attr.log_level = 0;
attr.kern_version = 0;
- attr = attr;
/*
* Test existence of __NR_bpf and BPF_PROG_LOAD.
* This call should fail if we run the testcase.
*/
- return syscall(__NR_bpf, BPF_PROG_LOAD, attr, sizeof(attr));
+ return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
}
--all-user::
Configure all used events to run in user space.
+--timestamp-filename
+Append timestamp to output file name.
+
+--switch-output::
+Generate multiple perf.data files, timestamp prefixed, switching to a new one
+when receiving a SIGUSR2.
+
+A possible use case is to, given an external event, slice the perf.data file
+that gets then processed, possibly via a perf script, to decide if that
+particular perf.data snapshot should be kept or not.
+
+Implies --timestamp-filename, --no-buildid and --no-buildid-cache.
+
SEE ALSO
--------
linkperf:perf-stat[1], linkperf:perf-list[1]
#include "util/parse-regs-options.h"
#include "util/llvm-utils.h"
#include "util/bpf-loader.h"
+#include "util/trigger.h"
#include "asm/bug.h"
#include <unistd.h>
bool no_buildid_cache_set;
bool buildid_all;
bool timestamp_filename;
+ bool switch_output;
unsigned long long samples;
};
static volatile int signr = -1;
static volatile int child_finished;
-static volatile enum {
- AUXTRACE_SNAPSHOT_OFF = -1,
- AUXTRACE_SNAPSHOT_DISABLED = 0,
- AUXTRACE_SNAPSHOT_ENABLED = 1,
-} auxtrace_snapshot_state = AUXTRACE_SNAPSHOT_OFF;
-
-static inline void
-auxtrace_snapshot_on(void)
-{
- auxtrace_snapshot_state = AUXTRACE_SNAPSHOT_DISABLED;
-}
-
-static inline void
-auxtrace_snapshot_enable(void)
-{
- if (auxtrace_snapshot_state == AUXTRACE_SNAPSHOT_OFF)
- return;
- auxtrace_snapshot_state = AUXTRACE_SNAPSHOT_ENABLED;
-}
-
-static inline void
-auxtrace_snapshot_disable(void)
-{
- if (auxtrace_snapshot_state == AUXTRACE_SNAPSHOT_OFF)
- return;
- auxtrace_snapshot_state = AUXTRACE_SNAPSHOT_DISABLED;
-}
-
-static inline bool
-auxtrace_snapshot_is_enabled(void)
-{
- if (auxtrace_snapshot_state == AUXTRACE_SNAPSHOT_OFF)
- return false;
- return auxtrace_snapshot_state == AUXTRACE_SNAPSHOT_ENABLED;
-}
-
-static volatile int auxtrace_snapshot_err;
static volatile int auxtrace_record__snapshot_started;
+static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
+static DEFINE_TRIGGER(switch_output_trigger);
static void sig_handler(int sig)
{
{
pr_debug("Recording AUX area tracing snapshot\n");
if (record__auxtrace_read_snapshot_all(rec) < 0) {
- auxtrace_snapshot_err = -1;
+ trigger_error(&auxtrace_snapshot_trigger);
} else {
- auxtrace_snapshot_err = auxtrace_record__snapshot_finish(rec->itr);
- if (!auxtrace_snapshot_err)
- auxtrace_snapshot_enable();
+ if (auxtrace_record__snapshot_finish(rec->itr))
+ trigger_error(&auxtrace_snapshot_trigger);
+ else
+ trigger_ready(&auxtrace_snapshot_trigger);
}
}
return;
}
+static int record__synthesize_workload(struct record *rec)
+{
+ struct {
+ struct thread_map map;
+ struct thread_map_data map_data;
+ } thread_map;
+
+ thread_map.map.nr = 1;
+ thread_map.map.map[0].pid = rec->evlist->workload.pid;
+ thread_map.map.map[0].comm = NULL;
+ return perf_event__synthesize_thread_map(&rec->tool, &thread_map.map,
+ process_synthesized_event,
+ &rec->session->machines.host,
+ rec->opts.sample_address,
+ rec->opts.proc_map_timeout);
+}
+
+static int record__synthesize(struct record *rec);
+
static int
record__switch_output(struct record *rec, bool at_exit)
{
if (!quiet)
fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
file->path, timestamp);
+
+ /* Output tracking events */
+ if (!at_exit) {
+ record__synthesize(rec);
+
+ /*
+ * In 'perf record --switch-output' without -a,
+ * record__synthesize() in record__switch_output() won't
+ * generate tracking events because there's no thread_map
+ * in evlist. Which causes newly created perf.data doesn't
+ * contain map and comm information.
