linux-kernel - Re: [PATCH RFC ticketlock] Auto-queued ticketlock

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Message-ID: <1370905376.9844.137.camel@gandalf.local.home>
Date:	Mon, 10 Jun 2013 19:02:56 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, sbw@....edu,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH RFC ticketlock] Auto-queued ticketlock

On Sun, 2013-06-09 at 12:36 -0700, Paul E. McKenney wrote:

> +/*
> + * Return a pointer to the queue header associated with the specified lock,
> + * or return NULL if there is no queue for the lock or if the lock's queue
> + * is in transition.
> + */
> +static struct tkt_q_head *tkt_q_find_head(arch_spinlock_t *asp)

BTW, what does "asp" mean? arch_spinlock?  If so, can we just call it
"lock" and be consistent with all the other spinlock calls in the
kernel. Because, I keep thinking this has something to do with Microsoft
dynamic web pages.

-- Steve

> +{
> +	int i;
> +	int start;
> +
> +	start = i = tkt_q_hash(asp);
> +	do
> +		if (tkt_q_heads[i].ref == asp)
> +			return &tkt_q_heads[i];
> +	while ((i = tkt_q_next_slot(i)) != start);
> +	return NULL;
> +}
> +


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