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author | Paolo Bonzini <pbonzini@redhat.com> | 2016-01-07 16:55:26 +0300 |
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committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-02-03 09:19:09 +0000 |
commit | 10578a257d94fb59449d0b0e441990c45a036ccc (patch) | |
tree | 5fc5b4d0935e70c3c2c784bc7dec0694e12e0b23 /trace/control.c | |
parent | f246b86672118e4f0d0782f4c240d3666aa36710 (diff) | |
download | qemu-10578a257d94fb59449d0b0e441990c45a036ccc.zip qemu-10578a257d94fb59449d0b0e441990c45a036ccc.tar.gz qemu-10578a257d94fb59449d0b0e441990c45a036ccc.tar.bz2 |
trace: add "-trace enable=..."
Allow enabling events without going through a file, for example:
qemu-system-x86_64 -trace bdrv_aio_writev -trace bdrv_aio_readv
or with globbing too:
qemu-system-x86_64 -trace 'bdrv_aio_*'
if an appropriate backend is enabled (simple, stderr, ftrace).
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: 1452174932-28657-6-git-send-email-den@openvz.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'trace/control.c')
-rw-r--r-- | trace/control.c | 48 |
1 files changed, 27 insertions, 21 deletions
diff --git a/trace/control.c b/trace/control.c index f5a497a..af92705 100644 --- a/trace/control.c +++ b/trace/control.c @@ -88,6 +88,32 @@ TraceEvent *trace_event_pattern(const char *pat, TraceEvent *ev) return NULL; } +void trace_enable_events(const char *line_buf) +{ + const bool enable = ('-' != line_buf[0]); + const char *line_ptr = enable ? line_buf : line_buf + 1; + + if (trace_event_is_pattern(line_ptr)) { + TraceEvent *ev = NULL; + while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) { + if (trace_event_get_state_static(ev)) { + trace_event_set_state_dynamic(ev, enable); + } + } + } else { + TraceEvent *ev = trace_event_name(line_ptr); + if (ev == NULL) { + error_report("WARNING: trace event '%s' does not exist", + line_ptr); + } else if (!trace_event_get_state_static(ev)) { + error_report("WARNING: trace event '%s' is not traceable", + line_ptr); + } else { + trace_event_set_state_dynamic(ev, enable); + } + } +} + void trace_init_events(const char *fname) { Location loc; @@ -114,27 +140,7 @@ void trace_init_events(const char *fname) if ('#' == line_buf[0]) { /* skip commented lines */ continue; } - const bool enable = ('-' != line_buf[0]); - char *line_ptr = enable ? line_buf : line_buf + 1; - if (trace_event_is_pattern(line_ptr)) { - TraceEvent *ev = NULL; - while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) { - if (trace_event_get_state_static(ev)) { - trace_event_set_state_dynamic(ev, enable); - } - } - } else { - TraceEvent *ev = trace_event_name(line_ptr); - if (ev == NULL) { - error_report("WARNING: trace event '%s' does not exist", - line_ptr); - } else if (!trace_event_get_state_static(ev)) { - error_report("WARNING: trace event '%s' is not traceable", - line_ptr); - } else { - trace_event_set_state_dynamic(ev, enable); - } - } + trace_enable_events(line_buf); } } if (fclose(fp) != 0) { |