status performance and ... chdir

[Paul LeoNerd Evans]

On Wed, 10 Sep 2008 15:52:11 +1000
Robert Collins <robertc at robertcollins.net> wrote:

> The nice thing about experiments is you can be staggered by the result.
> 
> Executive summary: we should chdir. Lots.

Or maybe even open() and fchdir(). It doesn't help the first time, but it
helps when you come "back" again; it avoids another directory name =>
inode lookup in the kernel. Keep a stack of opened directory fds, rather
than names.

Only real downside to this is it starts to eat up your fd limit - 1024
usually. Shouldn't be a major issue except for -really- deep trees. At
which point perhaps you can switch to names if you have a stack taller
than, say, 200 dirs?

-- 
Paul "LeoNerd" Evans

leonerd at leonerd.org.uk
ICQ# 4135350       |  Registered Linux# 179460
http://www.leonerd.org.uk/
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