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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
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@ -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