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Tracing pull request 

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Merge remote-tracking branch 'stefanha/tags/tracing-pull-request' into staging

Tracing pull request

# gpg: Signature made Mon 27 Jan 2014 14:51:09 GMT using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* stefanha/tags/tracing-pull-request:
  trace: fix simple trace "disable" keyword
  trace: add glib 2.32+ static GMutex support
  trace: [simple] Do not include "trace/simple.h" in generated tracer headers
  tracing: start trace processing thread in final child process

Message-id: 1390834386-23139-1-git-send-email-stefanha@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2014-01-31 11:13:08 +00:00
parent 0159a64397 736ec1677f
commit 89e4a51ca9
3 changed files with 29 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
scripts/tracetool/backend/simple.py
View File

@ -56,7 +56,7 @@ def c(events):
out('',
' TraceEvent *eventp = trace_event_id(%(event_id)s);',
' TraceEvent *eventp = trace_event_id(%(event_enum)s);',
' bool _state = trace_event_get_state_dynamic(eventp);',
' if (!_state) {',
' return;',
@ -65,6 +65,7 @@ def c(events):
' if (trace_record_start(&rec, %(event_id)s, %(size_str)s)) {',
' return; /* Trace Buffer Full, Event Dropped ! */',
' }',
event_enum = 'TRACE_' + event.name.upper(),
event_id = num,
size_str = sizestr,
)
@ -93,9 +94,6 @@ def c(events):
def h(events):
out('#include "trace/simple.h"',
'')
for event in events:
out('void trace_%(name)s(%(args)s);',
name = event.name,

24
trace/simple.c
View File

@ -19,6 +19,7 @@
#include "qemu/timer.h"
#include "trace.h"
#include "trace/control.h"
#include "trace/simple.h"
/** Trace file header event ID */
#define HEADER_EVENT_ID (~(uint64_t)0) /* avoids conflicting with TraceEventIDs */
@ -39,7 +40,17 @@
* Trace records are written out by a dedicated thread. The thread waits for
* records to become available, writes them out, and then waits again.
*/
#if GLIB_CHECK_VERSION(2, 32, 0)
static GMutex trace_lock;
#define lock_trace_lock() g_mutex_lock(&trace_lock)
#define unlock_trace_lock() g_mutex_unlock(&trace_lock)
#define get_trace_lock_mutex() (&trace_lock)
#else
static GStaticMutex trace_lock = G_STATIC_MUTEX_INIT;
#define lock_trace_lock() g_static_mutex_lock(&trace_lock)
#define unlock_trace_lock() g_static_mutex_unlock(&trace_lock)
#define get_trace_lock_mutex() g_static_mutex_get_mutex(&trace_lock)
#endif
/* g_cond_new() was deprecated in glib 2.31 but we still need to support it */
#if GLIB_CHECK_VERSION(2, 31, 0)
@ -139,27 +150,26 @@ static bool get_trace_record(unsigned int idx, TraceRecord **recordptr)
*/
static void flush_trace_file(bool wait)
{
g_static_mutex_lock(&trace_lock);
lock_trace_lock();
trace_available = true;
g_cond_signal(trace_available_cond);
if (wait) {
g_cond_wait(trace_empty_cond, g_static_mutex_get_mutex(&trace_lock));
g_cond_wait(trace_empty_cond, get_trace_lock_mutex());
}
g_static_mutex_unlock(&trace_lock);
unlock_trace_lock();
}
static void wait_for_trace_records_available(void)
{
g_static_mutex_lock(&trace_lock);
lock_trace_lock();
while (!(trace_available && trace_writeout_enabled)) {
g_cond_signal(trace_empty_cond);
g_cond_wait(trace_available_cond,
g_static_mutex_get_mutex(&trace_lock));
g_cond_wait(trace_available_cond, get_trace_lock_mutex());
}
trace_available = false;
g_static_mutex_unlock(&trace_lock);
unlock_trace_lock();
}
static gpointer writeout_thread(gpointer opaque)

12
vl.c
View File

@ -3879,8 +3879,10 @@ int main(int argc, char **argv, char **envp)
qemu_set_log(mask);
}
if (!trace_backend_init(trace_events, trace_file)) {
exit(1);
if (!is_daemonized()) {
if (!trace_backend_init(trace_events, trace_file)) {
exit(1);
}
}
/* If no data_dir is specified then try to find it relative to the
@ -4379,6 +4381,12 @@ int main(int argc, char **argv, char **envp)
os_setup_post();
if (is_daemonized()) {
if (!trace_backend_init(trace_events, trace_file)) {
exit(1);
}
}
main_loop();
bdrv_close_all();
pause_all_vcpus();