linux-kernel - Re: Alternative to signals/sys

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Message-ID: <1426367210.17565.219.camel@kernel.crashing.org>
Date:	Sun, 15 Mar 2015 08:06:50 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Michael Sullivan <sully@...lly.net>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	lttng-dev@...ts.lttng.org, Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, linux-arch@...r.kernel.org
Subject: Re: Alternative to signals/sys_membarrier() in liburcu

On Thu, 2015-03-12 at 14:12 -0700, Paul E. McKenney wrote:
> 
> Are there any architectures left that use hardware-assisted global
> TLB invalidation?  

ARM and PowerPC at least...

Cheers,
Ben.

> On such an architecture, you might not get a memory
> barrier except on the CPU executing the mprotect() or munmap().
> 
> (Here is hoping that no one does -- it is a cute abuse^Whack
> otherwise!)
> 
>   


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