From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
Document the -V option for trace-cmd listen/record in both the usage and the
man pages.
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
---
Documentation/trace-cmd/trace-cmd-listen.1.txt | 4 ++++
Documentation/trace-cmd/trace-cmd-record.1.txt | 8 ++++++++
tracecmd/trace-usage.c | 2 ++
3 files changed, 14 insertions(+)
diff --git a/Documentation/trace-cmd/trace-cmd-listen.1.txt b/Documentation/trace-cmd/trace-cmd-listen.1.txt
index aa6a307ff3b7..7c6093ba5354 100644
--- a/Documentation/trace-cmd/trace-cmd-listen.1.txt
+++ b/Documentation/trace-cmd/trace-cmd-listen.1.txt
@@ -26,6 +26,10 @@ OPTIONS
This options causes trace-cmd listen to go into a daemon mode and run in
the background.
+*-V*::
+ Listen on a vsocket instead. This is useful for tracing between host and
+ guest VMs.
+
*-d* 'dir'::
This option specifies a directory to write the data files into.
diff --git a/Documentation/trace-cmd/trace-cmd-record.1.txt b/Documentation/trace-cmd/trace-cmd-record.1.txt
index 426e856bf74a..6b8e3b4ad364 100644
--- a/Documentation/trace-cmd/trace-cmd-record.1.txt
+++ b/Documentation/trace-cmd/trace-cmd-record.1.txt
@@ -259,6 +259,14 @@ OPTIONS
Note: This option is not supported with latency tracer plugins:
wakeup, wakeup_rt, irqsoff, preemptoff and preemptirqsoff
+*-V* 'cid:port'::
+ If recording on a guest VM and the host is running *trace-cmd listen* with
+ the *-V* option as well, or if this is recording on the host, and a guest
+ in running *trace-cmd listen* with the *-V* option, then connect to the
+ listener (the same as connecting with the *-N* option via the network).
+ This has the same limitations as the *-N* option above with respect to
+ latency tracer plugins.
+
*-t*::
This option is used with *-N*, when there's a need to send the live data
with TCP packets instead of UDP. Although TCP is not nearly as fast as
diff --git a/tracecmd/trace-usage.c b/tracecmd/trace-usage.c
index 20995fabed73..ec6376557394 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -44,6 +44,7 @@ static struct usage_help usage_help[] = {
" -s sleep interval between recording (in usecs) [default: 1000]\n"
" -S used with --profile, to enable only events in command line\n"
" -N host:port to connect to (see listen)\n"
+ " -V cid:port to connect to via vsocket (see listen)\n"
" -t used with -N, forces use of tcp in live trace\n"
" -b change kernel buffersize (in kilobytes per CPU)\n"
" -B create sub buffer and following events will be enabled here\n"
@@ -318,6 +319,7 @@ static struct usage_help usage_help[] = {
" Creates a socket to listen for clients.\n"
" -p port number to listen on.\n"
" -D run in daemon mode.\n"
+ " -V listen on a vsocket instead.\n"
" -o file name to use for clients.\n"
" -d directory to store client files.\n"
" -l logfile to write messages to.\n"
--
2.35.1
|