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454e202d52
A basic wildcard matching is supported in both the monitor command
"trace-event" and the events list file. That means you can enable/disable
the events having a common prefix in a batch. For example, virtio-blk trace
events could be enabled using:
trace-event virtio_blk_* on
Signed-off-by: Mark Wu <wudxw@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
#include "trace.h"
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#include "trace/control.h"
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void trace_print_events(FILE *stream, fprintf_function stream_printf)
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{
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unsigned int i;
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for (i = 0; i < NR_TRACE_EVENTS; i++) {
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stream_printf(stream, "%s [Event ID %u] : state %u\n",
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trace_list[i].tp_name, i, trace_list[i].state);
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}
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}
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bool trace_event_set_state(const char *name, bool state)
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{
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unsigned int i;
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unsigned int len;
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bool wildcard = false;
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bool matched = false;
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len = strlen(name);
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if (len > 0 && name[len - 1] == '*') {
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wildcard = true;
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len -= 1;
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}
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for (i = 0; i < NR_TRACE_EVENTS; i++) {
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if (wildcard) {
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if (!strncmp(trace_list[i].tp_name, name, len)) {
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trace_list[i].state = state;
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matched = true;
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}
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continue;
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}
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if (!strcmp(trace_list[i].tp_name, name)) {
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trace_list[i].state = state;
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return true;
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}
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}
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return matched;
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}
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bool trace_backend_init(const char *events, const char *file)
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{
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if (file) {
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fprintf(stderr, "error: -trace file=...: "
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"option not supported by the selected tracing backend\n");
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return false;
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}
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trace_backend_init_events(events);
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return true;
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}
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