[PATCH 0/4] De-couple sysfs memory directories from memory sections

Greg KH greg at kroah.com
Fri Jan 21 04:25:26 EST 2011

On Thu, Jan 20, 2011 at 10:51:44AM -0600, Nathan Fontenot wrote:
> On 01/20/2011 10:45 AM, Greg KH wrote:
> > On Thu, Jan 20, 2011 at 10:36:40AM -0600, Nathan Fontenot wrote:
> >> The root of this issue is in sysfs directory creation. Every time
> >> a directory is created a string compare is done against sibling
> >> directories ( see sysfs_find_dirent() ) to ensure we do not create 
> >> duplicates.  The list of directory nodes in sysfs is kept as an
> >> unsorted list which results in this being an exponentially longer
> >> operation as the number of directories are created.
> > 
> > Again, are you sure about this?  I thought we resolved this issue in the
> > past, but you were going to check it.  Did you?
> > 
> Yes, the string compare is still present in the sysfs code.  There was
> discussion around this sometime last year when I sent a patch out that
> stored the directory entries in something other than a linked list.
> That patch was rejected but it was agreed that something should be done.

Ah, ok, thanks for verifying.

greg k-h

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