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From: Steven Rostedt <rostedt@goodmis.org>
To: Joel Fernandes <joel@joelfernandes.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Joel Fernandes <joelaf@google.com>,
	linux-kernel@vger.kernel.org,
	Peter Zilstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Boqun Feng <boqun.feng@gmail.com>,
	byungchul.park@lge.com, kernel-team@android.com,
	Josh Triplett <josh@joshtriplett.org>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Re: [PATCH 1/4] rcu: Speed up calling of RCU tasks callbacks
Date: Wed, 23 May 2018 21:35:53 -0400	[thread overview]
Message-ID: <20180523213553.7a0ffd6d@gandalf.local.home> (raw)
In-Reply-To: <20180524005119.GA170821@joelaf.mtv.corp.google.com>

On Wed, 23 May 2018 17:51:19 -0700
Joel Fernandes <joel@joelfernandes.org> wrote:

> Shouldn't this assignment be done outside the loop? I believe the variable
> will be initialized on each iteration.
> 
> A program like this doesn't terminate:
> 
> #include<stdio.h>
> 
> int main() {
> 	for (;;) {
> 		int i = 10;
> 		if (!(i--))
> 			break;
> 	}
> 
> 	return 0;
> }

Hey, it compiled, booted and tested. SHIP IT! ;-)

But yeah, a little egg on my face for that one. I blame it for the
first code I wrote right off of coming back from vacation.

> 
> Otherwise looks good to me, I would initialize fract to 10 so its consistent
> with "HZ/10" in other parts of the code but I'm ok with either number.

I was thinking about that, but for some reason I thought 15. Not sure
why. I'm fine with dropping it down to 10. I'll send out a more proper
patch tomorrow.

Thanks!

-- Steve

  reply	other threads:[~2018-05-24  1:36 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-23  6:38 [PATCH 0/4] cleanups, fixes for rcu/dev Joel Fernandes
2018-05-23  6:38 ` [PATCH 1/4] rcu: Speed up calling of RCU tasks callbacks Joel Fernandes
2018-05-23 15:57   ` Paul E. McKenney
2018-05-23 16:45     ` Steven Rostedt
2018-05-23 17:03       ` Paul E. McKenney
2018-05-23 19:13         ` Steven Rostedt
2018-05-23 20:04           ` Paul E. McKenney
2018-05-23 21:51             ` Joel Fernandes
2018-05-24  0:51             ` Joel Fernandes
2018-05-24  1:35               ` Steven Rostedt [this message]
2018-05-24 21:47             ` Steven Rostedt
2018-05-24 22:38               ` Paul E. McKenney
2018-05-24 22:42                 ` Steven Rostedt
2018-07-17  9:11                 ` [tip:core/rcu] rcu: Add comment to the last sleep in the rcu tasks loop tip-bot for Steven Rostedt (VMware)
2018-07-17  9:11   ` [tip:core/rcu] rcu: Speed up calling of RCU tasks callbacks tip-bot for Steven Rostedt (VMware)
2018-05-23  6:38 ` [PATCH 2/4] rcu: Add comment documenting how rcu_seq_snap works Joel Fernandes
2018-05-23 16:04   ` Paul E. McKenney
2018-05-23  6:38 ` [PATCH 3/4] rcu: Use better variable names in funnel locking loop Joel Fernandes
2018-05-23 16:06   ` Paul E. McKenney
2018-05-23 19:23     ` Paul E. McKenney
2018-05-24  0:54       ` Joel Fernandes
2018-05-24  1:27         ` Paul E. McKenney
2018-05-23  6:38 ` [PATCH 4/4] rcu: Identify grace period is in progress as we advance up the tree Joel Fernandes
2018-05-23 16:06   ` Paul E. McKenney

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