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

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Date:   Tue, 28 Mar 2023 01:28:01 +0000
From:   "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Uladzislau Rezki <urezki@...il.com>
CC:     "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

> From: Steven Rostedt <rostedt@...dmis.org>
> Sent: Tuesday, March 28, 2023 5:51 AM
> [...]
> 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 ;-)

Thank you Steven for sharing the libtracecmd-based and libtraceevent-based 
methods for trace parsing. Good to know this. This should simplify the code 
to parse trace logs. Pretty useful for me/us ;-)

- Qiuxu

> 
> -- Steve