+ * Create a fake thread_map and directly call
+ * perf_event__synthesize_thread_map() for those events.
+ */
+ if (target__none(&rec->opts.target))
+ record__synthesize_workload(rec);
+ }
return fd;
}
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
- if (rec->opts.auxtrace_snapshot_mode) {
+ if (rec->opts.auxtrace_snapshot_mode || rec->switch_output) {
signal(SIGUSR2, snapshot_sig_handler);
- auxtrace_snapshot_on();
+ if (rec->opts.auxtrace_snapshot_mode)
+ trigger_on(&auxtrace_snapshot_trigger);
+ if (rec->switch_output)
+ trigger_on(&switch_output_trigger);
} else {
signal(SIGUSR2, SIG_IGN);
}
perf_evlist__enable(rec->evlist);
}
- auxtrace_snapshot_enable();
+ trigger_ready(&auxtrace_snapshot_trigger);
+ trigger_ready(&switch_output_trigger);
for (;;) {
unsigned long long hits = rec->samples;
if (record__mmap_read_all(rec) < 0) {
- auxtrace_snapshot_disable();
+ trigger_error(&auxtrace_snapshot_trigger);
+ trigger_error(&switch_output_trigger);
err = -1;
goto out_child;
}
if (auxtrace_record__snapshot_started) {
auxtrace_record__snapshot_started = 0;
- if (!auxtrace_snapshot_err)
+ if (!trigger_is_error(&auxtrace_snapshot_trigger))
record__read_auxtrace_snapshot(rec);
- if (auxtrace_snapshot_err) {
+ if (trigger_is_error(&auxtrace_snapshot_trigger)) {
pr_err("AUX area tracing snapshot failed\n");
err = -1;
goto out_child;
}
}
+ if (trigger_is_hit(&switch_output_trigger)) {
+ trigger_ready(&switch_output_trigger);
+
+ if (!quiet)
+ fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
+ waking);
+ waking = 0;
+ fd = record__switch_output(rec, false);
+ if (fd < 0) {
+ pr_err("Failed to switch to new file\n");
+ trigger_error(&switch_output_trigger);
+ err = fd;
+ goto out_child;
+ }
+ }
+
if (hits == rec->samples) {
if (done || draining)
break;
* disable events in this case.
*/
if (done && !disabled && !target__none(&opts->target)) {
- auxtrace_snapshot_disable();
+ trigger_off(&auxtrace_snapshot_trigger);
perf_evlist__disable(rec->evlist);
disabled = true;
}
}
- auxtrace_snapshot_disable();
+ trigger_off(&auxtrace_snapshot_trigger);
+ trigger_off(&switch_output_trigger);
if (forks && workload_exec_errno) {
char msg[STRERR_BUFSIZE];
"Record build-id of all DSOs regardless of hits"),
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
"append timestamp to output filename"),
+ OPT_BOOLEAN(0, "switch-output", &record.switch_output,
+ "Switch output when receive SIGUSR2"),
OPT_END()
};
return -EINVAL;
}
+ if (rec->switch_output)
+ rec->timestamp_filename = true;
+
if (!rec->itr) {
rec->itr = auxtrace_record__init(rec->evlist, &err);
if (err)
"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
"even with a suitable vmlinux or kallsyms file.\n\n");
- if (rec->no_buildid_cache || rec->no_buildid)
+ if (rec->no_buildid_cache || rec->no_buildid) {
disable_buildid_cache();
+ } else if (rec->switch_output) {
+ /*
+ * In 'perf record --switch-output', disable buildid
+ * generation by default to reduce data file switching
+ * overhead. Still generate buildid if they are required
+ * explicitly using
+ *
+ * perf record --signal-trigger --no-no-buildid \
+ * --no-no-buildid-cache
+ *
+ * Following code equals to:
+ *
+ * if ((rec->no_buildid || !rec->no_buildid_set) &&
+ * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
+ * disable_buildid_cache();
+ */
+ bool disable = true;
+
+ if (rec->no_buildid_set && !rec->no_buildid)
+ disable = false;
+ if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
+ disable = false;
+ if (disable) {
+ rec->no_buildid = true;
