diff options
-rw-r--r-- | llvm/include/llvm/Support/CachePruning.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/llvm/include/llvm/Support/CachePruning.h b/llvm/include/llvm/Support/CachePruning.h index d82b194a43e..cf3f8ec67a5 100644 --- a/llvm/include/llvm/Support/CachePruning.h +++ b/llvm/include/llvm/Support/CachePruning.h @@ -52,8 +52,11 @@ struct CachePruningPolicy { /// the number of files based pruning. /// /// This defaults to 1000000 because with that many files there are - /// diminishing returns on the effectiveness of the cache, and file - /// systems have a limit on total number of files. + /// diminishing returns on the effectiveness of the cache. Some systems have a + /// limit on total number of files, and some also limit the number of files + /// per directory, such as Linux ext4, with the default setting (block size is + /// 4096 and large_dir disabled), there is a per-directory entry limit of + /// 508*510*floor(4096/(40+8))~=20M for average filename length of 40. uint64_t MaxSizeFiles = 1000000; }; |