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| author | Amir Goldstein <amir73il@gmail.com> | 2022-10-04 13:34:33 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2022-12-08 10:49:46 +0100 |
| commit | af4dcb6d78b2b05a0431dfd3f67713bba8dc0900 (patch) | |
| tree | a77b4e78247c6bf0d6bd70961b7e34a84211a153 /fs/overlayfs | |
| parent | 8ea2876577b57805489e3044de7fcb0330c52f40 (diff) | |
| download | linux-af4dcb6d78b2b05a0431dfd3f67713bba8dc0900.tar.bz2 | |
ovl: use plain list filler in indexdir and workdir cleanup
Those two cleanup routines are using the helper ovl_dir_read() with the
merge dir filler, which populates an rb tree, that is never used.
The index dir entry names all have a long (42 bytes) constant prefix, so it
is not surprising that perf top has demostrated high CPU usage by rb tree
population during cleanup of a large index dir:
- 9.53% ovl_fill_merge
- 78.41% ovl_cache_entry_find_link.constprop.27
+ 72.11% strncmp
Use the plain list filler that does not populate the unneeded rb tree.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/readdir.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index 2b210640036c..31227e2d85e4 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -1071,14 +1071,10 @@ static int ovl_workdir_cleanup_recurse(struct ovl_fs *ofs, const struct path *pa int err; struct inode *dir = path->dentry->d_inode; LIST_HEAD(list); - struct rb_root root = RB_ROOT; struct ovl_cache_entry *p; struct ovl_readdir_data rdd = { - .ctx.actor = ovl_fill_merge, - .dentry = NULL, + .ctx.actor = ovl_fill_plain, .list = &list, - .root = &root, - .is_lowest = false, }; bool incompat = false; @@ -1159,14 +1155,10 @@ int ovl_indexdir_cleanup(struct ovl_fs *ofs) struct inode *dir = indexdir->d_inode; struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = indexdir }; LIST_HEAD(list); - struct rb_root root = RB_ROOT; struct ovl_cache_entry *p; struct ovl_readdir_data rdd = { - .ctx.actor = ovl_fill_merge, - .dentry = NULL, + .ctx.actor = ovl_fill_plain, .list = &list, - .root = &root, - .is_lowest = false, }; err = ovl_dir_read(&path, &rdd); |