+ rec->no_buildid_cache = true;
+ disable_buildid_cache();
+ }
+ }
if (rec->evlist->nr_entries == 0 &&
perf_evlist__add_default(rec->evlist) < 0) {
static void snapshot_sig_handler(int sig __maybe_unused)
{
- if (!auxtrace_snapshot_is_enabled())
- return;
- auxtrace_snapshot_disable();
- auxtrace_snapshot_err = auxtrace_record__snapshot_start(record.itr);
- auxtrace_record__snapshot_started = 1;
+ if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
+ trigger_hit(&auxtrace_snapshot_trigger);
+ auxtrace_record__snapshot_started = 1;
+ if (auxtrace_record__snapshot_start(record.itr))
+ trigger_error(&auxtrace_snapshot_trigger);
+ }
+
+ if (trigger_is_ready(&switch_output_trigger))
+ trigger_hit(&switch_output_trigger);
}
# define O_CLOEXEC 02000000
#endif
-#ifndef MSG_CMSG_CLOEXEC
-# define MSG_CMSG_CLOEXEC 0x40000000
-#endif
-
struct trace {
struct perf_tool tool;
struct syscalltbl *sctbl;
};
static DEFINE_STRARRAY(socket_families);
-#ifndef MSG_PROBE
-#define MSG_PROBE 0x10
-#endif
-#ifndef MSG_WAITFORONE
-#define MSG_WAITFORONE 0x10000
-#endif
-#ifndef MSG_SENDPAGE_NOTLAST
-#define MSG_SENDPAGE_NOTLAST 0x20000
-#endif
-#ifndef MSG_FASTOPEN
-#define MSG_FASTOPEN 0x20000000
-#endif
-
-static size_t syscall_arg__scnprintf_msg_flags(char *bf, size_t size,
- struct syscall_arg *arg)
-{
- int printed = 0, flags = arg->val;
-
- if (flags == 0)
- return scnprintf(bf, size, "NONE");
-#define P_MSG_FLAG(n) \
- if (flags & MSG_##n) { \
- printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
- flags &= ~MSG_##n; \
- }
-
- P_MSG_FLAG(OOB);
- P_MSG_FLAG(PEEK);
- P_MSG_FLAG(DONTROUTE);
- P_MSG_FLAG(TRYHARD);
- P_MSG_FLAG(CTRUNC);
- P_MSG_FLAG(PROBE);
- P_MSG_FLAG(TRUNC);
- P_MSG_FLAG(DONTWAIT);
- P_MSG_FLAG(EOR);
- P_MSG_FLAG(WAITALL);
- P_MSG_FLAG(FIN);
- P_MSG_FLAG(SYN);
- P_MSG_FLAG(CONFIRM);
- P_MSG_FLAG(RST);
- P_MSG_FLAG(ERRQUEUE);
- P_MSG_FLAG(NOSIGNAL);
- P_MSG_FLAG(MORE);
- P_MSG_FLAG(WAITFORONE);
- P_MSG_FLAG(SENDPAGE_NOTLAST);
- P_MSG_FLAG(FASTOPEN);
- P_MSG_FLAG(CMSG_CLOEXEC);
-#undef P_MSG_FLAG
-
- if (flags)
- printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
-
- return printed;
-}
-
-#define SCA_MSG_FLAGS syscall_arg__scnprintf_msg_flags
-
static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,
struct syscall_arg *arg)
{
#include "trace/beauty/pid.c"
#include "trace/beauty/mmap.c"
#include "trace/beauty/mode_t.c"
+#include "trace/beauty/msg_flags.c"
#include "trace/beauty/perf_event_open.c"
#include "trace/beauty/sched_policy.c"
#include "trace/beauty/socket_type.c"
{
int i;
- dsos = malloc(sizeof(dsos) * cnt);
+ dsos = malloc(sizeof(*dsos) * cnt);
TEST_ASSERT_VAL("failed to alloc dsos array", dsos);
for (i = 0; i < cnt; i++) {
--- /dev/null
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#ifndef MSG_PROBE
+#define MSG_PROBE 0x10
+#endif
+#ifndef MSG_WAITFORONE
+#define MSG_WAITFORONE 0x10000
+#endif
+#ifndef MSG_SENDPAGE_NOTLAST
+#define MSG_SENDPAGE_NOTLAST 0x20000
+#endif
+#ifndef MSG_FASTOPEN
+#define MSG_FASTOPEN 0x20000000
+#endif
+#ifndef MSG_CMSG_CLOEXEC
+# define MSG_CMSG_CLOEXEC 0x40000000
+#endif
+
+static size_t syscall_arg__scnprintf_msg_flags(char *bf, size_t size,
+ struct syscall_arg *arg)
+{
+ int printed = 0, flags = arg->val;
+
+ if (flags == 0)
+ return scnprintf(bf, size, "NONE");
+#define P_MSG_FLAG(n) \
+ if (flags & MSG_##n) { \
+ printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
+ flags &= ~MSG_##n; \
+ }
+
+ P_MSG_FLAG(OOB);
+ P_MSG_FLAG(PEEK);
+ P_MSG_FLAG(DONTROUTE);
+ P_MSG_FLAG(TRYHARD);
+ P_MSG_FLAG(CTRUNC);
