linux-kernel - Re: [PATCH 1/5] rcusync: introduce struct rcu_sync

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Message-ID: <20131004194251.GX15690@laptop.programming.kicks-ass.net>
Date:	Fri, 4 Oct 2013 21:42:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] rcusync: introduce struct rcu_sync_ops

On Fri, Oct 04, 2013 at 12:38:37PM -0700, Linus Torvalds wrote:
> On Fri, Oct 4, 2013 at 12:30 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> > As all the rcu_synchronization() methods (on non UP) are quite
> > expensive, I doubt that this optimization is worth anything.
> 
> Maybe. It just annoys me, because afaik, the function that gets called
> is always static per callsite.

Yes, very much so indeed. Worst is that we have no users of the regular
RCU and RCU_BH variants and only included them for completeness since
the general operation is just as valid for those.
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