Re: [rfc][patch] dynamic resizing dentry hash using RCU

[Zach Brown]

On Feb 23, 2007, at 7:37 AM, Nick Piggin wrote:

> The dentry hash uses up 8MB for 1 million entries on my 4GB system  
> is one
> of the biggest wasters of memory for me. Because I rarely have more  
> than one or
> two hundred thousand dentries. And that's with several kernel trees  
> worth of
> entries. Most desktop and probably even many types of servers will  
> only use a
> fraction of that.
>
> So I introduce a new method for resizing hash tables with RCU, and  
> apply
> that to the dentry hash.

Can you compare what you've done to the design that Paul and David  
talked about a year ago?

  http://lkml.org/lkml/2006/1/30/74

I'd love to see a generic implementation of RCU hashing that  
subsystems can then take advantage of.  It's long been on the fun  
side of my todo list.  The side I never get to :/.

- z

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