RE: [f2fs-dev] [PATCH 08/12] f2fs: introduce a shrinker for mounted fs

[Chao Yu <chao2.yu@samsung.com>]

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@kernel.org]
> Sent: Tuesday, June 30, 2015 2:40 AM
> To: linux-kernel@vger.kernel.org; linux-fsdevel@vger.kernel.org;
> linux-f2fs-devel@lists.sourceforge.net
> Cc: Jaegeuk Kim
> Subject: [f2fs-dev] [PATCH 08/12] f2fs: introduce a shrinker for mounted fs
> 
> This patch introduces a shrinker targeting to reduce memory footprint consumed
> by a number of in-memory f2fs data structures.
> 
> In addition, it newly adds:
>  - sbi->umount_mutex to avoid data races on shrinker and put_super
>  - sbi->shruinker_run_no to not revisit objects
> 
> Noteh that the basic implementation was copied from fs/btrfs/shrinker.c

Great! Good to see it's being implemented in f2fs.

> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Reviewed-by: Chao Yu <chao2.yu@samsung.com>

[snip]

> @@ -1406,6 +1425,9 @@ static int __init init_f2fs_fs(void)
>  	err = f2fs_init_crypto();
>  	if (err)
>  		goto free_kset;
> +
> +	register_shrinker(&f2fs_shrinker_info);

This function can fail due to no memory, please check the return value here.

Thanks,