linux-kernel - Re: [ltt-dev] [RFC git tree] Userspace RCU (urcu) for Linux (repost)

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Message-ID: <8bd0f97a0902140937v22917306m44e062d5b0dfacf6@mail.gmail.com>
Date:	Sat, 14 Feb 2009 12:37:01 -0500
From:	Mike Frysinger <vapier.adi@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Bryan Wu <cooloney@...nel.org>, linux-kernel@...r.kernel.org,
	ltt-dev@...ts.casi.polymtl.ca,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [ltt-dev] [RFC git tree] Userspace RCU (urcu) for Linux (repost)

On Sat, Feb 14, 2009 at 10:06, Paul E. McKenney wrote:
> Other potential issues include unrelated processes that share memory via
> shmget() or mmap() -- presumably groups of such processes would need to
> be bound to a single CPU?

using PROT_WRITE with MAP_SHARED is a mess with no-mmu already ... in
other words, it isnt in use in practice as most of the time, the
kernel wont even grant it

i dont believe we've looked at shm/ipc ... i'll open a tracker item on
our side to review it
-mike
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