+ P_MSG_FLAG(PROBE);
+ P_MSG_FLAG(TRUNC);
+ P_MSG_FLAG(DONTWAIT);
+ P_MSG_FLAG(EOR);
+ P_MSG_FLAG(WAITALL);
+ P_MSG_FLAG(FIN);
+ P_MSG_FLAG(SYN);
+ P_MSG_FLAG(CONFIRM);
+ P_MSG_FLAG(RST);
+ P_MSG_FLAG(ERRQUEUE);
+ P_MSG_FLAG(NOSIGNAL);
+ P_MSG_FLAG(MORE);
+ P_MSG_FLAG(WAITFORONE);
+ P_MSG_FLAG(SENDPAGE_NOTLAST);
+ P_MSG_FLAG(FASTOPEN);
+ P_MSG_FLAG(CMSG_CLOEXEC);
+#undef P_MSG_FLAG
+
+ if (flags)
+ printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
+
+ return printed;
+}
+
+#define SCA_MSG_FLAGS syscall_arg__scnprintf_msg_flags
"Probably the maximum number of open file descriptors has been reached.\n"
"Hint: Try again after reducing the number of events.\n"
"Hint: Try increasing the limit with 'ulimit -n <limit>'");
+ case ENOMEM:
+ if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
+ access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
+ return scnprintf(msg, size,
+ "Not enough memory to setup event with callchain.\n"
+ "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
+ "Hint: Current value: %d", sysctl_perf_event_max_stack);
+ break;
case ENODEV:
if (target->cpu_list)
return scnprintf(msg, size, "%s",
- "No such device - did you specify an out-of-range profile CPU?\n");
+ "No such device - did you specify an out-of-range profile CPU?");
break;
case EOPNOTSUPP:
if (evsel->attr.precise_ip)
return scnprintf(msg, size,
"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
"/bin/dmesg may provide additional information.\n"
- "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
+ "No CONFIG_PERF_EVENTS=y kernel support configured?",
err, strerror_r(err, sbuf, sizeof(sbuf)),
perf_evsel__name(evsel));
}
}
/* Compose only probe arg */
-int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
+char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
{
struct perf_probe_arg_field *field = pa->field;
- int ret;
- char *tmp = buf;
+ struct strbuf buf;
+ char *ret;
+ strbuf_init(&buf, 64);
if (pa->name && pa->var)
- ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
+ strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
else
- ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
- if (ret <= 0)
- goto error;
- tmp += ret;
- len -= ret;
+ strbuf_addstr(&buf, pa->name ?: pa->var);
while (field) {
if (field->name[0] == '[')
- ret = e_snprintf(tmp, len, "%s", field->name);
+ strbuf_addstr(&buf, field->name);
else
- ret = e_snprintf(tmp, len, "%s%s",
- field->ref ? "->" : ".", field->name);
- if (ret <= 0)
- goto error;
- tmp += ret;
- len -= ret;
+ strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
+ field->name);
field = field->next;
}
- if (pa->type) {
- ret = e_snprintf(tmp, len, ":%s", pa->type);
- if (ret <= 0)
- goto error;
- tmp += ret;
- len -= ret;
- }
+ if (pa->type)
+ strbuf_addf(&buf, ":%s", pa->type);
+
+ ret = strbuf_detach(&buf, NULL);
- return tmp - buf;
-error:
- pr_debug("Failed to synthesize perf probe argument: %d\n", ret);
return ret;
}
/* Compose only probe point (not argument) */
static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
{
- char *buf, *tmp;
- char offs[32] = "", line[32] = "", file[32] = "";
- int ret, len;
-
- buf = zalloc(MAX_CMDLEN);
- if (buf == NULL) {
- ret = -ENOMEM;
- goto error;
- }
- if (pp->offset) {
- ret = e_snprintf(offs, 32, "+%lu", pp->offset);
- if (ret <= 0)
- goto error;
- }
- if (pp->line) {
- ret = e_snprintf(line, 32, ":%d", pp->line);
- if (ret <= 0)
- goto error;
+ struct strbuf buf;
+ char *tmp;
+ int len;
+
+ strbuf_init(&buf, 64);
+ if (pp->function) {
+ strbuf_addstr(&buf, pp->function);
