Re: [PATCH 1/3] sysfs directory scaling: rbtree for dirent namelookups

From: Greg KH
Date: Mon Nov 02 2009 - 22:58:40 EST

On Sun, Nov 01, 2009 at 11:31:30AM -0500, Benjamin LaHaise wrote:
> Use an rbtree in sysfs_dirent to speed up file lookup times
> Systems with large numbers (tens of thousands and more) of network
> interfaces stress the sysfs code in ways that make the linear search for
> a name match take far too long. Avoid this by using an rbtree.

What kind of speedups are you seeing here? And do these changes cause a
memory increase due to the structure changes which outweigh the

What kind of test are you doing to reproduce this?


greg k-h
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