diff options
author | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2010-05-24 11:32:09 +0100 |
---|---|---|
committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-09-09 16:22:44 -0500 |
commit | 1e2cf2bc455622f9e0903a360cdaf6b89ec949a2 (patch) | |
tree | 3181cf9f43c5a8c7fda5a4765b589b58a20cbfdf /tracetool | |
parent | 22890ab5e825601f4c3d5a1a6b4197904e5d1fee (diff) |
trace: Support disabled events in trace-events
Sometimes it is useful to disable a trace event. Removing the event
from trace-events is not enough since source code will call the
trace_*() function for the event.
This patch makes it easy to build without specific trace events by
marking them disabled in trace-events:
disable multiwrite_cb(void *mcb, int ret) "mcb %p ret %d"
This builds without the multiwrite_cb trace event.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
trace: Allow bulk enabling/disabling of trace events at compile time
For 'simple' trace backend, allow bulk enabling/disabling of trace
events at compile time. Trace events that are preceded by 'disable'
keyword are compiled in, but turned off by default. These can
individually be turned on using the monitor. All other trace events are
enabled by default.
TODO :
This could be enhanced when the trace-event namespace is partitioned into a
group and an ID within that group. In such a case, marking a group as enabled
would automatically enable all trace-events listed under it.
Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Diffstat (limited to 'tracetool')
-rwxr-xr-x | tracetool | 44 |
1 files changed, 39 insertions, 5 deletions
@@ -87,6 +87,20 @@ get_fmt() echo "$fmt" } +# Get the state of a trace event +get_state() +{ + local str disable state + str=$(get_name "$1") + disable=${str##disable } + if [ "$disable" = "$str" ] ; then + state=1 + else + state=0 + fi + echo "$state" +} + linetoh_begin_nop() { return @@ -146,10 +160,14 @@ cast_args_to_uint64_t() linetoh_simple() { - local name args argc trace_args + local name args argc trace_args state name=$(get_name "$1") args=$(get_args "$1") argc=$(get_argc "$1") + state=$(get_state "$1") + if [ "$state" = "0" ]; then + name=${name##disable } + fi trace_args="$simple_event_num" if [ "$argc" -gt 0 ] @@ -188,10 +206,14 @@ EOF linetoc_simple() { - local name + local name state name=$(get_name "$1") + state=$(get_state "$1") + if [ "$state" = "0" ] ; then + name=${name##disable } + fi cat <<EOF -{.tp_name = "$name", .state=0}, +{.tp_name = "$name", .state=$state}, EOF simple_event_num=$((simple_event_num + 1)) } @@ -206,7 +228,7 @@ EOF # Process stdin by calling begin, line, and end functions for the backend convert() { - local begin process_line end + local begin process_line end str disable begin="lineto$1_begin_$backend" process_line="lineto$1_$backend" end="lineto$1_end_$backend" @@ -218,8 +240,20 @@ convert() str=${str%%#*} test -z "$str" && continue + # Process the line. The nop backend handles disabled lines. + disable=${str%%disable *} echo - "$process_line" "$str" + if test -z "$disable"; then + # Pass the disabled state as an arg to lineto$1_simple(). + # For all other cases, call lineto$1_nop() + if [ $backend = "simple" ]; then + "$process_line" "$str" + else + "lineto$1_nop" "${str##disable }" + fi + else + "$process_line" "$str" + fi done echo |