diff options
author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-02-23 19:31:51 +0300 |
---|---|---|
committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-03-02 16:43:39 +0300 |
commit | f648022faa68ef76058aa121d1aa3a967d59cae8 (patch) | |
tree | 45c9e48027420cf9be617e967b178b06a3d40160 /fs/nfs/nfstrace.h | |
parent | 9332cf14e2db4253bec827da66bd95e6c0f6a2f3 (diff) | |
download | linux-f648022faa68ef76058aa121d1aa3a967d59cae8.tar.xz |
NFS: Convert readdir page cache to use a cookie based index
Instead of using a linear index to address the pages, use the cookie of
the first entry, since that is what we use to match the page anyway.
This allows us to avoid re-reading the entire cache on a seekdir() type
of operation. The latter is very common when re-exporting NFS, and is a
major performance drain.
The change does affect our duplicate cookie detection, since we can no
longer rely on the page index as a linear offset for detecting whether
we looped backwards. However since we no longer do a linear search
through all the pages on each call to nfs_readdir(), this is less of a
concern than it was previously.
The other downside is that invalidate_mapping_pages() no longer can use
the page index to avoid clearing pages that have been read. A subsequent
patch will restore the functionality this provides to the 'ls -l'
heuristic.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/nfstrace.h')
0 files changed, 0 insertions, 0 deletions