linux-kernel - Re: [PATCH 3/5] lib: lockless generic and arch independent page table (gpt) v2.

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Message-ID: <CA+55aFyh1ZOuLZw5Vb_ZTYhSsbwdqRFOceYSj7nh02NmKxy4AQ@mail.gmail.com>
Date:	Mon, 10 Nov 2014 13:47:01 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jerome Glisse <j.glisse@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Joerg Roedel <joro@...tes.org>,
	Mel Gorman <mgorman@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Airlie <airlied@...hat.com>,
	Brendan Conoboy <blc@...hat.com>,
	Joe Donohue <jdonohue@...hat.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>,
	Roland Dreier <roland@...estorage.com>,
	Ben Sander <ben.sander@....com>,
	Greg Stoner <Greg.Stoner@....com>,
	John Bridgman <John.Bridgman@....com>,
	Michael Mantor <Michael.Mantor@....com>,
	Paul Blinzer <Paul.Blinzer@....com>,
	Laurent Morichetti <Laurent.Morichetti@....com>,
	Alexander Deucher <Alexander.Deucher@....com>,
	Oded Gabbay <Oded.Gabbay@....com>,
	Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 3/5] lib: lockless generic and arch independent page table
 (gpt) v2.

On Mon, Nov 10, 2014 at 1:35 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Or do you actually have a setup where actual non-CPU hardware actually
> walks the page tables you create and call "page tables"?

So just to clarify: I haven't looked at all your follow-up patches at
all, although I've seen the overviews in earlier versions. When trying
to read through the latest version, I got stuck on this one, and felt
it was crazy.

But maybe I'm misreading it and it actually has good reasons for it.
But just from the details I look at, some of it looks too incestuous
with the system (the split PTL lock use), other parts look really
really odd (like the 64-bit shift counts), and some of it looks just
plain buggy (the bitops for synchronization). And none of it is all
that easy to actually read.

                        Linus
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