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

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Message-ID: <20130611002258.GY5146@linux.vnet.ibm.com>
Date:	Mon, 10 Jun 2013 17:22:59 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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 Mon, Jun 10, 2013 at 07:02:56PM -0400, Steven Rostedt wrote:
> 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?

"arch_spinlock pointer", but yes.  Or I suppose a millenia-late warning
to Cleopatra.

>                                            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.

Fair enough!

							Thanx, Paul

> -- 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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