Re: [PATCH 23/32] Generic dynamic per cpu refcounting

[Tejun Heo]

Hello, again.

On Thu, Jan 24, 2013 at 06:03:40PM -0800, Tejun Heo wrote:
> Yeah, if we're aiming to replace refcnts in file and kobj, dynamic
> alloc may be justified.  Hopefully, the accounting necessary to decide
> whethre to use percpu isn't too burdensome.

Ooh, I forgot one thing.  We might not gain much by replacing file
refcnt w/ this.  You can't really get cheaper than fget_light().
Also, while kobj destruction can still be considered an infrequent
operation, file destruction is not and people will get mighty unhappy
if you do synchronize_sched/rcu() from fput() synchronously.

So, I'm now back to "do we need dynamic allocation".  What else do we
have to convert?

Thanks.

-- 
tejun
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