linux-kernel - Re: A question on RCU vs. preempt-RCU

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Message-ID: <87obb4ngdy.fsf@rustcorp.com.au>
Date:	Tue, 18 Jun 2013 14:51:13 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Kent Overstreet <koverstreet@...gle.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: A question on RCU vs. preempt-RCU

Tejun Heo <tj@...nel.org> writes:
> Buth yeah, interesting trick.  We'll be doing IPIs, flushing TLB and
> taking faults until it hits zero.  It'll all depend on the frequency
> of preemption but given that branches don't tend to be too expensive
> on modern processors, maybe it'd be a bit too hairy for possibly
> marginal gain?

Yeah, I'm not convinced either, but I am hoping some enthusiast will run
with the idea in hope of Fame and Glory :)

Cheers,
Rusty.
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