+ if (pp->offset)
+ strbuf_addf(&buf, "+%lu", pp->offset);
+ else if (pp->line)
+ strbuf_addf(&buf, ":%d", pp->line);
+ else if (pp->retprobe)
+ strbuf_addstr(&buf, "%return");
}
if (pp->file) {
tmp = pp->file;
tmp = strchr(pp->file + len - 30, '/');
tmp = tmp ? tmp + 1 : pp->file + len - 30;
}
- ret = e_snprintf(file, 32, "@%s", tmp);
- if (ret <= 0)
- goto error;
+ strbuf_addf(&buf, "@%s", tmp);
+ if (!pp->function && pp->line)
+ strbuf_addf(&buf, ":%d", pp->line);
}
- if (pp->function)
- ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
- offs, pp->retprobe ? "%return" : "", line,
- file);
- else
- ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
- if (ret <= 0)
- goto error;
-
- return buf;
-error:
- pr_debug("Failed to synthesize perf probe point: %d\n", ret);
- free(buf);
- return NULL;
+ return strbuf_detach(&buf, NULL);
}
#if 0
#endif
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
- char **buf, size_t *buflen,
- int depth)
+ struct strbuf *buf, int depth)
{
- int ret;
if (ref->next) {
depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
- buflen, depth + 1);
+ depth + 1);
if (depth < 0)
goto out;
}
-
- ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
- if (ret < 0)
- depth = ret;
- else {
- *buf += ret;
- *buflen -= ret;
- }
+ strbuf_addf(buf, "%+ld(", ref->offset);
out:
return depth;
-
}
static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
- char *buf, size_t buflen)
+ struct strbuf *buf)
{
struct probe_trace_arg_ref *ref = arg->ref;
- int ret, depth = 0;
- char *tmp = buf;
+ int depth = 0;
/* Argument name or separator */
if (arg->name)
- ret = e_snprintf(buf, buflen, " %s=", arg->name);
+ strbuf_addf(buf, " %s=", arg->name);
else
- ret = e_snprintf(buf, buflen, " ");
- if (ret < 0)
- return ret;
- buf += ret;
- buflen -= ret;
+ strbuf_addch(buf, ' ');
/* Special case: @XXX */
if (arg->value[0] == '@' && arg->ref)
/* Dereferencing arguments */
if (ref) {
- depth = __synthesize_probe_trace_arg_ref(ref, &buf,
- &buflen, 1);
+ depth = __synthesize_probe_trace_arg_ref(ref, buf, 1);
if (depth < 0)
return depth;
}
/* Print argument value */
if (arg->value[0] == '@' && arg->ref)
- ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
- arg->ref->offset);
+ strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
else
- ret = e_snprintf(buf, buflen, "%s", arg->value);
- if (ret < 0)
- return ret;
- buf += ret;
- buflen -= ret;
+ strbuf_addstr(buf, arg->value);
/* Closing */
- while (depth--) {
- ret = e_snprintf(buf, buflen, ")");
- if (ret < 0)
- return ret;
- buf += ret;
- buflen -= ret;
- }
+ while (depth--)
+ strbuf_addch(buf, ')');
/* Print argument type */
- if (arg->type) {
- ret = e_snprintf(buf, buflen, ":%s", arg->type);
- if (ret <= 0)
- return ret;
- buf += ret;
- }
+ if (arg->type)
+ strbuf_addf(buf, ":%s", arg->type);
- return buf - tmp;
+ return 0;
}
char *synthesize_probe_trace_command(struct probe_trace_event *tev)
{
struct probe_trace_point *tp = &tev->point;
- char *buf;
- int i, len, ret;
-
- buf = zalloc(MAX_CMDLEN);
- if (buf == NULL)
- return NULL;
-
- len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
- tev->group, tev->event);
- if (len <= 0)
- goto error;
+ struct strbuf buf;
+ char *ret = NULL;
+ int i;
/* Uprobes must have tp->module */
if (tev->uprobes && !tp->module)
- goto error;
+ return NULL;
+
+ strbuf_init(&buf, 32);
+ strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
+ tev->group, tev->event);
/*
* If tp->address == 0, then this point must be a
* absolute address uprobe.
