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authorAnthony Liguori <aliguori@us.ibm.com>2012-07-23 13:15:34 -0500
committerAnthony Liguori <aliguori@us.ibm.com>2012-07-23 13:15:34 -0500
commit903f650b0c77827f8d92b35f61419401d648df1e (patch)
treec80095b5162b934286fbd44512e5b84d79bc7e53
parent61dc008f3529fa74a63aad1907438dad857e255a (diff)
parent90a147a275da3a432bdf00238ebf438eff1d2c1b (diff)
downloadqemu-arm-903f650b0c77827f8d92b35f61419401d648df1e.tar.gz
Merge remote-tracking branch 'stefanha/tracing' into staging
* stefanha/tracing: Update simpletrace.py for new log format Simpletrace v2: Support multiple arguments, strings. monitor: remove unused do_info_trace trace: added ability to comment out events in the list
-rw-r--r--monitor.c16
-rwxr-xr-xscripts/simpletrace.py116
-rw-r--r--scripts/tracetool/backend/simple.py90
-rw-r--r--trace/control.c3
-rw-r--r--trace/simple.c271
-rw-r--r--trace/simple.h40
6 files changed, 340 insertions, 196 deletions
diff --git a/monitor.c b/monitor.c
index 09aa3cdf52..49dccfe854 100644
--- a/monitor.c
+++ b/monitor.c
@@ -941,13 +941,6 @@ static void do_info_cpu_stats(Monitor *mon)
}
#endif
-#if defined(CONFIG_TRACE_SIMPLE)
-static void do_info_trace(Monitor *mon)
-{
- st_print_trace((FILE *)mon, &monitor_fprintf);
-}
-#endif
-
static void do_trace_print_events(Monitor *mon)
{
trace_print_events((FILE *)mon, &monitor_fprintf);
@@ -2689,15 +2682,6 @@ static mon_cmd_t info_cmds[] = {
.help = "show roms",
.mhandler.info = do_info_roms,
},
-#if defined(CONFIG_TRACE_SIMPLE)
- {
- .name = "trace",
- .args_type = "",
- .params = "",
- .help = "show current contents of trace buffer",
- .mhandler.info = do_info_trace,
- },
-#endif
{
.name = "trace-events",
.args_type = "",
diff --git a/scripts/simpletrace.py b/scripts/simpletrace.py
index f55e5e63f9..9b4419f7c3 100755
--- a/scripts/simpletrace.py
+++ b/scripts/simpletrace.py
@@ -12,53 +12,69 @@
import struct
import re
import inspect
+from tracetool import _read_events, Event
+from tracetool.backend.simple import is_string
header_event_id = 0xffffffffffffffff
header_magic = 0xf2b177cb0aa429b4
-header_version = 0
dropped_event_id = 0xfffffffffffffffe
-trace_fmt = '=QQQQQQQQ'
-trace_len = struct.calcsize(trace_fmt)
-event_re = re.compile(r'(disable\s+)?([a-zA-Z0-9_]+)\(([^)]*)\).*')
+log_header_fmt = '=QQQ'
+rec_header_fmt = '=QQII'
-def parse_events(fobj):
- """Parse a trace-events file into {event_num: (name, arg1, ...)}."""
-
- def get_argnames(args):
- """Extract argument names from a parameter list."""
- return tuple(arg.split()[-1].lstrip('*') for arg in args.split(','))
-
- events = {dropped_event_id: ('dropped', 'count')}
- event_num = 0
- for line in fobj:
- m = event_re.match(line.strip())
- if m is None:
- continue
-
- disable, name, args = m.groups()
- events[event_num] = (name,) + get_argnames(args)
- event_num += 1
- return events
+def read_header(fobj, hfmt):
+ '''Read a trace record header'''
+ hlen = struct.calcsize(hfmt)
+ hdr = fobj.read(hlen)
+ if len(hdr) != hlen:
+ return None
+ return struct.unpack(hfmt, hdr)
-def read_record(fobj):
+def get_record(edict, rechdr, fobj):
"""Deserialize a trace record from a file into a tuple (event_num, timestamp, arg1, ..., arg6)."""
