From 5b808275f3bbe8cc95bb9301f4d5a41331d0e0e6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Llu=C3=ADs=20Vilanova?= Date: Tue, 27 May 2014 15:02:14 +0200 Subject: trace: Multi-backend tracing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Stefan Hajnoczi --- trace/ftrace.c | 25 +------------------------ 1 file changed, 1 insertion(+), 24 deletions(-) (limited to 'trace/ftrace.c') diff --git a/trace/ftrace.c b/trace/ftrace.c index 46b7fdb1f2..a7ae371e6f 100644 --- a/trace/ftrace.c +++ b/trace/ftrace.c @@ -42,35 +42,13 @@ static int find_debugfs(char *debugfs) return 1; } -void trace_print_events(FILE *stream, fprintf_function stream_printf) -{ - TraceEventID i; - - for (i = 0; i < trace_event_count(); i++) { - TraceEvent *ev = trace_event_id(i); - stream_printf(stream, "%s [Event ID %u] : state %u\n", - trace_event_get_name(ev), i, trace_event_get_state_dynamic(ev)); - } -} - -void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state) -{ - ev->dstate = state; -} - -bool trace_backend_init(const char *events, const char *file) +bool ftrace_init(void) { char debugfs[PATH_MAX]; char path[PATH_MAX]; int debugfs_found; int trace_fd = -1; - if (file) { - fprintf(stderr, "error: -trace file=...: " - "option not supported by the selected tracing backend\n"); - return false; - } - debugfs_found = find_debugfs(debugfs); if (debugfs_found) { snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs); @@ -97,6 +75,5 @@ bool trace_backend_init(const char *events, const char *file) return false; } - trace_backend_init_events(events); return true; } -- cgit v1.2.3