From patchwork Thu Oct 21 09:40:18 2010
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Subject: [RFC,4/5] trace-event
Date: Wed, 20 Oct 2010 23:40:18 -0000
From: Prerna Saxena <prerna@linux.vnet.ibm.com>
X-Patchwork-Id: 68562
Message-Id: <20101021151018.3d12b5f1@zephyr>
To: Prerna Saxena <prerna@linux.vnet.ibm.com>
Cc: Mahesh <mahesh@linux.vnet.ibm.com>,
 Ananth Narayan <ananth@linux.vnet.ibm.com>,
 qemu-devel <qemu-devel@nongnu.org>,
 Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
 Luiz Capitulino <lcapitulino@redhat.com>

trace-event : QMP interface to change state of a trace-event.
(Analogous to hmp command : trace-event )

Signed-off-by: Prerna Saxena <prerna@linux.vnet.ibm.com>

---
qmp-commands.hx |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/qmp-commands.hx b/qmp-commands.hx
index 7e95f4e..f2008e8 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -761,6 +761,38 @@ Example:
 
 Note: This command must be issued before issuing any other command.
 
+EQMP
+
+    {
+        .name       = "trace-event",
+        .args_type  = "name:s,option:b",
+        .params     = "name on|off",
+        .help       = "changes state of a specific trace event",
+        .user_print = monitor_user_noop,
+        .mhandler.cmd_new = do_change_trace_event_state_qmp,
+    },
+
+SQMP
+trace-event
+-----------
+
+Change state of a trace-event.
+
+Arguments:
+
+- "name": name of trace-event (json-string)
+- "enable": New state to be set for the trace-event (json-bool)
+
+Example:
+
+-> { "execute": "trace-event", "arguments": { "name": "ABC", "enable":false } }
+<- { "return": {} }
+
+Notes:
+
+(1) The 'query-trace-events' command should be used to check the new state
+    of the trace-event.
+
 3. Query Commands
 =================