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authorAmir Goldstein <amir73il@gmail.com>2022-10-04 13:34:33 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2022-12-08 10:49:46 +0100
commitaf4dcb6d78b2b05a0431dfd3f67713bba8dc0900 (patch)
treea77b4e78247c6bf0d6bd70961b7e34a84211a153 /fs/overlayfs
parent8ea2876577b57805489e3044de7fcb0330c52f40 (diff)
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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.c12
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);