Re: [PATCH 05/39] vfs: optionally don't account file in nr_files

From: Christoph Hellwig
Date: Mon Jun 04 2018 - 04:47:46 EST


On Tue, May 29, 2018 at 04:43:05PM +0200, Miklos Szeredi 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.

But that overhead is exactly what nr_files accounts for, so this looks
bogus to me.