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Adds support to compile QEMU with multiple tracing backends at the same time. For example, you can compile QEMU with: $ ./configure --enable-trace-backends=ftrace,dtrace Where 'ftrace' can be handy for having an in-flight record of events, and 'dtrace' can be later used to extract more information from the system. This patch allows having both available without recompiling QEMU. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>pull/12/head
Lluís Vilanova
12 years ago
committed by
Stefan Hajnoczi
Stefan Hajnoczi
20 changed files with 153 additions and 234 deletions
@ -1,40 +0,0 @@ |
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/*
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* Default implementation for backend initialization from commandline. |
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* |
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* Copyright (C) 2011-2012 Lluís Vilanova <vilanova@ac.upc.edu> |
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* |
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* This work is licensed under the terms of the GNU GPL, version 2. See |
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* the COPYING file in the top-level directory. |
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*/ |
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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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fprintf(stderr, "warning: " |
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"cannot print the trace events with the current backend\n"); |
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stream_printf(stream, "error: " |
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"operation not supported with the current backend\n"); |
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} |
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void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state) |
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{ |
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fprintf(stderr, "warning: " |
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"cannot set the state of a trace event with the current backend\n"); |
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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 (events) { |
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fprintf(stderr, "error: -trace events=...: " |
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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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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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return true; |
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} |
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@ -1,10 +1,15 @@ |
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#ifndef TRACE_FTRACE_H |
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#define TRACE_FTRACE_H |
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#include <stdbool.h> |
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#define MAX_TRACE_STRLEN 512 |
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#define _STR(x) #x |
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#define STR(x) _STR(x) |
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extern int trace_marker_fd; |
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bool ftrace_init(void); |
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#endif /* ! TRACE_FTRACE_H */ |
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@ -1,30 +0,0 @@ |
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#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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TraceEventID i; |
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for (i = 0; i < trace_event_count(); i++) { |
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TraceEvent *ev = trace_event_id(i); |
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stream_printf(stream, "%s [Event ID %u] : state %u\n", |
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trace_event_get_name(ev), i, trace_event_get_state_dynamic(ev)); |
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} |
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} |
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void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state) |
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{ |
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ev->dstate = state; |
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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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