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| author | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-02-20 03:09:21 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-03-02 16:43:39 +0300 |
| commit | 11d03d0a1ed8dbdabab1b5ab21861ad5cad4aef2 (patch) | |
| tree | a24511916a63c257ca71b92cbe7d6bb0c222b182 /fs/nfs/dir.c | |
| parent | eace45a18ccb34a746c3060601103aa14ca29923 (diff) | |
| download | linux-11d03d0a1ed8dbdabab1b5ab21861ad5cad4aef2.tar.xz | |
NFS: Trace effects of the readdirplus heuristic
Enable tracking of when the readdirplus heuristic causes a page cache
invalidation.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/dir.c')
| -rw-r--r-- | fs/nfs/dir.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 8b25a39b1761..8a246df98db5 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1000,6 +1000,8 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) if (res == -EBADCOOKIE || res == -ENOTSYNC) { invalidate_inode_pages2(desc->file->f_mapping); desc->page_index = 0; + trace_nfs_readdir_invalidate_cache_range( + inode, 0, MAX_LFS_FILESIZE); return -EAGAIN; } return res; @@ -1014,6 +1016,9 @@ static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) invalidate_inode_pages2_range(desc->file->f_mapping, desc->page_index_max + 1, -1); + trace_nfs_readdir_invalidate_cache_range( + inode, desc->page_index_max + 1, + MAX_LFS_FILESIZE); } } res = nfs_readdir_search_array(desc); @@ -1163,7 +1168,11 @@ static void nfs_readdir_handle_cache_misses(struct inode *inode, if (desc->ctx->pos == 0 || cache_misses <= NFS_READDIR_CACHE_MISS_THRESHOLD) return; - invalidate_mapping_pages(inode->i_mapping, page_index + 1, -1); + if (invalidate_mapping_pages(inode->i_mapping, page_index + 1, -1) == 0) + return; + trace_nfs_readdir_invalidate_cache_range( + inode, (loff_t)(page_index + 1) << PAGE_SHIFT, + MAX_LFS_FILESIZE); } /* The file offset position represents the dirent entry number. A |