[Qemu-devel] [PATCH 2/3] Monitor command 'trace'

[Prerna Saxena <prerna@linux.vnet.ibm.com>]

This introduces the monitor command 'trace' to read current contents of 
trace buffer. 


Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>
---
 configure       |    3 +++
 monitor.c       |    3 +++
 qemu-monitor.hx |   16 ++++++++++++++++
 simpletrace.c   |   15 +++++++++++++++
 tracetool       |    4 ++++
 5 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 675d0fc..56af8dd 100755
--- a/configure
+++ b/configure
@@ -2302,6 +2302,9 @@ bsd)
 esac
 
 echo "TRACE_BACKEND=$trace_backend" >> $config_host_mak
+if test "$trace_backend" = "simple"; then
+  echo "CONFIG_SIMPLE_TRACE=y" >> $config_host_mak
+fi
 if test "$trace_backend" = "ust"; then
   LIBS="-lust $LIBS"
 fi
diff --git a/monitor.c b/monitor.c
index ad50f12..fda29aa 100644
--- a/monitor.c
+++ b/monitor.c
@@ -55,6 +55,9 @@
 #include "json-streamer.h"
 #include "json-parser.h"
 #include "osdep.h"
+#ifdef CONFIG_SIMPLE_TRACE
+#include "trace.h"
+#endif
 
 //#define DEBUG
 //#define DEBUG_COMPLETION
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index b6e3467..c604aec 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -221,6 +221,22 @@ STEXI
 @item logfile @var{filename}
 @findex logfile
 Output logs to @var{filename}.
+#ifdef CONFIG_SIMPLE_TRACE
+ETEXI
+
+    {
+        .name       = "trace",
+        .args_type  = "",
+        .params     = "",
+        .help       = "shows contents of trace buffer",
+        .mhandler.cmd = do_info_trace,
+    },
+
+STEXI
+@item trace
+@findex trace
+show contents of trace buffer
+#endif
 ETEXI
 
     {
diff --git a/simpletrace.c b/simpletrace.c
index 2fec4d3..8f33a81 100644
--- a/simpletrace.c
+++ b/simpletrace.c
@@ -62,3 +62,18 @@ void trace4(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long
 void trace5(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5) {
     trace(event, x1, x2, x3, x4, x5);
 }
+
+void do_info_trace(Monitor *mon) {
+    static unsigned int i, max_idx;
+
+    if (trace_idx)
+        max_idx = trace_idx;
+    else
+        max_idx = TRACE_BUF_LEN;
+
+    for (i=0; i<max_idx ;i++)
+        monitor_printf(mon, "Event %ld : %ld %ld %ld %ld %ld\n",
+	trace_buf[i].event, trace_buf[i].x1, trace_buf[i].x2,
+	trace_buf[i].x3, trace_buf[i].x4, trace_buf[i].x5);
+    return;
+}
diff --git a/tracetool b/tracetool
index 9ea9c08..6c15154 100755
--- a/tracetool
+++ b/tracetool
@@ -130,6 +130,7 @@ void trace2(TraceEvent event, unsigned long x1, unsigned long x2);
 void trace3(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3);
 void trace4(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4);
 void trace5(TraceEvent event, unsigned long x1, unsigned long x2, unsigned long x3, unsigned long x4, unsigned long x5);
+void do_info_trace(Monitor *mon);
 EOF
 
     simple_event_num=0
@@ -289,6 +290,9 @@ tracetoh()
 #define TRACE_H
 
 #include "qemu-common.h"
+
+extern void monitor_printf(Monitor *mon, const char *fmt, ...)
+    __attribute__ ((__format__ (__printf__, 2, 3)));
 EOF
     convert h
     echo "#endif /* TRACE_H */"
-- 
1.6.2.5



-- 
Prerna Saxena

Linux Technology Centre,
IBM Systems and Technology Lab,
Bangalore, India