io/CopyRegularFile: skip fallocate() for small files

Not worth the system call overhead.
CM4all · Oct 18, 2024 · 40c0d80 · 40c0d80
1 parent 3b5002f
commit 40c0d80
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/io/CopyRegularFile.cxx b/src/io/CopyRegularFile.cxx
@@ -58,7 +58,8 @@ CopyRegularFile(FileDescriptor src, FileDescriptor dst, off_t size)
 
 	posix_fadvise(src.Get(), 0, size, POSIX_FADV_SEQUENTIAL);
 
-	fallocate(dst.Get(), FALLOC_FL_KEEP_SIZE, 0, size);
+	if (size > 32768)
+		fallocate(dst.Get(), FALLOC_FL_KEEP_SIZE, 0, size);
 
 	while (size > 0) {
 		std::array<std::byte, 65536> buffer;