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authorPrerna Saxena <prerna@linux.vnet.ibm.com>2010-06-24 17:04:53 +0530
committerAnthony Liguori <aliguori@us.ibm.com>2010-09-09 16:22:44 -0500
commit22890ab5e825601f4c3d5a1a6b4197904e5d1fee (patch)
treea2d75e9328a15bb4a0fc589015f8908f26b25282 /tracetool
parent26f7227bfe9a9abee3fe5190cbfc35dd876e06d9 (diff)
trace: Support for dynamically enabling/disabling trace events
This patch adds support for dynamically enabling/disabling of trace events. This is done by internally maintaining each trace event's state, and permitting logging of data from a trace event only if it is in an 'active' state. Monitor commands added : 1) info trace-events : to view all available trace events and their state. 2) trace-event NAME on|off : to enable/disable data logging from a given trace event. Eg, trace-event paio_submit off disables logging of data when paio_submit is hit. By default, all trace-events are disabled. One can enable desired trace-events via the monitor. Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> trace: Monitor command 'info trace' Monitor command 'info trace' to display contents of trace buffer Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> trace: Remove monitor.h dependency from simpletrace User-mode targets don't have a monitor so the simple trace backend currently does not build on those targets. This patch abstracts the monitor printing interface so there is no direct coupling between simpletrace and the monitor. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Diffstat (limited to 'tracetool')
-rwxr-xr-xtracetool24
1 files changed, 20 insertions, 4 deletions
diff --git a/tracetool b/tracetool
index 19b1659bc0..2e2e37dbd3 100755
--- a/tracetool
+++ b/tracetool
@@ -169,22 +169,38 @@ EOF
linetoh_end_simple()
{
- return
+ cat <<EOF
+#define NR_TRACE_EVENTS $simple_event_num
+extern TraceEvent trace_list[NR_TRACE_EVENTS];
+EOF
}
linetoc_begin_simple()
{
- return
+ cat <<EOF
+#include "trace.h"
+
+TraceEvent trace_list[] = {
+EOF
+ simple_event_num=0
+
}
linetoc_simple()
{
- return
+ local name
+ name=$(get_name "$1")
+ cat <<EOF
+{.tp_name = "$name", .state=0},
+EOF
+ simple_event_num=$((simple_event_num + 1))
}
linetoc_end_simple()
{
- return
+ cat <<EOF
+};
+EOF
}
# Process stdin by calling begin, line, and end functions for the backend