linux-kernel - Re: [RFC][PATCH 00/13] percpu rwsem -v2

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Message-ID: <CA+55aFx5u6wzpxZTp2jAwQEb8W9sG=KzU7B61XQFKSSHNTaKzw@mail.gmail.com>
Date:	Mon, 22 Jun 2015 13:06:47 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	der.herr@...r.at, Davidlohr Bueso <dave@...olabs.net>,
	Rik van Riel <riel@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC][PATCH 00/13] percpu rwsem -v2

On Mon, Jun 22, 2015 at 5:16 AM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> It further removes the stop_machine lglock usage, and with it kills lglocks.

Ok. With all the conversions, and removal of lglock, my dislike of
this goes away.

I'm somewhat worried about Daniel's report about "building a kernel
with 'make -j200' was extreme slow", but that may be due to something
else (does the machine have enough memory for "make -j200"? The kernel
compile parallelizes so well, and gcc uses so much memory, that you
need a *lot* of memory to use things like "-j200").

But assuming that gets sorted out, and somebody looks at the few file
locking performance issues, I have no objections to this series any
more.

               Linus
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