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Subject[PATCH v6 2/7] perf tools: Derive trigger class from auxtrace_snapshot
Date
auxtrace_snapshot_state matches trigger model. Use trigger to implement
it. auxtrace_snapshot_state and auxtrace_snapshot_err are absorbed.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
tools/perf/builtin-record.c | 73 +++++++++++++--------------------------------
1 file changed, 20 insertions(+), 53 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index bd95933..f4710c8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -34,6 +34,7 @@
#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>
@@ -127,44 +128,8 @@ static volatile int done;
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 void sig_handler(int sig)
{
@@ -282,11 +247,12 @@ static void record__read_auxtrace_snapshot(struct record *rec)
{
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);
}
}

@@ -686,7 +652,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)

if (rec->opts.auxtrace_snapshot_mode) {
signal(SIGUSR2, snapshot_sig_handler);
- auxtrace_snapshot_on();
+ trigger_on(&auxtrace_snapshot_trigger);
} else {
signal(SIGUSR2, SIG_IGN);
}
@@ -815,21 +781,21 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
perf_evlist__enable(rec->evlist);
}

- auxtrace_snapshot_enable();
+ trigger_ready(&auxtrace_snapshot_trigger);
for (;;) {
unsigned long long hits = rec->samples;

if (record__mmap_read_all(rec) < 0) {
- auxtrace_snapshot_disable();
+ trigger_error(&auxtrace_snapshot_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;
@@ -858,12 +824,12 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
* 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);

if (forks && workload_exec_errno) {
char msg[STRERR_BUFSIZE];
@@ -1445,9 +1411,10 @@ out_symbol_exit:

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);
+ }
}
--
1.8.3.4
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