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Date: Mon, 26 Oct 2020 01:50:58 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc: linux-kernel@...r.kernel.org,
Josh Triplett <josh@...htriplett.org>,
Lai Jiangshan <jiangshanlai@...il.com>,
Marco Elver <elver@...gle.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
"Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
Steven Rostedt <rostedt@...dmis.org>,
"Uladzislau Rezki (Sony)" <urezki@...il.com>, fweisbec@...il.com,
neeraj.iitr10@...il.com
Subject: Re: [PATCH v8 2/6] rcu/segcblist: Add counters to segcblist
datastructure
On Wed, Oct 21, 2020 at 03:08:09PM -0400, Joel Fernandes (Google) wrote:
> bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq)
> {
> - int i;
> + int i, j;
>
> WARN_ON_ONCE(!rcu_segcblist_is_enabled(rsclp));
> if (rcu_segcblist_restempty(rsclp, RCU_DONE_TAIL))
> @@ -487,6 +508,10 @@ bool rcu_segcblist_accelerate(struct rcu_segcblist *rsclp, unsigned long seq)
> if (rcu_segcblist_restempty(rsclp, i) || ++i >= RCU_NEXT_TAIL)
> return false;
>
> + /* Accounting: everything below i is about to get merged into i. */
> + for (j = i + 1; j <= RCU_NEXT_TAIL; j++)
> + rcu_segcblist_move_seglen(rsclp, j, i);
> +
Can you perhaps reuse the below loop to move the seglen?
Thanks.
> /*
> * Merge all later callbacks, including newly arrived callbacks,
> * into the segment located by the for-loop above. Assign "seq"
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