Miklos Szeredi <mszeredi@xxxxxxxxxx> wrote: > Stacking file operations in overlay will store an extra open file for each > overlay file opened. > > The overhead is just that of "struct file" which is about 256bytes, because > overlay already pins an extra dentry and inode when the file is open, which > add up to a much larger overhead. > > For fear of breaking working setups, don't start accounting the extra file. Sounds useful for cachefiles too, though Christoph Hellwig objected strongly last time I tried this, so you might want to check with him directly. David
