From: Stefan Hajnoczi <stefanha@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Denis V. Lunev" <den@openvz.org>,
Peter Maydell <peter.maydell@linaro.org>,
Stefan Hajnoczi <stefanha@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: [Qemu-devel] [PULL 08/13] trace: add "-trace help"
Date: Wed, 3 Feb 2016 15:47:40 +0000 [thread overview]
Message-ID: <1454514465-11856-9-git-send-email-stefanha@redhat.com> (raw)
In-Reply-To: <1454514465-11856-1-git-send-email-stefanha@redhat.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Print a list of trace points
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-id: 1452174932-28657-7-git-send-email-den@openvz.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
qemu-options.hx | 2 ++
trace/control.c | 21 ++++++++++++++++++++-
trace/control.h | 7 +++++++
3 files changed, 29 insertions(+), 1 deletion(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index 35dc725..733a194 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3564,6 +3564,8 @@ available if QEMU has been compiled with the @var{simple}, @var{stderr}
or @var{ftrace} tracing backend. To specify multiple events or patterns,
specify the @option{-trace} option multiple times.
+Use @code{-trace help} to print a list of names of trace points.
+
@item events=@var{file}
Immediately enable events listed in @var{file}.
The file must contain one event name (as listed in the @file{trace-events} file)
diff --git a/trace/control.c b/trace/control.c
index af92705..bef7884 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -88,7 +88,16 @@ TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev)
return NULL;
}
-void trace_enable_events(const char *line_buf)
+void trace_list_events(void)
+{
+ int i;
+ for (i = 0; i < trace_event_count(); i++) {
+ TraceEvent *res = trace_event_id(i);
+ fprintf(stderr, "%s\n", trace_event_get_name(res));
+ }
+}
+
+static void do_trace_enable_events(const char *line_buf)
{
const bool enable = ('-' != line_buf[0]);
const char *line_ptr = enable ? line_buf : line_buf + 1;
@@ -114,6 +123,16 @@ void trace_enable_events(const char *line_buf)
}
}
+void trace_enable_events(const char *line_buf)
+{
+ if (is_help_option(line_buf)) {
+ trace_list_events();
+ exit(0);
+ } else {
+ do_trace_enable_events(line_buf);
+ }
+}
+
void trace_init_events(const char *fname)
{
Location loc;
diff --git a/trace/control.h b/trace/control.h
index d5081ce..d5bc86e 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -182,6 +182,13 @@ void trace_init_events(const char *file);
void trace_init_file(const char *file);
/**
+ * trace_list_events:
+ *
+ * List all available events.
+ */
+void trace_list_events(void);
+
+/**
* trace_enable_events:
* @line_buf: A string with a glob pattern of events to be enabled or,
* if the string starts with '-', disabled.
--
2.5.0
next prev parent reply other threads:[~2016-02-03 15:48 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 15:47 [Qemu-devel] [PULL 00/13] Tracing patches Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 01/13] trace: count number of enabled events Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 02/13] trace: track enabled events in a separate array Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 03/13] trace: fix documentation Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 04/13] trace: split trace_init_events out of trace_init_backends Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 05/13] trace: split trace_init_file " Stefan Hajnoczi
2016-02-08 18:43 ` Alex Bennée
2016-02-09 11:17 ` Denis V. Lunev
2016-02-09 12:28 ` Alex Bennée
2016-02-09 19:19 ` Denis V. Lunev
2016-02-03 15:47 ` [Qemu-devel] [PULL 06/13] trace: no need to call trace_backend_init in different branches now Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 07/13] trace: add "-trace enable=..." Stefan Hajnoczi
2016-02-03 15:47 ` Stefan Hajnoczi [this message]
2016-02-03 15:47 ` [Qemu-devel] [PULL 09/13] log: do not unnecessarily include qom/cpu.h Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 10/13] log: move qemu-log.c into util/ directory Stefan Hajnoczi
2016-02-03 16:03 ` Daniel P. Berrange
2016-02-03 16:15 ` Denis V. Lunev
2016-02-03 16:36 ` Eric Blake
2016-02-03 17:38 ` Dimitris Aragiorgis
2016-02-03 18:46 ` Paolo Bonzini
2016-02-03 15:47 ` [Qemu-devel] [PULL 11/13] trace: convert stderr backend to log Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 12/13] trace: switch default backend to "log" Stefan Hajnoczi
2016-02-03 15:47 ` [Qemu-devel] [PULL 13/13] log: add "-d trace:PATTERN" Stefan Hajnoczi
2016-02-03 17:55 ` [Qemu-devel] [PULL 00/13] Tracing patches Peter Maydell
2016-02-03 18:49 ` Paolo Bonzini
2016-02-04 11:05 ` Peter Maydell
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