Re: [PATCH] mm: introduce statistic for inode's gen&tier

[Christoph Hellwig]

On Tue, Jun 27, 2023 at 05:17:18PM +0800, zhaoyang.huang wrote:
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -434,6 +434,8 @@ struct address_space {
>  	struct rb_root_cached	i_mmap;
>  	struct rw_semaphore	i_mmap_rwsem;
>  	unsigned long		nrpages;
> +	atomic_long_t		gen;
> +	atomic_long_t		tier;

This increases the size of the inode by 16 byes, and better have really
good data supporting it, as increases of the inode size impact a lot
of workloads.