linux-kernel - Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount

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Message-ID: <CA+55aFzhiLMdSCnePX0OgFUXo7KC+aomM8URppDuV+7xUaaSpw@mail.gmail.com>
Date:	Fri, 30 Aug 2013 13:43:11 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Waiman Long <waiman.long@...com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jeff Layton <jlayton@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount

On Fri, Aug 30, 2013 at 1:15 PM, Waiman Long <waiman.long@...com> wrote:
>
> The prepend_path() isn't all due to getcwd. The correct profile should be

Ugh. I really think that prepend_path() should just be rewritten to
run entirely under RCU.

Then we can remove *all* the stupid locking, and replace it with doing
a read-lock on the rename sequence count, and repeating if requited.

That shouldn't even be hard to do, it just requires mindless massaging
and being careful.

             Linus
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