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authorTrond Myklebust <trond.myklebust@hammerspace.com>2022-02-17 11:08:24 -0500
committerTrond Myklebust <trond.myklebust@hammerspace.com>2022-03-02 08:43:38 -0500
commit230bc98f7a2a49eb472d184bdec91fd3096384b3 (patch)
treef54d364b1713d267bd09b7f5499197f6173b162f /fs/nfs/inode.c
parent9c3f4d988c23d099095c8b75cbd449e0466fa102 (diff)
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/inode.c')
-rw-r--r--fs/nfs/inode.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 7cecabf57b95..bbf4357ff727 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -787,7 +787,7 @@ static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
return;
parent = dget_parent(dentry);
- nfs_force_use_readdirplus(d_inode(parent));
+ nfs_readdir_record_entry_cache_miss(d_inode(parent));
dput(parent);
}
@@ -798,7 +798,7 @@ static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
return;
parent = dget_parent(dentry);
- nfs_advise_use_readdirplus(d_inode(parent));
+ nfs_readdir_record_entry_cache_hit(d_inode(parent));
dput(parent);
}