qemu/trace/control.c

4  * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu>
7  * See the COPYING file in the top-level directory.
11 #include "trace/control.h"
15 #include "trace/simple.h"
18 #include "trace/ftrace.h"
27 #include "qemu/error-report.h"
28 #include "qemu/config-file.h"
45     .name = "trace",
46     .implied_opt_name = "enable",
50             .name = "enable",
69         events[i]->id = next_id++;  in trace_event_register_group()
76     st_init_group(nevent_groups - 1);  in trace_event_register_group()
98     iter->event = 0;  in trace_event_iter_init_all()
99     iter->group = 0;  in trace_event_iter_init_all()
100     iter->group_id = -1;  in trace_event_iter_init_all()
101     iter->pattern = NULL;  in trace_event_iter_init_all()
107     iter->pattern = pattern;  in trace_event_iter_init_pattern()
113     iter->group_id = group_id;  in trace_event_iter_init_group()
118     while (iter->group < nevent_groups &&  in trace_event_iter_next()
119            event_groups[iter->group].events[iter->event] != NULL) {  in trace_event_iter_next()
120         TraceEvent *ev = event_groups[iter->group].events[iter->event];  in trace_event_iter_next()
121         size_t group = iter->group;  in trace_event_iter_next()
122         iter->event++;  in trace_event_iter_next()
123         if (event_groups[iter->group].events[iter->event] == NULL) {  in trace_event_iter_next()
124             iter->event = 0;  in trace_event_iter_next()
125             iter->group++;  in trace_event_iter_next()
127         if (iter->pattern &&  in trace_event_iter_next()
128             !g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {  in trace_event_iter_next()
131         if (iter->group_id != -1 &&  in trace_event_iter_next()
132             iter->group_id != group) {  in trace_event_iter_next()
150     fprintf(f, "This list of names of trace points may be incomplete "  in trace_list_events()
152                "Run 'qemu-trace-stap list %s' to print the full list.\n",  in trace_list_events()
159     const bool enable = ('-' != line_buf[0]);  in do_trace_enable_events()  local
160     const char *line_ptr = enable ? line_buf : line_buf + 1;  in do_trace_enable_events()
169                 warn_report("trace event '%s' is not traceable",  in do_trace_enable_events()
177         trace_event_set_state_dynamic(ev, enable);  in do_trace_enable_events()
184         warn_report("trace event '%s' does not exist",  in do_trace_enable_events()
223             line_buf[len - 1] = '\0';  in trace_init_events()
247      * If both the simple and the log backends are enabled, "--trace file"  in trace_init_file()
248      * only applies to the simple backend; use "-D" for the log  in trace_init_file()
249      * backend. However we should only override -D if we actually have  in trace_init_file()
257         fprintf(stderr, "error: --trace file=...: "  in trace_init_file()
268         fprintf(stderr, "failed to initialize simple tracing backend.\n");  in trace_init_backends()
275         fprintf(stderr, "failed to initialize ftrace backend.\n");  in trace_init_backends()
289     QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("trace"),  in trace_opt_parse()
294     if (qemu_opt_get(opts, "enable")) {  in trace_opt_parse()
295         trace_enable_events(qemu_opt_get(opts, "enable"));  in trace_opt_parse()