diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-01-07 16:55:27 +0300 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-02-03 09:19:09 +0000 |
| commit | e9527dd399ed213ec6eb2c0ea54be663a73032b0 (patch) | |
| tree | 82c51106e2f983f1d038ec499a0236be42c71e4e | |
| parent | 10578a257d94fb59449d0b0e441990c45a036ccc (diff) | |
trace: add "-trace help"
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>
| -rw-r--r-- | qemu-options.hx | 2 | ||||
| -rw-r--r-- | trace/control.c | 21 | ||||
| -rw-r--r-- | trace/control.h | 7 |
3 files changed, 29 insertions, 1 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index 35dc725958..733a1949e9 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 af92705bb4..bef7884ee1 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 d5081ce169..d5bc86e5f1 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. |