linux-kernel - Re: [PATCH 21/21] xfs: Support multi-page folios

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Date:   Wed, 3 Nov 2021 09:07:25 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 21/21] xfs: Support multi-page folios

On Mon, Nov 01, 2021 at 08:39:29PM +0000, Matthew Wilcox (Oracle) wrote:
> Now that iomap has been converted, XFS is multi-page folio safe.
> Indicate to the VFS that it can now create multi-page folios for XFS.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>

Provisional
Reviewed-by: Darrick J. Wong <djwong@...nel.org>

...assuming you've run generic/521 and generic/522 (fsx) and generic/476
(fsstress) through the grinder for several days?

And just for laughs, could you run those three (for an hour or two) with

MKFS_OPTIONS='-m reflink=0,rmapbt=0 -d rtinherit=1 -r extsize=28k,rtdev=/dev/XXX'

just to see how well multipage folios deal with 4k blocks allocated in
chunks of 28k on the realtime device?  Pretty please? :D

--D

> ---
>  fs/xfs/xfs_icache.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
> index f2210d927481..804507c82455 100644
> --- a/fs/xfs/xfs_icache.c
> +++ b/fs/xfs/xfs_icache.c
> @@ -87,6 +87,7 @@ xfs_inode_alloc(
>  	/* VFS doesn't initialise i_mode or i_state! */
>  	VFS_I(ip)->i_mode = 0;
>  	VFS_I(ip)->i_state = 0;
> +	mapping_set_large_folios(VFS_I(ip)->i_mapping);
>  
>  	XFS_STATS_INC(mp, vn_active);
>  	ASSERT(atomic_read(&ip->i_pincount) == 0);
> @@ -336,6 +337,7 @@ xfs_reinit_inode(
>  	inode->i_rdev = dev;
>  	inode->i_uid = uid;
>  	inode->i_gid = gid;
> +	mapping_set_large_folios(inode->i_mapping);
>  	return error;
>  }
>  
> -- 
> 2.33.0
>