- s = fobj.read(trace_len)
- if len(s) != trace_len:
+ if rechdr is None:
return None
- return struct.unpack(trace_fmt, s)
+ rec = (rechdr[0], rechdr[1])
+ if rechdr[0] != dropped_event_id:
+ event_id = rechdr[0]
+ event = edict[event_id]
+ for type, name in event.args:
+ if is_string(type):
+ l = fobj.read(4)
+ (len,) = struct.unpack('=L', l)
+ s = fobj.read(len)
+ rec = rec + (s,)
+ else:
+ (value,) = struct.unpack('=Q', fobj.read(8))
+ rec = rec + (value,)
+ else:
+ (value,) = struct.unpack('=Q', fobj.read(8))
+ rec = rec + (value,)
+ return rec
+
+
+def read_record(edict, fobj):
+ """Deserialize a trace record from a file into a tuple (event_num, timestamp, arg1, ..., arg6)."""
+ rechdr = read_header(fobj, rec_header_fmt)
+ return get_record(edict, rechdr, fobj) # return tuple of record elements
-def read_trace_file(fobj):
+def read_trace_file(edict, fobj):
"""Deserialize trace records from a file, yielding record tuples (event_num, timestamp, arg1, ..., arg6)."""
- header = read_record(fobj)
+ header = read_header(fobj, log_header_fmt)
if header is None or \
header[0] != header_event_id or \
- header[1] != header_magic or \
- header[2] != header_version:
- raise ValueError('not a trace file or incompatible version')
+ header[1] != header_magic:
+ raise ValueError('Not a valid trace file!')
+ if header[2] != 0 and \
+ header[2] != 2:
+ raise ValueError('Unknown version of tracelog format!')
+
+ log_version = header[2]
+ if log_version == 0:
+ raise ValueError('Older log format, not supported with this Qemu release!')
while True:
- rec = read_record(fobj)
+ rec = read_record(edict, fobj)
if rec is None:
break
@@ -89,16 +105,29 @@ class Analyzer(object):
def process(events, log, analyzer):
"""Invoke an analyzer on each event in a log."""
if isinstance(events, str):
- events = parse_events(open(events, 'r'))
+ events = _read_events(open(events, 'r'))
if isinstance(log, str):
log = open(log, 'rb')
+ enabled_events = []
+ dropped_event = Event.build("Dropped_Event(uint64_t num_events_dropped)")
+ edict = {dropped_event_id: dropped_event}
+
+ for e in events:
+ if 'disable' not in e.properties:
+ enabled_events.append(e)
+ for num, event in enumerate(enabled_events):
+ edict[num] = event
+
def build_fn(analyzer, event):
- fn = getattr(analyzer, event[0], None)
+ if isinstance(event, str):
+ return analyzer.catchall
+
+ fn = getattr(analyzer, event.name, None)
if fn is None:
return analyzer.catchall
- event_argcount = len(event) - 1
+ event_argcount = len(event.args)
fn_argcount = len(inspect.getargspec(fn)[0]) - 1
if fn_argcount == event_argcount + 1:
# Include timestamp as first argument
@@ -109,9 +138,9 @@ def process(events, log, analyzer):
analyzer.begin()
fn_cache = {}
- for rec in read_trace_file(log):
+ for rec in read_trace_file(edict, log):
event_num = rec[0]
- event = events[event_num]
+ event = edict[event_num]
if event_num not in fn_cache:
fn_cache[event_num] = build_fn(analyzer, event)
fn_cache[event_num](event, rec)
@@ -128,7 +157,7 @@ def run(analyzer):
sys.stderr.write('usage: %s <trace-events> <trace-file>\n' % sys.argv[0])
sys.exit(1)
