From 1dde0f48d53ad39401ec5064a61162d6784aad44 Mon Sep 17 00:00:00 2001 From: Lluís Vilanova Date: Mon, 25 Aug 2014 13:19:57 +0200 Subject: trace: [qmp] Add commands to query and control event tracing state MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Lluís Vilanova Message-id: 20140825111957.31112.31733.stgit@fimbulvetr.bsc.es Signed-off-by: Stefan Hajnoczi --- trace/Makefile.objs | 1 + trace/qmp.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+) create mode 100644 trace/qmp.c (limited to 'trace') diff --git a/trace/Makefile.objs b/trace/Makefile.objs index 46de95c1a6..32f7a32ce2 100644 --- a/trace/Makefile.objs +++ b/trace/Makefile.objs @@ -144,3 +144,4 @@ util-obj-$(CONFIG_TRACE_SIMPLE) += simple.o generated-tracers.o util-obj-$(CONFIG_TRACE_FTRACE) += ftrace.o util-obj-$(CONFIG_TRACE_UST) += generated-ust.o util-obj-y += control.o +util-obj-y += qmp.o diff --git a/trace/qmp.c b/trace/qmp.c new file mode 100644 index 0000000000..0b19489528 --- /dev/null +++ b/trace/qmp.c @@ -0,0 +1,75 @@ +/* + * QMP commands for tracing events. + * + * Copyright (C) 2014 Lluís Vilanova + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/typedefs.h" +#include "qmp-commands.h" +#include "trace/control.h" + + +TraceEventInfoList *qmp_trace_event_get_state(const char *name, Error **errp) +{ + TraceEventInfoList *events = NULL; + bool found = false; + TraceEvent *ev; + + ev = NULL; + while ((ev = trace_event_pattern(name, ev)) != NULL) { + TraceEventInfoList *elem = g_new(TraceEventInfoList, 1); + elem->value = g_new(TraceEventInfo, 1); + elem->value->name = g_strdup(trace_event_get_name(ev)); + if (!trace_event_get_state_static(ev)) { + elem->value->state = TRACE_EVENT_STATE_UNAVAILABLE; + } else if (!trace_event_get_state_dynamic(ev)) { + elem->value->state = TRACE_EVENT_STATE_DISABLED; + } else { + elem->value->state = TRACE_EVENT_STATE_ENABLED; + } + elem->next = events; + events = elem; + found = true; + } + + if (!found && !trace_event_is_pattern(name)) { + error_setg(errp, "unknown event \"%s\"", name); + } + + return events; +} + +void qmp_trace_event_set_state(const char *name, bool enable, + bool has_ignore_unavailable, + bool ignore_unavailable, Error **errp) +{ + bool found = false; + TraceEvent *ev; + + /* Check all selected events are dynamic */ + ev = NULL; + while ((ev = trace_event_pattern(name, ev)) != NULL) { + found = true; + if (!(has_ignore_unavailable && ignore_unavailable) && + !trace_event_get_state_static(ev)) { + error_setg(errp, "cannot set dynamic tracing state for \"%s\"", + trace_event_get_name(ev)); + return; + } + } + if (!found && !trace_event_is_pattern(name)) { + error_setg(errp, "unknown event \"%s\"", name); + return; + } + + /* Apply changes */ + ev = NULL; + while ((ev = trace_event_pattern(name, ev)) != NULL) { + if (trace_event_get_state_static(ev)) { + trace_event_set_state_dynamic(ev, enable); + } + } +} -- cgit v1.2.3