Module Name: src
Committed By: ad
Date: Tue Jan 14 11:07:40 UTC 2020
Modified Files:
src/sys/kern [ad-namecache]: vfs_cache.c
src/sys/sys [ad-namecache]: namei.src vnode_impl.h
Log Message:
namecache:
This is working better than expected. It seems to cut system time for
build.sh by ~10% on my test machine and joerg@ is seeing better results with
pbulk. Improve it a bit more without changing the basic idea:
- Split cache_list_lock into a per-vnode rwlock for reverse lookup, and a
lightly contended global lock on LRU state (cache_lru_lock),
- For LRU replacement, imitate the VM system's page replacement algorithm.
This eliminates the writebacks to struct namecache (to track time of last
hit).
- Dynamically allocate the per-directory lock, preparing the way for having
a "struct nchdir" or similar which could contain stuff like different
structures for lookup, cached info to do the equivalent of VOP_ACCESS() in
cache, and so on.
To generate a diff of this commit:
cvs rdiff -u -r1.126.2.4 -r1.126.2.5 src/sys/kern/vfs_cache.c
cvs rdiff -u -r1.47.2.2 -r1.47.2.3 src/sys/sys/namei.src
cvs rdiff -u -r1.19.2.2 -r1.19.2.3 src/sys/sys/vnode_impl.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
