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trace: Add LTTng Userspace Tracer backend

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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 2010-05-22 21:11:33 +01:00 committed by Anthony Liguori
parent ab6540d55e
commit 7e24e92a06
2 changed files with 102 additions and 3 deletions
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20
configure vendored
View File

@ -903,7 +903,7 @@ echo " --enable-docs enable documentation build"
echo " --disable-docs disable documentation build"
echo " --disable-vhost-net disable vhost-net acceleration support"
echo " --enable-vhost-net enable vhost-net acceleration support"
echo " --trace-backend=B Trace backend nop simple"
echo " --trace-backend=B Trace backend nop simple ust"
echo " --trace-file=NAME Full PATH,NAME of file to store traces"
echo " Default:trace-<pid>"
echo ""
@ -2080,6 +2080,24 @@ if test "$?" -ne 0 ; then
exit 1
fi
##########################################
# For 'ust' backend, test if ust headers are present
if test "$trace_backend" = "ust"; then
cat > $TMPC << EOF
#include <ust/tracepoint.h>
#include <ust/marker.h>
int main(void) { return 0; }
EOF
if compile_prog "" "" ; then
LIBS="-lust $LIBS"
else
echo
echo "Error: Trace backend 'ust' missing libust header files"
echo
exit 1
fi
fi
##########################################
# End of CC checks
# After here, no more $cc or $ld runs

85
tracetool
View File

@ -13,12 +13,13 @@ set -f
usage()
{
cat >&2 <<EOF
usage: $0 [--nop | --simple] [-h | -c]
usage: $0 [--nop | --simple | --ust] [-h | -c]
Generate tracing code for a file on stdin.
Backends:
--nop Tracing disabled
--simple Simple built-in backend
--ust LTTng User Space Tracing backend
Output formats:
-h Generate .h file
@ -225,6 +226,86 @@ linetoc_end_simple()
EOF
}
# Clean up after UST headers which pollute the namespace
ust_clean_namespace() {
cat <<EOF
#undef mutex_lock
#undef mutex_unlock
#undef inline
#undef wmb
EOF
}
linetoh_begin_ust()
{
echo "#include <ust/tracepoint.h>"
ust_clean_namespace
}
linetoh_ust()
{
local name args argnames
name=$(get_name "$1")
args=$(get_args "$1")
argnames=$(get_argnames "$1")
cat <<EOF
DECLARE_TRACE(ust_$name, TPPROTO($args), TPARGS($argnames));
#define trace_$name trace_ust_$name
EOF
}
linetoh_end_ust()
{
return
}
linetoc_begin_ust()
{
cat <<EOF
#include <ust/marker.h>
$(ust_clean_namespace)
#include "trace.h"
EOF
}
linetoc_ust()
{
local name args argnames fmt
name=$(get_name "$1")
args=$(get_args "$1")
argnames=$(get_argnames "$1")
fmt=$(get_fmt "$1")
cat <<EOF
DEFINE_TRACE(ust_$name);
static void ust_${name}_probe($args)
{
trace_mark(ust, $name, "$fmt", $argnames);
}
EOF
# Collect names for later
names="$names $name"
}
linetoc_end_ust()
{
cat <<EOF
static void __attribute__((constructor)) trace_init(void)
{
EOF
for name in $names; do
cat <<EOF
register_trace_ust_$name(ust_${name}_probe);
EOF
done
echo "}"
}
# Process stdin by calling begin, line, and end functions for the backend
convert()
{
@ -282,7 +363,7 @@ tracetoc()
# Choose backend
case "$1" in
"--nop" | "--simple") backend="${1#--}" ;;
"--nop" | "--simple" | "--ust") backend="${1#--}" ;;
*) usage ;;
esac
shift