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| author |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-02-17 11:08:24 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-03-02 08:43:38 -0500 |
| commit | 230bc98f7a2a49eb472d184bdec91fd3096384b3 (patch) | |
| tree | f54d364b1713d267bd09b7f5499197f6173b162f /fs/nfs/internal.h | |
| parent | NFS: Reduce use of uncached readdir (diff) | |
| download | linux-dev-230bc98f7a2a49eb472d184bdec91fd3096384b3.tar.xz linux-dev-230bc98f7a2a49eb472d184bdec91fd3096384b3.zip | |
NFS: Improve heuristic for readdirplus
The heuristic for readdirplus is designed to try to detect 'ls -l' and
similar patterns. It does so by looking for cache hit/miss patterns in
both the attribute cache and in the dcache of the files in a given
directory, and then sets a flag for the readdirplus code to interpret.
The problem with this approach is that a single attribute or dcache miss
can cause the NFS code to force a refresh of the attributes for the
entire set of files contained in the directory.
To be able to make a more nuanced decision, let's sample the number of
hits and misses in the set of open directory descriptors. That allows us
to set thresholds at which we start preferring READDIRPLUS over regular
READDIR, or at which we start to force a re-read of the remaining
readdir cache using READDIRPLUS.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/internal.h')
| -rw-r--r-- | fs/nfs/internal.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index b5398af53c7f..194840a97e3a 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -366,8 +366,8 @@ extern struct nfs_client *nfs_init_client(struct nfs_client *clp, const struct nfs_client_initdata *); /* dir.c */ -extern void nfs_advise_use_readdirplus(struct inode *dir); -extern void nfs_force_use_readdirplus(struct inode *dir); +extern void nfs_readdir_record_entry_cache_hit(struct inode *dir); +extern void nfs_readdir_record_entry_cache_miss(struct inode *dir); extern unsigned long nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc); extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, |