tree db010a5d70682c2d0e8b479a6c6672fb944a3ee0
parent 47b7e7c3a4c8734fc836999089898194ca45b1b6
author Ian Kent <raven@themaw.net> 1617965933 +0800
committer Ian Kent <raven@themaw.net> 1617965933 +0800

kernfs: use VFS negative dentry caching

If there are many lookups for non-existent paths these negative lookups
can lead to a lot of overhead during path walks.

The VFS allows dentries to be created as negative and hashed, and caches
them so they can be used to reduce the fairly high overhead alloc/free
cycle that occurs during these lookups.

Signed-off-by: Ian Kent <raven@themaw.net>