From nobody Thu May 7 13:10:01 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3399C433EF for ; Sat, 28 May 2022 14:43:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236701AbiE1Onh (ORCPT ); Sat, 28 May 2022 10:43:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231317AbiE1Ong (ORCPT ); Sat, 28 May 2022 10:43:36 -0400 Received: from m12-17.163.com (m12-17.163.com [220.181.12.17]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5A14D140C1 for ; Sat, 28 May 2022 07:43:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=cm0sC 7DsxYFcYZwdu+XcBc/NM+JngXDXLDnGMoBREK4=; b=IgatDGFseGjnVsgukh6eE XaBKRLezndgSJ80VxVrGFopHbu5FmaqMn5In7sA2fXBxbgPJOBAYwsOw1oP2UG3j CAqQMztQ0FS7KA2f+yq69TjR5oeYp1XnOBFW2sYZd/1hSDx1hnBRD9xlk/Cp9+i7 HLgCkgtQK7cQ+HfesOnfQE= Received: from localhost (unknown [113.89.245.6]) by smtp13 (Coremail) with SMTP id EcCowABHtlLaNJJiy3DFEw--.201S2; Sat, 28 May 2022 22:42:36 +0800 (CST) From: Junwen Wu To: rostedt@goodmis.org, mingo@redhat.com, dave@stgolabs.net, will@kernel.org, peterz@infradead.org, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, Junwen Wu Subject: [PATCH v2] softirq: Add tracepoint for tasklet_entry/exit Date: Sat, 28 May 2022 14:42:28 +0000 Message-Id: <20220528144228.46867-1-wudaemon@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: EcCowABHtlLaNJJiy3DFEw--.201S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Zw4kJr1xWr15Gw43Ww4DJwb_yoW8tFW3pa sF9ayYkrWrJr42vr13A3WUZr15Zws3GFy7Jrs7GF13Zw1Uur1kta9rtF1jyFW0yr409Fy2 9a12qry3Cw1kua7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pMmhF-UUUUU= X-Originating-IP: [113.89.245.6] X-CM-SenderInfo: 5zxgtvxprqqiywtou0bp/xtbBxxgPbWB0Hw3xQQAAsL Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Usually softirq handler is pre-defined,only tasklet can be register by driver.We expand tracepoint for tasklet_entry/exit to trace tasklet handler. Signed-off-by: Junwen Wu --- Changes since v1: https://lore.kernel.org/all/20220508160624.48643-1-wudaem= on@163.com/ - Used DECLARE_EVENT_CLASS (Steven Rostedt) include/trace/events/irq.h | 41 ++++++++++++++++++++++++++++++++++++++ kernel/softirq.c | 4 ++++ 2 files changed, 45 insertions(+) diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h index eeceafaaea4c..62b7e53121da 100644 --- a/include/trace/events/irq.h +++ b/include/trace/events/irq.h @@ -160,6 +160,47 @@ DEFINE_EVENT(softirq, softirq_raise, TP_ARGS(vec_nr) ); =20 +DECLARE_EVENT_CLASS(tasklet, + + TP_PROTO(void *func), + + TP_ARGS(func), + + TP_STRUCT__entry( + __field( void*, func ) + ), + + TP_fast_assign( + __entry->func =3D func; + ), + + TP_printk("function=3D%ps", __entry->func) +); + +/** + * tasklet_entry - called immediately when a tasklet exec + * @func: the callback function when a tasklet exec + * + * When used in combination with the tasklet_entry tracepoint + * we can determine the callback function when a tasklet exec. + */ +DEFINE_EVENT(tasklet, tasklet_entry, + + TP_PROTO(void *func), + + TP_ARGS(func) +); + +/** + * tasklet_exit - called immediately after the tasklet handler returns + * @func: the callback function when a tasklet exec + */ +DEFINE_EVENT(tasklet, tasklet_exit, + + TP_PROTO(void *func), + + TP_ARGS(func) +); #endif /* _TRACE_IRQ_H */ =20 /* This part must be outside protection */ diff --git a/kernel/softirq.c b/kernel/softirq.c index 41f470929e99..79b3814ad166 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -780,10 +780,14 @@ static void tasklet_action_common(struct softirq_acti= on *a, if (tasklet_trylock(t)) { if (!atomic_read(&t->count)) { if (tasklet_clear_sched(t)) { + trace_tasklet_entry(t->use_callback ? (void *)t->callback + : (void *)t->func); if (t->use_callback) t->callback(t); else t->func(t->data); + trace_tasklet_exit(t->use_callback ? (void *)t->callback + : (void *)t->func); } tasklet_unlock(t); continue; --=20 2.25.1