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Date: Wed, 26 Oct 2016 00:36:48 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if
 huge page cache enabled
Message-ID: <20161026073648.GC1128@infradead.org>
References: <20161025001342.76126-1-kirill.shutemov@linux.intel.com>
 <20161025001342.76126-19-kirill.shutemov@linux.intel.com>
 <20161025072122.GA21708@infradead.org>
 <20161025125431.GA22787@node.shutemov.name>
 <BD27B76A-AF34-48B9-8D4F-F69AD2C17C66@dilger.ca>
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To: Ming Lei <tom.leiming@gmail.com>
Cc: Andreas Dilger <adilger@dilger.ca>, "Kirill A. Shutemov" <kirill@shutemov.name>, Christoph Hellwig <hch@infradead.org>, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Theodore Ts'o <tytso@mit.edu>, Andreas Dilger <adilger.kernel@dilger.ca>, Jan Kara <jack@suse.com>, Andrew Morton <akpm@linux-foundation.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Hugh Dickins <hughd@google.com>, Andrea Arcangeli <aarcange@redhat.com>, Dave Hansen <dave.hansen@intel.com>, Vlastimil Babka <vbabka@suse.cz>, Matthew Wilcox <willy@infradead.org>, Ross Zwisler <ross.zwisler@linux.intel.com>, linux-ext4@vger.kernel.org, Linux FS Devel <linux-fsdevel@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, linux-block <linux-block@vger.kernel.org>

On Wed, Oct 26, 2016 at 03:30:05PM +0800, Ming Lei wrote:
> I am preparing for the multipage bvec support[1], and once it is ready the
> default 256 bvecs should be enough for normal cases.

Yes, multipage bvecs are defintively the way to got to efficiently
support I/O on huge pages.

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