Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 27 Mar 2023 17:50:59 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Uladzislau Rezki <urezki@gmail.com>
Cc:     "Zhuo, Qiuxu" <qiuxu.zhuo@intel.com>,
        "Paul E . McKenney" <paulmck@kernel.org>,
        RCU <rcu@vger.kernel.org>,
        "quic_neeraju@quicinc.com" <quic_neeraju@quicinc.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@sony.com>,
        Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH 1/1] Reduce synchronize_rcu() waiting time
Message-ID: <20230327175059.1e8584cc@gandalf.local.home>
In-Reply-To: <20230327174844.15305988@gandalf.local.home>
References: <20230321102748.127923-1-urezki@gmail.com>
        <IA1PR11MB617169A10E6DDE3C1168605D89819@IA1PR11MB6171.namprd11.prod.outlook.com>
        <ZBnKKZsSpI8aAk9W@pc636>
        <20230327174844.15305988@gandalf.local.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Precedence: bulk

On Mon, 27 Mar 2023 17:48:44 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> struct my_info {
> 	/* store state info here */
> };
> 
> int main(...) {
> 	struct tracecmd_input *handle;
> 	struct my_info info;
> 	char *file = argv[1];
> 
> 	handle = tracecmd_open(file);
> 
> 	tracecmd_follow_event(handle, "rcu", "rcu_batch_start",
> 			batch_start, &info);
> 
> 	tracecmd_follow_event(handle, "rcu", "rcu_batch_end",
> 			batch_end, &info);
> 
> 	tracecmd_follow_event(handle, "rcu", "rcu_invoke_callback",
> 			invoke_callback, &info);
> 
> 	tracecmd_iterate_events(handle, NULL, 0, NULL, NULL);
> 
> 	tracecmd_close(handle);
> }

BTW, none of this code was actually tested, so I may have some syntax
errors. I just did this straight from memory, as it's so easy ;-)

-- Steve