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
Date: Wed, 26 Oct 2016 00:35:43 -0700
Message-ID: <20161026073543.GA1128@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>
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Cc: 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-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-block@vger.kernel.org
To: "Kirill A. Shutemov" <kirill@shutemov.name>
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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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