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authorStefan Hajnoczi <stefanha@linux.vnet.ibm.com>2010-05-24 11:32:09 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2010-09-09 16:22:44 -0500
commit1e2cf2bc455622f9e0903a360cdaf6b89ec949a2 (patch)
tree3181cf9f43c5a8c7fda5a4765b589b58a20cbfdf /tracetool
parent22890ab5e825601f4c3d5a1a6b4197904e5d1fee (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-xtracetool44
1 files changed, 39 insertions, 5 deletions
diff --git a/tracetool b/tracetool
index 2e2e37dbd3..8aeac4870b 100755
--- a/tracetool
+++ b/tracetool
@@ -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