Re: [patch] Add kref_read and kref_put_last primitives

[Ravikiran G Thirumalai]

On Mon, Jul 26, 2004 at 05:31:51PM +0100, Christoph Hellwig wrote:
> On Mon, Jul 26, 2004 at 08:18:56PM +0530, Ravikiran G Thirumalai wrote:
> > ...
> 
> Why don't you simply use an atomic_t if that's what you seem to
> want?
> 

struct kref does just that.  The kref api are just abstractions for 
refcounting which i presume is recommended for all refcounters in the
kernel.  I am just converting the struct file.f_count refcounter
to use kref with this patch.  

My actual intentions are to extend the kref api to do lock free refcounting 
and use that for the file.f_count refcounter, and make fd lookup lock 
free using rcu.  My earlier experiments with such patches showed 
performance improvements for threaded workloads which do lot of io.

Thanks,
Kiran
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