Searched hist:f648022faa68ef76058aa121d1aa3a967d59cae8 (Results 1 – 3 of 3) sorted by relevance
| /openbmc/linux/fs/nfs/ |
| H A D | Kconfig | diff f648022faa68ef76058aa121d1aa3a967d59cae8 Wed Feb 23 10:31:51 CST 2022 Trond Myklebust <trond.myklebust@hammerspace.com> 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>
|
| H A D | dir.c | diff f648022faa68ef76058aa121d1aa3a967d59cae8 Wed Feb 23 10:31:51 CST 2022 Trond Myklebust <trond.myklebust@hammerspace.com> 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>
|
| /openbmc/linux/include/linux/ |
| H A D | nfs_fs.h | diff f648022faa68ef76058aa121d1aa3a967d59cae8 Wed Feb 23 10:31:51 CST 2022 Trond Myklebust <trond.myklebust@hammerspace.com> 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>
|