kernel spinlocks; when to use; when appropriate?

kernel spinlocks; when to use; when appropriate?

[Lars Unin]

Hi,
   When is is appropriate to use spinlocks in the kernel,
how are they implemented (e.g. syntax, function names) and
can anyone think of a good area of the kernel for me to look 
at, that uses them?

Thanks again for any help.
                   Lars.

Thanks double-ly if you give code examples... :-)
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Re: kernel spinlocks; when to use; when appropriate?

[Jonathan Corbet]

>    When is is appropriate to use spinlocks in the kernel,
> how are they implemented (e.g. syntax, function names) and
> can anyone think of a good area of the kernel for me to look 
> at, that uses them?

May I humbly suggest a look at Linux Device Drivers, Second Edition?  It
goes over locking primitives in a fair amount of detail, and includes
examples of their use.  Available freely online at:

	http://www.xml.com/ldd/chapter/book/index.html

or in your favorite bookstore.

jon

Jonathan Corbet
Executive editor, LWN.net
corbet@lwn.net

LKML FAQ updating (was: Re: kernel spinlocks; when to use; when appropriate?)

[Rob Landley]

Okay, that link needs to go in the "basic linux kernel documentation" section 
at the start of the "http://www.tux.org/lkml/" faq, along with some other 
resources that have fallen through the cracks.  I'd happily generate a patch 
against the FAQ, but haven't a clue what the source format is.  (Is it 
hand-hacked HTML?)

Documentation resources:

Linux Device Drivers, second edition (whole book online).
http://www.xml.com/ldd/chapter/book/index.html

Porting device drivers to 2.5 (30-article series):
http://lwn.net/Articles/driver-porting/

Linux Kernel Internals (walkthrough of kernel 2.4 source):
http://www.moses.uklinux.net/patches/lki.html

Mel Gorman's Virtual Memory Guides (read "understanding" first, then 
"coding"):
http://www.csn.ul.ie/~mel/projects/vm/guide/

Also, the "asking smart questions" thing isn't on tuxedo.org anymore, it's on 
catb.org.  (Otherwise same URL.)

And while we're on the subject, could the mention of the Documentation 
directory in the linux kernel source A) be moved to the start of the list, B) 
be updated to include a mention of "make htmldocs" and friends?

I'm sure there's more, this is just off the top of my head.  I'd be happy to 
whip up a patch if I had a clue what file it should be against...

Rob

On Monday 09 June 2003 11:50, Jonathan Corbet wrote:
> >    When is is appropriate to use spinlocks in the kernel,
> > how are they implemented (e.g. syntax, function names) and
> > can anyone think of a good area of the kernel for me to look
> > at, that uses them?
>
> May I humbly suggest a look at Linux Device Drivers, Second Edition?  It
> goes over locking primitives in a fair amount of detail, and includes
> examples of their use.  Available freely online at:
>
> 	http://www.xml.com/ldd/chapter/book/index.html
>
> or in your favorite bookstore.
>
> jon
>
> Jonathan Corbet
> Executive editor, LWN.net
> corbet@lwn.net
> -
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