From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752386AbcEAHjT (ORCPT ); Sun, 1 May 2016 03:39:19 -0400 Received: from terminus.zytor.com ([198.137.202.10]:40272 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751003AbcEAHjR (ORCPT ); Sun, 1 May 2016 03:39:17 -0400 Date: Sun, 1 May 2016 00:39:02 -0700 From: tip-bot for Wang Nan Message-ID: Cc: tglx@linutronix.de, lizefan@huawei.com, mingo@kernel.org, jolsa@redhat.com, mhiramat@kernel.org, acme@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, adrian.hunter@intel.com, wangnan0@huawei.com, hekuang@huawei.com, namhyung@kernel.org Reply-To: namhyung@kernel.org, hekuang@huawei.com, wangnan0@huawei.com, linux-kernel@vger.kernel.org, adrian.hunter@intel.com, hpa@zytor.com, acme@redhat.com, mhiramat@kernel.org, jolsa@redhat.com, mingo@kernel.org, lizefan@huawei.com, tglx@linutronix.de In-Reply-To: <1461178794-40467-2-git-send-email-wangnan0@huawei.com> References: <1461178794-40467-2-git-send-email-wangnan0@huawei.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf tools: Introduce trigger class Git-Commit-ID: 3dcc4436fa6f09ce093ff59bf8477c3059dc46df X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 3dcc4436fa6f09ce093ff59bf8477c3059dc46df Gitweb: http://git.kernel.org/tip/3dcc4436fa6f09ce093ff59bf8477c3059dc46df Author: Wang Nan AuthorDate: Wed, 20 Apr 2016 18:59:48 +0000 Committer: Arnaldo Carvalho de Melo CommitDate: Thu, 28 Apr 2016 09:58:58 -0300 perf tools: Introduce trigger class 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. Signed-off-by: Wang Nan Acked-by: Adrian Hunter Cc: He Kuang Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1461178794-40467-2-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/trigger.h | 94 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) diff --git a/tools/perf/util/trigger.h b/tools/perf/util/trigger.h new file mode 100644 index 0000000..e97d701 --- /dev/null +++ b/tools/perf/util/trigger.h @@ -0,0 +1,94 @@ +#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