linux-kernel - Re: [PATCHv6 00/22] Transparent huge page cache: phase 1, everything but mmap()

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Message-ID: <20130926183022.GN30372@lenny.home.zabbo.net>
Date:	Thu, 26 Sep 2013 11:30:22 -0700
From:	Zach Brown <zab@...hat.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	Ning Qu <quning@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv6 00/22] Transparent huge page cache: phase 1, everything
 but mmap()

> > Sigh.  A pox on whoever thought up huge pages. 
> 
> managing 1TB+ of memory in 4K chunks is just insane.
> The question of larger pages is not "if", but only "when".

And "how"!

Sprinking a bunch of magical if (thp) {} else {} throughtout the code
looks like a stunningly bad idea to me.  It'd take real work to
restructure the code such that the current paths are a degenerate case
of the larger thp page case, but that's the work that needs doing in my
estimation.

- z
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