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Message-ID: <20160426135433.GB11033@kernel.org>
Date: Tue, 26 Apr 2016 10:54:33 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Wang Nan <wangnan0@...wei.com>
Cc: jolsa@...hat.com, namhyung@...nel.org,
linux-kernel@...r.kernel.org, pi3orama@....com,
Adrian Hunter <adrian.hunter@...el.com>,
He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Zefan Li <lizefan@...wei.com>
Subject: Re: [PATCH v6 2/7] perf tools: Derive trigger class from
auxtrace_snapshot
Em Wed, Apr 20, 2016 at 06:59:49PM +0000, Wang Nan escreveu:
> auxtrace_snapshot_state matches trigger model. Use trigger to implement
> it. auxtrace_snapshot_state and auxtrace_snapshot_err are absorbed.
Adrian, this is changing code you wrote, can you please take a look? An
Acked-by would be excellent,
Best Regards,
- Arnaldo
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: He Kuang <hekuang@...wei.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: pi3orama@....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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