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SubjectRe: [PATCH, RFC, tip/core/rcu] scalable classic RCU implementation
On Mon, Aug 25, 2008 at 05:26:43PM +0200, Peter Zijlstra wrote:
> On Mon, 2008-08-25 at 08:16 -0700, Paul E. McKenney wrote:
> > On Mon, Aug 25, 2008 at 12:34:56PM +0200, Peter Zijlstra wrote:
> > > On Fri, 2008-08-22 at 16:29 -0700, Josh Triplett wrote:
> > >
> > > > > @@ -26,8 +27,10 @@
> > > > > * http://lse.sourceforge.net/locking/rclock_OLS.2001.05.01c.sc.pdf (OLS2001)
> > > > > *
> > > > > * For detailed explanation of Read-Copy Update mechanism see -
> > > > > - * Documentation/RCU
> > > > > - *
> > > > > + * Documentation/RCU
> > > > > + * http://lwn.net/Articles/262464/ (What is RCU, Fundamentally?)
> > > > > + * http://lwn.net/Articles/263130/ (What is RCU's Usage?)
> > > > > + * http://lwn.net/Articles/264090/ (What is RCU's API? + references)
> > > > > */
> > > >
> > > > Why put these references here rather than in Documentation/RCU? It
> > > > seems easier to keep documentation up to date in one place. If you
> > > > think these represent a good "getting started" set of documents, how
> > > > about a Documentation/RCU/ReadTheseFirst with links to them, or how
> > > > about linking to them from whatisRCU.txt?
> > >
> > > I actually like in code comments and 'documentation' more than
> > > Documentation/ stuff. Mostly because Documentation/ is:
> > > - far away from the code
> > > - therefore, more easily bitrotted
> > > - and easily forgotten
> >
> > I know!!!
> >
> > #ifdef JOSH_TRIPLETT
> > * Documentation/RCU
> > * http://lwn.net/Articles/262464/ (What is RCU, Fundamentally?)
> > * http://lwn.net/Articles/263130/ (What is RCU's Usage?)
> > * http://lwn.net/Articles/264090/ (What is RCU's API? + references)
> > #elif PETER_ZIJLSTRA
> > * Documentation/RCU
> > #endif
> >
> > (Sorry, couldn't resist!!!)
>
> But but but, you got the cases the wrong way around.. ;-)

Good point...

#ifdef READER_LIKES_DOCUMENTATION_URLS_IN_COMMENTS
* Documentation/RCU
* http://lwn.net/Articles/262464/ (What is RCU, Fundamentally?)
* http://lwn.net/Articles/263130/ (What is RCU's Usage?)
* http://lwn.net/Articles/264090/ (What is RCU's API? + references)
#else
* Documentation/RCU
#endif

Of course, the C preprocessor would just remove the whole comment
anyway, but hopefully it is the thought that counts. ;-)

> > Seriously, I know where all the documentation is, as I wrote most of it.
> > These comments are for you guys. So, any thoughts on how I should
> > resolve this? My default is, as always, a coin flip. ;-)
>
> I guess we could do the 'this is how the concept works and can be used
> like so and so' documentation in Documentation/

Documentation/RCU/whatisRCU.txt does in fact contain the three URLs
listed above. And there is always Documentation/RCU/RTFP.txt for
people wanting the full effect.

> And the stuff that says 'this code does like so and so, because blah'
> should stay near the code.
>
> And in any case of doubt - stay near the code :-)
>
> I always view Documentation/ as end user stuff (be that a kernel
> programmer that needs to learn a new API, or userland folks or people
> wanting to know what a certain feature is about).

I confess to erring on the side of spamming all channels. Then again,
I am a serial junk-mailer, so perhaps this is just me.

Thanx, Paul


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