- events = parse_events(open(sys.argv[1], 'r'))
+ events = _read_events(open(sys.argv[1], 'r'))
process(events, sys.argv[2], analyzer)
if __name__ == '__main__':
@@ -137,15 +166,20 @@ if __name__ == '__main__':
self.last_timestamp = None
def catchall(self, event, rec):
+ i = 1
timestamp = rec[1]
if self.last_timestamp is None:
self.last_timestamp = timestamp
delta_ns = timestamp - self.last_timestamp
self.last_timestamp = timestamp
- fields = [event[0], '%0.3f' % (delta_ns / 1000.0)]
- for i in xrange(1, len(event)):
- fields.append('%s=0x%x' % (event[i], rec[i + 1]))
+ fields = [event.name, '%0.3f' % (delta_ns / 1000.0)]
+ for type, name in event.args:
+ if is_string(type):
+ fields.append('%s=%s' % (name, rec[i + 1]))
+ else:
+ fields.append('%s=0x%x' % (name, rec[i + 1]))
+ i += 1
print ' '.join(fields)
run(Formatter())
diff --git a/scripts/tracetool/backend/simple.py b/scripts/tracetool/backend/simple.py
index fbb5717c66..c7e47d6d72 100644
--- a/scripts/tracetool/backend/simple.py
+++ b/scripts/tracetool/backend/simple.py
@@ -15,9 +15,16 @@ __email__ = "stefanha@linux.vnet.ibm.com"
from tracetool import out
+def is_string(arg):
+ strtype = ('const char*', 'char*', 'const char *', 'char *')
+ if arg.lstrip().startswith(strtype):
+ return True
+ else:
+ return False
def c(events):
out('#include "trace.h"',
+ '#include "trace/simple.h"',
'',
'TraceEvent trace_list[] = {')
@@ -26,30 +33,75 @@ def c(events):
name = e.name,
)
- out('};')
+ out('};',
+ '')
+
+ for num, event in enumerate(events):
+ out('void trace_%(name)s(%(args)s)',
+ '{',
+ ' TraceBufferRecord rec;',
+ name = event.name,
+ args = event.args,
+ )
+ sizes = []
+ for type_, name in event.args:
+ if is_string(type_):
+ out(' size_t arg%(name)s_len = %(name)s ? MIN(strlen(%(name)s), MAX_TRACE_STRLEN) : 0;',
+ name = name,
+ )
+ strsizeinfo = "4 + arg%s_len" % name
+ sizes.append(strsizeinfo)
+ else:
+ sizes.append("8")
+ sizestr = " + ".join(sizes)
+ if len(event.args) == 0:
+ sizestr = '0'
+
+
+ out('',
+ ' if (!trace_list[%(event_id)s].state) {',
+ ' return;',
+ ' }',
+ '',
+ ' if (trace_record_start(&rec, %(event_id)s, %(size_str)s)) {',
+ ' return; /* Trace Buffer Full, Event Dropped ! */',
+ ' }',
+ event_id = num,
+ size_str = sizestr,
+ )
+
+ if len(event.args) > 0:
+ for type_, name in event.args:
+ # string
+ if is_string(type_):
+ out(' trace_record_write_str(&rec, %(name)s, arg%(name)s_len);',
+ name = name,
+ )
+ # pointer var (not string)
+ elif type_.endswith('*'):
+ out(' trace_record_write_u64(&rec, (uint64_t)(uint64_t *)%(name)s);',
+ name = name,
+ )
+ # primitive data type
+ else:
+ out(' trace_record_write_u64(&rec, (uint64_t)%(name)s);',
+ name = name,
+ )
+
+ out(' trace_record_finish(&rec);',
+ '}',
+ '')
+
def h(events):
out('#include "trace/simple.h"',
'')
- for num, e in enumerate(events):
- if len(e.args):
- argstr = e.args.names()
- arg_prefix = ', (uint64_t)(uintptr_t)'
- cast_args = arg_prefix + arg_prefix.join(argstr)
- simple_args = (str(num) + cast_args)
- else:
- simple_args = str(num)
-
- out('static inline void trace_%(name)s(%(args)s)',
- '{',
