Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled

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To: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Subject: Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 26 Oct 2016 00:35:43 -0700
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, Jan Kara <jack@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-block@xxxxxxxxxxxxxxx
In-reply-to: <20161025125431.GA22787@node.shutemov.name>
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>
User-agent: Mutt/1.6.1 (2016-04-27)

On Tue, Oct 25, 2016 at 03:54:31PM +0300, Kirill A. Shutemov wrote:
> The size of required pool depends on architecture: different architectures
> has different (huge page size)/(base page size).

Please explain first why they are required and not just nice to have.
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References:
- [PATCHv4 00/43] ext4: support of huge pages
  - From: Kirill A. Shutemov
- [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
  - From: Kirill A. Shutemov
- Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
  - From: Christoph Hellwig
- Re: [PATCHv4 18/43] block: define BIO_MAX_PAGES to HPAGE_PMD_NR if huge page cache enabled
  - From: Kirill A. Shutemov

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