linux-kernel - Re: [PATCH v6 0/8] block: prepare for multipage bvecs

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Message-ID: <575993EA.3010005@kernel.dk>
Date:	Thu, 9 Jun 2016 10:06:02 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Ming Lei <ming.lei@...onical.com>, Jens Axboe <axboe@...com>,
	linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	"open list:DRBD DRIVER" <drbd-dev@...ts.linbit.com>,
	Jan Kara <jack@...e.cz>, Joe Thornber <ejt@...hat.com>,
	Keith Busch <keith.busch@...el.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Michal Hocko <mhocko@...e.com>,
	Mike Snitzer <snitzer@...hat.com>, NeilBrown <neilb@...e.com>,
	Sagi Grimberg <sagig@...lanox.com>, Shaohua Li <shli@...com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Tejun Heo <tj@...nel.org>,
	"open list:XFS FILESYSTEM" <xfs@....sgi.com>
Subject: Re: [PATCH v6 0/8] block: prepare for multipage bvecs

On 05/30/2016 07:34 AM, Ming Lei wrote:
> Hi,
>
> Interests[1] have been shown in multipage bvecs, so this patchset
> try to prepare for the support and do two things:
>
> 1) the 1st 4 patches use bvec iterator to implement iterate_bvec(),
> then we can drop the non-standard way for iterating bvec, which
> can be thought as a good cleanup for lib/iov_iter.c
>
> 2) remove BIO_MAX_SECTORS and makre BIO_MAX_SIZE as obsolete, and
> now there is only one user for each. Once multipage bvecs is introduced,
> one bio may hold lots of sectors, and we should always use sort of
> BIO_MAX_VECS which should be introduced in future and is similiar
> with current BIO_MAX_PAGES.
>
> The only functional change is iterate_bvec():lib/iov_iter.c
>
> xfstests(-a auto) over loop aio is run for ext4/xfs to verify
> the change and no regression found with this patchset.

Added patches 1-7, still waiting for an answer on my reply to #8.

-- 
Jens Axboe