Messages in this thread | | | Date | Wed, 16 Apr 2008 09:50:26 -0700 | From | Arjan van de Ven <> | Subject | Re: [PATCH] Replace completions with semaphores |
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On Wed, 16 Apr 2008 18:31:08 +0200 Oliver Neukum <oliver@neukum.org> wrote:
> Am Mittwoch, 16. April 2008 18:16:52 schrieb Matthew Wilcox: > > The basic idea is that you get back a cookie from the > > kcounter_claim() which you have to hand to the kcounter_release() > > function so it knows which one you released. It's similar to mutex > > debugging except > > So in addition to the kcounter we need to save a token in a data > structure? In fact, there must be a data structure that can house > that token. So you can no longer live with a pointer just to a device > descriptor, but every individual use of a resource must have an > associated data structure?
yup. For kcounters there is a clear owner for each "slot". [This is the part that makes it debugable again)
Now for non-debug builds, the space taken for the token can be.. zero depending on how we define the types for it.
> > Regards > Oliver > > -- > To unsubscribe from this list: send the line "unsubscribe > linux-kernel" in the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- If you want to reach me at my work email, use arjan@linux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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