diff options
| author | Lluís Vilanova <vilanova@ac.upc.edu> | 2016-07-11 12:53:41 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-07-18 18:23:12 +0100 |
| commit | 4815185902971c41fcdd700fa1fc3e1d9299900f (patch) | |
| tree | fcdcdbb543e1ea9828e4e8820368675692f761f3 /trace/control.c | |
| parent | e1d6e0a4c0e23b30501b887211f1fa6e0eb799a3 (diff) | |
trace: Add per-vCPU tracing states for events with the 'vcpu' property
Each vCPU gets a 'trace_dstate' bitmap to control the per-vCPU dynamic
tracing state of events with the 'vcpu' property.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'trace/control.c')
| -rw-r--r-- | trace/control.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/trace/control.c b/trace/control.c index 86de8b9983..d173c09f44 100644 --- a/trace/control.c +++ b/trace/control.c @@ -1,7 +1,7 @@ /* * Interface for configuring and controlling the state of tracing events. * - * Copyright (C) 2011-2014 Lluís Vilanova <vilanova@ac.upc.edu> + * Copyright (C) 2011-2016 Lluís Vilanova <vilanova@ac.upc.edu> * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. @@ -25,7 +25,14 @@ #include "monitor/monitor.h" int trace_events_enabled_count; -bool trace_events_dstate[TRACE_EVENT_COUNT]; +/* + * Interpretation depends on wether the event has the 'vcpu' property: + * - false: Boolean value indicating whether the event is active. + * - true : Integral counting the number of vCPUs that have this event enabled. + */ +uint16_t trace_events_dstate[TRACE_EVENT_COUNT]; +/* Marks events for late vCPU state init */ +static bool trace_events_dstate_init[TRACE_EVENT_COUNT]; QemuOptsList qemu_trace_opts = { .name = "trace", @@ -135,7 +142,10 @@ static void do_trace_enable_events(const char *line_buf) TraceEvent *ev = NULL; while ((ev = trace_event_pattern(line_ptr, ev)) != NULL) { if (trace_event_get_state_static(ev)) { + /* start tracing */ trace_event_set_state_dynamic(ev, enable); + /* mark for late vCPU init */ + trace_events_dstate_init[ev->id] = true; } } } else { @@ -147,7 +157,10 @@ static void do_trace_enable_events(const char *line_buf) error_report("WARNING: trace event '%s' is not traceable", line_ptr); } else { + /* start tracing */ trace_event_set_state_dynamic(ev, enable); + /* mark for late vCPU init */ + trace_events_dstate_init[ev->id] = true; } } } @@ -257,3 +270,15 @@ char *trace_opt_parse(const char *optarg) return trace_file; } + +void trace_init_vcpu_events(void) +{ + TraceEvent *ev = NULL; + while ((ev = trace_event_pattern("*", ev)) != NULL) { + if (trace_event_is_vcpu(ev) && + trace_event_get_state_static(ev) && + trace_events_dstate_init[ev->id]) { + trace_event_set_state_dynamic(ev, true); + } + } +} |