- ' trace%(argc)d(%(trace_args)s);',
- '}',
- name = e.name,
- args = e.args,
- argc = len(e.args),
- trace_args = simple_args,
+ for event in events:
+ out('void trace_%(name)s(%(args)s);',
+ name = event.name,
+ args = event.args,
)
-
+ out('')
out('#define NR_TRACE_EVENTS %d' % len(events))
out('extern TraceEvent trace_list[NR_TRACE_EVENTS];')
diff --git a/trace/control.c b/trace/control.c
index 4c5527d20a..22d5863eeb 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -27,6 +27,9 @@ void trace_backend_init_events(const char *fname)
size_t len = strlen(line_buf);
if (len > 1) { /* skip empty lines */
line_buf[len - 1] = '\0';
+ if ('#' == line_buf[0]) { /* skip commented lines */
+ continue;
+ }
if (!trace_event_set_state(line_buf, true)) {
fprintf(stderr,
"error: trace event '%s' does not exist\n", line_buf);
diff --git a/trace/simple.c b/trace/simple.c
index b4a3c6e950..b700ea317c 100644
--- a/trace/simple.c
+++ b/trace/simple.c
@@ -27,7 +27,7 @@
#define HEADER_MAGIC 0xf2b177cb0aa429b4ULL
/** Trace file version number, bump if format changes */
-#define HEADER_VERSION 0
+#define HEADER_VERSION 2
/** Records were dropped event ID */
#define DROPPED_EVENT_ID (~(uint64_t)0 - 1)
@@ -35,23 +35,6 @@
/** Trace record is valid */
#define TRACE_RECORD_VALID ((uint64_t)1 << 63)
-/** Trace buffer entry */
-typedef struct {
- uint64_t event;
- uint64_t timestamp_ns;
- uint64_t x1;
- uint64_t x2;
- uint64_t x3;
- uint64_t x4;
- uint64_t x5;
- uint64_t x6;
-} TraceRecord;
-
-enum {
- TRACE_BUF_LEN = 4096,
- TRACE_BUF_FLUSH_THRESHOLD = TRACE_BUF_LEN / 4,
-};
-
/*
* Trace records are written out by a dedicated thread. The thread waits for
* records to become available, writes them out, and then waits again.
@@ -62,11 +45,48 @@ static GCond *trace_empty_cond;
static bool trace_available;
static bool trace_writeout_enabled;
-static TraceRecord trace_buf[TRACE_BUF_LEN];
+enum {
+ TRACE_BUF_LEN = 4096 * 64,
+ TRACE_BUF_FLUSH_THRESHOLD = TRACE_BUF_LEN / 4,
+};
+
+uint8_t trace_buf[TRACE_BUF_LEN];
static unsigned int trace_idx;
+static unsigned int writeout_idx;
+static uint64_t dropped_events;
static FILE *trace_fp;
static char *trace_file_name = NULL;
+/* * Trace buffer entry */
+typedef struct {
+ uint64_t event; /* TraceEventID */
+ uint64_t timestamp_ns;
+ uint32_t length; /* in bytes */
+ uint32_t reserved; /* unused */
+ uint8_t arguments[];
+} TraceRecord;
+
+typedef struct {
+ uint64_t header_event_id; /* HEADER_EVENT_ID */
+ uint64_t header_magic; /* HEADER_MAGIC */
+ uint64_t header_version; /* HEADER_VERSION */
+} TraceRecordHeader;
+
+
+static void read_from_buffer(unsigned int idx, void *dataptr, size_t size);
+static unsigned int write_to_buffer(unsigned int idx, void *dataptr, size_t size);
+
+static void clear_buffer_range(unsigned int idx, size_t len)
+{
+ uint32_t num = 0;
+ while (num < len) {
+ if (idx >= TRACE_BUF_LEN) {
+ idx = idx % TRACE_BUF_LEN;
+ }
+ trace_buf[idx++] = 0;
+ num++;
+ }
+}
/**
* Read a trace record from the trace buffer
*
@@ -75,16 +95,30 @@ static char *trace_file_name = NULL;
*
* Returns false if the record is not valid.
