From nobody Fri May 15 08:28:14 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 22CD1C433EF for ; Sun, 8 May 2022 16:08:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235226AbiEHQM2 (ORCPT ); Sun, 8 May 2022 12:12:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34782 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235083AbiEHQMW (ORCPT ); Sun, 8 May 2022 12:12:22 -0400 Received: from m12-11.163.com (m12-11.163.com [220.181.12.11]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B0B7A264D for ; Sun, 8 May 2022 09:08:31 -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=9xhe1 TpWpUHgTAUGhKM8bXnmGiRbvfK7a5SuRwyL/l0=; b=kE+CE//EPbRPkrujhHKJl ObOczwB2hAkBbOnxTyzvFlORQYbPjwvHqH/LPNynuU09OGSqWnjcUteoPmlDotMv ezdNABB2g1pOEHjbXM0Rm9avF6Tk5TipJjAsa+MatbEzGb9Rc46mz75QAFF7piaS JtePeVGHrHILARgNNX8AbA= Received: from localhost (unknown [113.89.246.196]) by smtp7 (Coremail) with SMTP id C8CowAA3GrCI6ndiKd0cBg--.17208S2; Mon, 09 May 2022 00:06:33 +0800 (CST) From: Junwen Wu To: rostedt@goodmis.org, mingo@redhat.com, tglx@linutronix.de, frederic@kernel.org, tannerlove@google.com, wudaemon@163.com Cc: linux-kernel@vger.kernel.org Subject: [PATCH v1] softirq: Add tracepoint for tasklet_entry/exit Date: Sun, 8 May 2022 16:06:24 +0000 Message-Id: <20220508160624.48643-1-wudaemon@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: C8CowAA3GrCI6ndiKd0cBg--.17208S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7Zw4kJr1xXFyxJw43Gw17Wrg_yoW8AFy3pa 4qkFya9rWrJr429r4fA3WUAF15Zwn3CF9rGrs7G3W3Ar4xXr1ktwsFqF1qyayktr409r9F 9FnIqrW3Cw1kua7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0zM5l19UUUUU= X-Originating-IP: [113.89.246.196] X-CM-SenderInfo: 5zxgtvxprqqiywtou0bp/xtbBxwn6bWB0HLyHFwAAs9 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 --- include/trace/events/irq.h | 32 ++++++++++++++++++++++++++++++++ kernel/softirq.c | 4 ++++ 2 files changed, 36 insertions(+) diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h index eeceafaaea4c..d3e922dcd475 100644 --- a/include/trace/events/irq.h +++ b/include/trace/events/irq.h @@ -160,6 +160,38 @@ DEFINE_EVENT(softirq, softirq_raise, TP_ARGS(vec_nr) ); =20 +TRACE_EVENT(tasklet_entry, + + 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) +); +TRACE_EVENT(tasklet_exit, + + 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) +); #endif /* _TRACE_IRQ_H */ =20 /* This part must be outside protection */ diff --git a/kernel/softirq.c b/kernel/softirq.c index 41f470929e99..b3bce2b3b655 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=20 + : (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