wmb
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EOF
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}
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linetoh_begin_ust()
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{
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echo "#include <ust/tracepoint.h>"
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ust_clean_namespace
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}
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linetoh_ust()
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{
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local name args argnames
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name=$(get_name "$1")
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args=$(get_args "$1")
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argnames=$(get_argnames "$1")
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cat <<EOF
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DECLARE_TRACE(ust_$name, TPPROTO($args), TPARGS($argnames));
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#define trace_$name trace_ust_$name
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EOF
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}
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linetoh_end_ust()
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{
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return
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}
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linetoc_begin_ust()
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{
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cat <<EOF
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#include <ust/marker.h>
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$(ust_clean_namespace)
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#include "trace.h"
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EOF
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}
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linetoc_ust()
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{
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local name args argnames fmt
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name=$(get_name "$1")
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args=$(get_args "$1")
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argnames=$(get_argnames "$1")
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fmt=$(get_fmt "$1")
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cat <<EOF
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DEFINE_TRACE(ust_$name);
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static void ust_${name}_probe($args)
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{
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trace_mark(ust, $name, "$fmt", $argnames);
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}
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EOF
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# Collect names for later
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names="$names $name"
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}
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linetoc_end_ust()
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{
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cat <<EOF
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static void __attribute__((constructor)) trace_init(void)
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{
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EOF
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for name in $names; do
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cat <<EOF
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register_trace_ust_$name(ust_${name}_probe);
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EOF
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done
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echo "}"
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}
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# Process stdin by calling begin, line, and end functions for the backend
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convert()
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{
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@ -282,7 +363,7 @@ tracetoc()
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# Choose backend
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case "$1" in
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"--nop" | "--simple") backend="${1#--}" ;;
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"--nop" | "--simple" | "--ust") backend="${1#--}" ;;
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*) usage ;;
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esac
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shift
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