linux-kernel - Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory barrier (v5)

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Message-ID: <1263408098.3874.19.camel@entropy>
Date:	Wed, 13 Jan 2010 10:41:38 -0800
From:	Nicholas Miell <nmiell@...cast.net>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, akpm@...ux-foundation.org,
	josh@...htriplett.org, tglx@...utronix.de, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, laijs@...fujitsu.com, dipankar@...ibm.com
Subject: Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory
 barrier (v5)

On Wed, 2010-01-13 at 13:24 -0500, Mathieu Desnoyers wrote:
> * Nicholas Miell (nmiell@...cast.net) wrote:
> 
> > The whole point of compat and incompat flags is that it allows new
> > applications to run on old kernels and either work or fail as
> > appropriate, depending on whether the new features they're using must be
> > implemented or can be silently ignored.
> 
> I see. Thanks for the explanation. Then the expedited flag should
> clearly be part of the mandatory flags.
> 
> Can you point me to other system calls that are doing this ?
> 
> Thanks,
> 
> Mathieu

Not off the top of my head, but I did steal the idea from the ext2/3/4
disk format.

-- 
Nicholas Miell <nmiell@...cast.net>

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