linux-ext4 - Re: [PATCH V12 17/20] block: always define BIO_MAX

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Date:   Mon, 26 Nov 2018 14:44:39 -0800
From:   Omar Sandoval <osandov@...ndov.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Theodore Ts'o <tytso@....edu>, Omar Sandoval <osandov@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, David Sterba <dsterba@...e.com>,
        linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        Christoph Hellwig <hch@....de>, linux-ext4@...r.kernel.org,
        Coly Li <colyli@...e.de>, linux-bcache@...r.kernel.org,
        Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: Re: [PATCH V12 17/20] block: always define BIO_MAX_PAGES as 256

On Mon, Nov 26, 2018 at 10:17:17AM +0800, Ming Lei wrote:
> Now multi-page bvec can cover CONFIG_THP_SWAP, so we don't need to
> increase BIO_MAX_PAGES for it.
> 
> CONFIG_THP_SWAP needs to split one THP into normal pages and adds
> them all to one bio. With multipage-bvec, it just takes one bvec to
> hold them all.
> 
> Reviewed-by: Christoph Hellwig <hch@....de>

Reviewed-by: Omar Sandoval <osandov@...com>

> Signed-off-by: Ming Lei <ming.lei@...hat.com>
> ---
>  include/linux/bio.h | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index 5505f74aef8b..7be48c55b14a 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -34,15 +34,7 @@
>  #define BIO_BUG_ON
>  #endif
>  
> -#ifdef CONFIG_THP_SWAP
> -#if HPAGE_PMD_NR > 256
> -#define BIO_MAX_PAGES		HPAGE_PMD_NR
> -#else
>  #define BIO_MAX_PAGES		256
> -#endif
> -#else
> -#define BIO_MAX_PAGES		256
> -#endif
>  
>  #define bio_prio(bio)			(bio)->bi_ioprio
>  #define bio_set_prio(bio, prio)		((bio)->bi_ioprio = prio)
> -- 
> 2.9.5
>