linux-kernel - [patch 0/3] introduce sys_membarrier(): process-wide memory barrier (v8)

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Message-Id: <20100131205254.407214951@polymtl.ca>
Date:	Sun, 31 Jan 2010 15:52:54 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Nicholas Miell <nmiell@...cast.net>, laijs@...fujitsu.com,
	dipankar@...ibm.com, josh@...htriplett.org, dvhltc@...ibm.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com
Subject: [patch 0/3] introduce sys_membarrier(): process-wide memory barrier (v8)

Hi,

Here is an updated version of the sys_membarrier system call. It implements a
system call that allows userspace to distribute the overhead of memory barriers
asymmetrically. It is particularly useful for Userspace RCU (liburcu), to allow
the RCU read-side to only issue compiler barriers, matched by calls to
sys_membarrier() in the userspace synchronize_rcu().

Even though sys_membarrier should be portable to other architecture as-is
without arch-specific modifications, I propose to incrementally reserve the
system call IDs as we test it on each architecture.

Here is a version that I think should be ready for merging. It is based on the
2.6.33-rc6 kernel. I would appreciate if people who gave their Acked-by in the
RFC rounds could confirm their Acked-by following the patch set updates.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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