*/
-static bool get_trace_record(unsigned int idx, TraceRecord *record)
+static bool get_trace_record(unsigned int idx, TraceRecord **recordptr)
{
- if (!(trace_buf[idx].event & TRACE_RECORD_VALID)) {
+ uint64_t event_flag = 0;
+ TraceRecord record;
+ /* read the event flag to see if its a valid record */
+ read_from_buffer(idx, &record, sizeof(event_flag));
+
+ if (!(record.event & TRACE_RECORD_VALID)) {
return false;
}
- __sync_synchronize(); /* read memory barrier before accessing record */
-
- *record = trace_buf[idx];
- record->event &= ~TRACE_RECORD_VALID;
+ smp_rmb(); /* read memory barrier before accessing record */
+ /* read the record header to know record length */
+ read_from_buffer(idx, &record, sizeof(TraceRecord));
+ *recordptr = malloc(record.length); /* dont use g_malloc, can deadlock when traced */
+ /* make a copy of record to avoid being overwritten */
+ read_from_buffer(idx, *recordptr, record.length);
+ smp_rmb(); /* memory barrier before clearing valid flag */
+ (*recordptr)->event &= ~TRACE_RECORD_VALID;
+ /* clear the trace buffer range for consumed record otherwise any byte
+ * with its MSB set may be considered as a valid event id when the writer
+ * thread crosses this range of buffer again.
+ */
+ clear_buffer_range(idx, record.length);
return true;
}
@@ -120,29 +154,39 @@ static void wait_for_trace_records_available(void)
static gpointer writeout_thread(gpointer opaque)
{
- TraceRecord record;
- unsigned int writeout_idx = 0;
- unsigned int num_available, idx;
+ TraceRecord *recordptr;
+ union {
+ TraceRecord rec;
+ uint8_t bytes[sizeof(TraceRecord) + sizeof(uint64_t)];
+ } dropped;
+ unsigned int idx = 0;
+ uint64_t dropped_count;
size_t unused __attribute__ ((unused));
for (;;) {
wait_for_trace_records_available();
- num_available = trace_idx - writeout_idx;
- if (num_available > TRACE_BUF_LEN) {
- record = (TraceRecord){
- .event = DROPPED_EVENT_ID,
- .x1 = num_available,
- };
- unused = fwrite(&record, sizeof(record), 1, trace_fp);
- writeout_idx += num_available;
+ if (dropped_events) {
+ dropped.rec.event = DROPPED_EVENT_ID,
+ dropped.rec.timestamp_ns = get_clock();
+ dropped.rec.length = sizeof(TraceRecord) + sizeof(dropped_events),
+ dropped.rec.reserved = 0;
+ while (1) {
+ dropped_count = dropped_events;
+ if (g_atomic_int_compare_and_exchange((gint *)&dropped_events,
+ dropped_count, 0)) {
+ break;
+ }
+ }
+ memcpy(dropped.rec.arguments, &dropped_count, sizeof(uint64_t));
+ unused = fwrite(&dropped.rec, dropped.rec.length, 1, trace_fp);
}
- idx = writeout_idx % TRACE_BUF_LEN;
- while (get_trace_record(idx, &record)) {
- trace_buf[idx].event = 0; /* clear valid bit */
- unused = fwrite(&record, sizeof(record), 1, trace_fp);
- idx = ++writeout_idx % TRACE_BUF_LEN;
+ while (get_trace_record(idx, &recordptr)) {
+ unused = fwrite(recordptr, recordptr->length, 1, trace_fp);
+ writeout_idx += recordptr->length;
+ free(recordptr); /* dont use g_free, can deadlock when traced */
+ idx = writeout_idx % TRACE_BUF_LEN;
}
fflush(trace_fp);
@@ -150,73 +194,93 @@ static gpointer writeout_thread(gpointer opaque)
return NULL;
}
-static void trace(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3,
- uint64_t x4, uint64_t x5, uint64_t x6)
+void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val)
{
- unsigned int idx;
- uint64_t timestamp;
-
