linux-kernel - Re: [PATCH] local

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Message-ID: <20070109224100.GB6555@elf.ucw.cz>
Date:	Tue, 9 Jan 2007 23:41:00 +0100
From:	Pavel Machek <pavel@....cz>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Christoph Hellwig <hch@...radead.org>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com,
	Douglas Niehaus <niehaus@...s.ku.edu>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] local_t : Documentation

Hi!

> > > These patches extend and standardise local_t operations on each architectures,
> > > allowing a rich set of atomic operations to be done on per-cpu data with
> > > minimal performance impact. On some architectures, there seems to be no
> > > difference between the SMP and UP operation (same memory barriers, same
> > > LOCking), local.h simply includes asm-generic/local.h, which removes duplicated
> > > code.
> > 
> > Could you provide some Documentation/? Knowing when local_t can be
> > used is kind-of important.
> 
> Hi Pavel,
> 
> Thanks for this appropriate comment. I totally agree that there is a need for
> documentation about how local_t variables should be used. Here is the patch
> that adds Documentation/local_ops.txt. Comments are welcome.

AFAICT this fails to mention... Is local_t as big as int? As big as
long? Or perhaps smaller because high bits may be needed for locking?

									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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