Re: [Lse-tech] Re: [RFC] dcache scalability patch (2.4.17)

[Hanna Linder <hannal@us.ibm.com>]

--On Friday, July 12, 2002 10:29:53 -0400 Alexander Viro <viro@math.psu.edu> wrote:
> 
> 
> On Fri, 12 Jul 2002, Maneesh Soni wrote:
> 
>> Here is the dcache scalability patch (cleaned up) as disscussed in 
>> the previous post to lkml by Dipankar. The patch uses RCU for doing fast
>> dcache lookup. It also does lazy updates to lru list of dentries to
>> avoid doing write operations while doing lookup.
> 
> Where is
> 	* version for 2.5.<current>
> 	* analysis of benefits in real-world situations for 2.5 version?
> 
> Patch adds complexity and unless you can show that it gives significant
> benefits outside of pathological situations, it's not going in.


Here are the slides where I presented, among other things, some 
performance results of fastwalk compared to using rcu with lazy 
updating of the d_lru list. The results are similar to what Dipankar 
just published but there are a few more data points.

http://lse.sf.net/locking

Thanks.

Hanna