Re: [PATCH] Document futex PI design

[Steven Rostedt <rostedt@goodmis.org>]

On Wed, 10 May 2006, Gleb Natapov wrote:

> On Wed, May 10, 2006 at 06:59:49AM -0400, Steven Rostedt wrote:
> > +lock	 - In this document from now on, the term lock and spin lock will
> > +	   be synonymous.  These are locks that are used for SMP as well
> > +	   as turning off preemption to protect areas of code on SMP machines.
> Should the last SMP be UP?
>

Grmb, I should fix that definition.

No, it should still be SMP but the definition is awkward.  I need to state
that really, when I refer to "lock" I mean that I'm talking about raw spin
locks.  So it mainly protects SMP code, but also UP by disabling
preemption.  So I'm talking about a normal spin_lock.

I wrote this document generically so that it works for both the vanilla
kernel when talking about the PI of futexes, as well as when talking about
the -rt patch with its kernel mutexes.  In the -rt patch, spin locks turn
into mutexes, so I was stumbling over not mentioning spin_locks per se,
but was trying to explain them as just spinning locks.

Anyway, I should rewrite that definition.

Thanks for the feedback,

-- Steve

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