Re: [RFC v4 Patch 0/4] fs/inode.c: optimization for inode lockusage

[Matthew Wilcox]

On Fri, Sep 21, 2012 at 05:31:02PM +0800, Guo Chao wrote:
> This patchset optimizes several places which take the per inode spin lock.
> They have not been fully tested yet, thus they are marked as RFC. 
> 
> I do limited tests after all patches applied: use two 'find' to traverse the 
> filesystems and touch all files in parallel. This runs for several days in a 
> virtual machine, no suspicious log appears. 

Have you done any performance testing?  Taking and releasing a lock which
isn't contended is not particularly expensive.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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