Re: [PATCH 1/3] sysfs directory scaling: rbtree for dirent name lookups
From: Eric W. Biederman
Date: Tue Nov 03 2009 - 05:41:48 EST
Benjamin LaHaise <bcrl@xxxxxxxx> writes:
> 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.
Please take a look at the cleanups_scaling branch at:
I haven't spent a lot of time on it but it is possible to get everything
except the rbtree without increasing the size of sysfs_dirent. Also we
don't need the both the rbtree and a linked list.
In particular see:
Author: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Sat Oct 31 04:11:18 2009 -0700
sysfs: Sort sysfs directories by name hash.
This is a step in preparation for introducing a more efficient
data structure than a linked list for sysfs entries. By ordering
by name hash instead of by inode sysfs_lookup can be speeded
up as well as allowing restarting after seekdir.
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx>
Meanwhile back to pushing the most important ones for real.
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