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Date:	Mon, 20 Oct 2014 16:41:45 -0700
From:	Linus Torvalds <>
To:	Peter Zijlstra <>
Cc:	Paul McKenney <>,
	Thomas Gleixner <>,
	Andrew Morton <>,
	Rik van Riel <>, Mel Gorman <>,
	Oleg Nesterov <>,
	Ingo Molnar <>,
	Minchan Kim <>,
	KAMEZAWA Hiroyuki <>,
	Al Viro <>,
	Lai Jiangshan <>,
	Davidlohr Bueso <>,
	Linux Kernel Mailing List <>,
	linux-mm <>
Subject: Re: [RFC][PATCH 4/6] SRCU free VMAs

On Mon, Oct 20, 2014 at 2:56 PM, Peter Zijlstra <> wrote:
> Manage the VMAs with SRCU such that we can do a lockless VMA lookup.

Can you explain why srcu, and not plain regular rcu?

Especially as you then *note* some of the problems srcu can have.
Making it regular rcu would also seem to make it possible to make the
seqlock be just a seqcount, no?

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