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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>
This commit is contained in:
Paolo Bonzini 2016-01-07 16:55:27 +03:00 committed by Stefan Hajnoczi
parent 10578a257d
commit e9527dd399
3 changed files with 29 additions and 1 deletions
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2
qemu-options.hx
View File

@ -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)

21
trace/control.c
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@ -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;

7
trace/control.h
View File

@ -181,6 +181,13 @@ 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,