linux-kernel - Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD

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Message-ID: <20161026073648.GC1128@infradead.org>
Date:   Wed, 26 Oct 2016 00:36:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ming Lei <tom.leiming@...il.com>
Cc:     Andreas Dilger <adilger@...ger.ca>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Christoph Hellwig <hch@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-ext4@...r.kernel.org,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        linux-block <linux-block@...r.kernel.org>
Subject: Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if
 huge page cache enabled

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.