/* Use the tp->address for uprobes */
if (tev->uprobes)
- ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s:0x%lx",
- tp->module, tp->address);
+ strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
else if (!strncmp(tp->symbol, "0x", 2))
/* Absolute address. See try_to_find_absolute_address() */
- ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s0x%lx",
- tp->module ?: "", tp->module ? ":" : "",
- tp->address);
+ strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
+ tp->module ? ":" : "", tp->address);
else
- ret = e_snprintf(buf + len, MAX_CMDLEN - len, "%s%s%s+%lu",
- tp->module ?: "", tp->module ? ":" : "",
- tp->symbol, tp->offset);
-
- if (ret <= 0)
- goto error;
- len += ret;
+ strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
+ tp->module ? ":" : "", tp->symbol, tp->offset);
- for (i = 0; i < tev->nargs; i++) {
- ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
- MAX_CMDLEN - len);
- if (ret <= 0)
+ for (i = 0; i < tev->nargs; i++)
+ if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
goto error;
- len += ret;
- }
- return buf;
+ ret = strbuf_detach(&buf, NULL);
error:
- free(buf);
- return NULL;
+ strbuf_release(&buf);
+ return ret;
}
static int find_perf_probe_point_from_map(struct probe_trace_point *tp,
static int convert_to_perf_probe_event(struct probe_trace_event *tev,
struct perf_probe_event *pev, bool is_kprobe)
{
- char buf[64] = "";
+ struct strbuf buf = STRBUF_INIT;
int i, ret;
/* Convert event/group name */
if (tev->args[i].name)
pev->args[i].name = strdup(tev->args[i].name);
else {
- ret = synthesize_probe_trace_arg(&tev->args[i],
- buf, 64);
- pev->args[i].name = strdup(buf);
+ strbuf_init(&buf, 32);
+ ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
+ pev->args[i].name = strbuf_detach(&buf, NULL);
}
if (pev->args[i].name == NULL && ret >= 0)
ret = -ENOMEM;
const char *module,
struct strbuf *result)
{
- int i, ret;
- char buf[128];
- char *place;
+ int i;
+ char *buf;
- /* Synthesize only event probe point */
- place = synthesize_perf_probe_point(&pev->point);
- if (!place)
- return -EINVAL;
+ if (asprintf(&buf, "%s:%s", group, event) < 0)
+ return -errno;
+ strbuf_addf(result, " %-20s (on ", buf);
+ free(buf);
- ret = e_snprintf(buf, 128, "%s:%s", group, event);
- if (ret < 0)
- goto out;
+ /* Synthesize only event probe point */
+ buf = synthesize_perf_probe_point(&pev->point);
+ if (!buf)
+ return -ENOMEM;
+ strbuf_addstr(result, buf);
+ free(buf);
- strbuf_addf(result, " %-20s (on %s", buf, place);
if (module)
strbuf_addf(result, " in %s", module);
if (pev->nargs > 0) {
strbuf_add(result, " with", 5);
for (i = 0; i < pev->nargs; i++) {
- ret = synthesize_perf_probe_arg(&pev->args[i],
- buf, 128);
- if (ret < 0)
- goto out;
+ buf = synthesize_perf_probe_arg(&pev->args[i]);
+ if (!buf)
+ return -ENOMEM;
strbuf_addf(result, " %s", buf);
+ free(buf);
}
}
strbuf_addch(result, ')');
-out:
- free(place);
- return ret;
+
+ return 0;
}
/* Show an event */
/* Events to command string */