- if (!trace_list[event].state) {
- return;
- }
-
- timestamp = get_clock();
-#if GLIB_CHECK_VERSION(2, 30, 0)
- idx = g_atomic_int_add((gint *)&trace_idx, 1) % TRACE_BUF_LEN;
-#else
- idx = g_atomic_int_exchange_and_add((gint *)&trace_idx, 1) % TRACE_BUF_LEN;
-#endif
- trace_buf[idx] = (TraceRecord){
- .event = event,
- .timestamp_ns = timestamp,
- .x1 = x1,
- .x2 = x2,
- .x3 = x3,
- .x4 = x4,
- .x5 = x5,
- .x6 = x6,
- };
- __sync_synchronize(); /* write barrier before marking as valid */
- trace_buf[idx].event |= TRACE_RECORD_VALID;
-
- if ((idx + 1) % TRACE_BUF_FLUSH_THRESHOLD == 0) {
- flush_trace_file(false);
- }
+ rec->rec_off = write_to_buffer(rec->rec_off, &val, sizeof(uint64_t));
}
-void trace0(TraceEventID event)
+void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen)
{
- trace(event, 0, 0, 0, 0, 0, 0);
+ /* Write string length first */
+ rec->rec_off = write_to_buffer(rec->rec_off, &slen, sizeof(slen));
+ /* Write actual string now */
+ rec->rec_off = write_to_buffer(rec->rec_off, (void*)s, slen);
}
-void trace1(TraceEventID event, uint64_t x1)
+int trace_record_start(TraceBufferRecord *rec, TraceEventID event, size_t datasize)
{
- trace(event, x1, 0, 0, 0, 0, 0);
-}
+ unsigned int idx, rec_off, old_idx, new_idx;
+ uint32_t rec_len = sizeof(TraceRecord) + datasize;
+ uint64_t timestamp_ns = get_clock();
+
+ while (1) {
+ old_idx = trace_idx;
+ smp_rmb();
+ new_idx = old_idx + rec_len;
+
+ if (new_idx - writeout_idx > TRACE_BUF_LEN) {
+ /* Trace Buffer Full, Event dropped ! */
+ g_atomic_int_inc((gint *)&dropped_events);
+ return -ENOSPC;
+ }
-void trace2(TraceEventID event, uint64_t x1, uint64_t x2)
-{
- trace(event, x1, x2, 0, 0, 0, 0);
-}
+ if (g_atomic_int_compare_and_exchange((gint *)&trace_idx,
+ old_idx, new_idx)) {
+ break;
+ }
+ }
-void trace3(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3)
-{
- trace(event, x1, x2, x3, 0, 0, 0);
+ idx = old_idx % TRACE_BUF_LEN;
+ /* To check later if threshold crossed */
+ rec->next_tbuf_idx = new_idx % TRACE_BUF_LEN;
+
+ rec_off = idx;
+ rec_off = write_to_buffer(rec_off, (uint8_t*)&event, sizeof(event));
+ rec_off = write_to_buffer(rec_off, (uint8_t*)&timestamp_ns, sizeof(timestamp_ns));
+ rec_off = write_to_buffer(rec_off, (uint8_t*)&rec_len, sizeof(rec_len));
+
+ rec->tbuf_idx = idx;
+ rec->rec_off = (idx + sizeof(TraceRecord)) % TRACE_BUF_LEN;
+ return 0;
}
-void trace4(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4)
+static void read_from_buffer(unsigned int idx, void *dataptr, size_t size)
{
- trace(event, x1, x2, x3, x4, 0, 0);
+ uint8_t *data_ptr = dataptr;
+ uint32_t x = 0;
+ while (x < size) {
+ if (idx >= TRACE_BUF_LEN) {
+ idx = idx % TRACE_BUF_LEN;
+ }
+ data_ptr[x++] = trace_buf[idx++];
+ }
}
-void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5)
+static unsigned int write_to_buffer(unsigned int idx, void *dataptr, size_t size)
{
- trace(event, x1, x2, x3, x4, x5, 0);
+ uint8_t *data_ptr = dataptr;
+ uint32_t x = 0;
+ while (x < size) {
+ if (idx >= TRACE_BUF_LEN) {
+ idx = idx % TRACE_BUF_LEN;
+ }
+ trace_buf[idx++] = data_ptr[x++];
+ }
+ return idx; /* most callers wants to know where to write next */
}
-void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6)
+void trace_record_finish(TraceBufferRecord *rec)
{
- trace(event, x1, x2, x3, x4, x5, x6);
+ uint8_t temp_rec[sizeof(TraceRecord)];
