linux-kernel - Re: [PATCH 1/1] Reduce synchronize

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Message-ID: <20230327175059.1e8584cc@gandalf.local.home>
Date:   Mon, 27 Mar 2023 17:50:59 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        RCU <rcu@...r.kernel.org>,
        "quic_neeraju@...cinc.com" <quic_neeraju@...cinc.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: Re: [PATCH 1/1] Reduce synchronize_rcu() waiting time

On Mon, 27 Mar 2023 17:48:44 -0400
Steven Rostedt <rostedt@...dmis.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