char *synthesize_perf_probe_command(struct perf_probe_event *pev);
char *synthesize_probe_trace_command(struct probe_trace_event *tev);
-int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len);
+char *synthesize_perf_probe_arg(struct perf_probe_arg *pa);
/* Check the perf_probe_event needs debuginfo */
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
{
Dwarf_Die vr_die;
- char buf[32], *ptr;
+ char *buf, *ptr;
int ret = 0;
/* Copy raw parameters */
if (pf->pvar->name)
pf->tvar->name = strdup(pf->pvar->name);
else {
- ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
- if (ret < 0)
- return ret;
+ buf = synthesize_perf_probe_arg(pf->pvar);
+ if (!buf)
+ return -ENOMEM;
ptr = strchr(buf, ':'); /* Change type separator to _ */
if (ptr)
*ptr = '_';
- pf->tvar->name = strdup(buf);
+ pf->tvar->name = buf;
}
if (pf->tvar->name == NULL)
return -ENOMEM;
if (ret2 == 0) {
strlist__add(vl->vars,
strbuf_detach(&buf, NULL));
- }
- strbuf_release(&buf);
+ } else
+ strbuf_release(&buf);
}
}
--- /dev/null
+#ifndef __TRIGGER_H_
+#define __TRIGGER_H_ 1
+
+#include "util/debug.h"
+#include "asm/bug.h"
+
+/*
+ * Use trigger to model operations which need to be executed when
+ * an event (a signal, for example) is observed.
+ *
+ * States and transits:
+ *
+ *
+ * OFF--(on)--> READY --(hit)--> HIT
+ * ^ |
+ * | (ready)
+ * | |
+ * \_____________/
+ *
+ * is_hit and is_ready are two key functions to query the state of
+ * a trigger. is_hit means the event already happen; is_ready means the
+ * trigger is waiting for the event.
+ */
+
+struct trigger {
+ volatile enum {
+ TRIGGER_ERROR = -2,
+ TRIGGER_OFF = -1,
+ TRIGGER_READY = 0,
+ TRIGGER_HIT = 1,
+ } state;
+ const char *name;
+};
+
+#define TRIGGER_WARN_ONCE(t, exp) \
+ WARN_ONCE(t->state != exp, "trigger '%s' state transist error: %d in %s()\n", \
+ t->name, t->state, __func__)
+
+static inline bool trigger_is_available(struct trigger *t)
+{
+ return t->state >= 0;
+}
+
+static inline bool trigger_is_error(struct trigger *t)
+{
+ return t->state <= TRIGGER_ERROR;
+}
+
+static inline void trigger_on(struct trigger *t)
+{
+ TRIGGER_WARN_ONCE(t, TRIGGER_OFF);
+ t->state = TRIGGER_READY;
+}
+
+static inline void trigger_ready(struct trigger *t)
+{
+ if (!trigger_is_available(t))
+ return;
+ t->state = TRIGGER_READY;
+}
+
+static inline void trigger_hit(struct trigger *t)
+{
+ if (!trigger_is_available(t))
+ return;
+ TRIGGER_WARN_ONCE(t, TRIGGER_READY);
+ t->state = TRIGGER_HIT;
+}
+
+static inline void trigger_off(struct trigger *t)
+{
+ if (!trigger_is_available(t))
+ return;
+ t->state = TRIGGER_OFF;
+}
+
+static inline void trigger_error(struct trigger *t)
+{
+ t->state = TRIGGER_ERROR;
+}
+
+static inline bool trigger_is_ready(struct trigger *t)
+{
+ return t->state == TRIGGER_READY;
+}
+
+static inline bool trigger_is_hit(struct trigger *t)
+{
+ return t->state == TRIGGER_HIT;
+}
+
+#define DEFINE_TRIGGER(n) \
+struct trigger n = {.state = TRIGGER_OFF, .name = #n}
+#endif
projects / cascardo / linux.git / commitdiff