+ TraceRecord *record = (TraceRecord *) temp_rec;
+ read_from_buffer(rec->tbuf_idx, temp_rec, sizeof(TraceRecord));
+ smp_wmb(); /* write barrier before marking as valid */
+ record->event |= TRACE_RECORD_VALID;
+ write_to_buffer(rec->tbuf_idx, temp_rec, sizeof(TraceRecord));
+
+ if ((trace_idx - writeout_idx) > TRACE_BUF_FLUSH_THRESHOLD) {
+ flush_trace_file(false);
+ }
}
void st_set_trace_file_enabled(bool enable)
@@ -231,10 +295,11 @@ void st_set_trace_file_enabled(bool enable)
flush_trace_file(true);
if (enable) {
- static const TraceRecord header = {
- .event = HEADER_EVENT_ID,
- .timestamp_ns = HEADER_MAGIC,
- .x1 = HEADER_VERSION,
+ static const TraceRecordHeader header = {
+ .header_event_id = HEADER_EVENT_ID,
+ .header_magic = HEADER_MAGIC,
+ /* Older log readers will check for version at next location */
+ .header_version = HEADER_VERSION,
};
trace_fp = fopen(trace_file_name, "wb");
@@ -291,24 +356,6 @@ void st_print_trace_file_status(FILE *stream, int (*stream_printf)(FILE *stream,
trace_file_name, trace_fp ? "on" : "off");
}
-void st_print_trace(FILE *stream, int (*stream_printf)(FILE *stream, const char *fmt, ...))
-{
- unsigned int i;
-
- for (i = 0; i < TRACE_BUF_LEN; i++) {
- TraceRecord record;
-
- if (!get_trace_record(i, &record)) {
- continue;
- }
- stream_printf(stream, "Event %" PRIu64 " : %" PRIx64 " %" PRIx64
- " %" PRIx64 " %" PRIx64 " %" PRIx64 " %" PRIx64 "\n",
- record.event, record.x1, record.x2,
- record.x3, record.x4, record.x5,
- record.x6);
- }
-}
-
void st_flush_trace_buffer(void)
{
flush_trace_file(true);
diff --git a/trace/simple.h b/trace/simple.h
index 466e75b4ff..7e521c1e1f 100644
--- a/trace/simple.h
+++ b/trace/simple.h
@@ -22,17 +22,41 @@ typedef struct {
bool state;
} TraceEvent;
-void trace0(TraceEventID event);
-void trace1(TraceEventID event, uint64_t x1);
-void trace2(TraceEventID event, uint64_t x1, uint64_t x2);
-void trace3(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3);
-void trace4(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4);
-void trace5(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5);
-void trace6(TraceEventID event, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4, uint64_t x5, uint64_t x6);
-void st_print_trace(FILE *stream, fprintf_function stream_printf);
void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
void st_set_trace_file_enabled(bool enable);
bool st_set_trace_file(const char *file);
void st_flush_trace_buffer(void);
+typedef struct {
+ unsigned int tbuf_idx;
+ unsigned int next_tbuf_idx;
+ unsigned int rec_off;
+} TraceBufferRecord;
+
+/* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */
+#define MAX_TRACE_STRLEN 512
+/**
+ * Initialize a trace record and claim space for it in the buffer
+ *
+ * @arglen number of bytes required for arguments
+ */
+int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen);
+
+/**
+ * Append a 64-bit argument to a trace record
+ */
+void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val);
+
+/**
+ * Append a string argument to a trace record
+ */
+void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen);
+
+/**
+ * Mark a trace record completed
+ *
+ * Don't append any more arguments to the trace record after calling this.
+ */
+void trace_record_finish(TraceBufferRecord *rec);
+
#endif /* TRACE_SIMPLE_H */