linux-kernel - Re: [RFC PATCH 1/6] Convert the RCU tasklet into a softirq

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Date:	Fri, 22 Jun 2007 09:43:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, matthew.wilcox@...com,
	kuznet@....inr.ac.ru
Subject: Re: [RFC PATCH 1/6] Convert the RCU tasklet into a softirq


* Christoph Hellwig <hch@...radead.org> wrote:

> On Fri, Jun 22, 2007 at 12:00:15AM -0400, Steven Rostedt wrote:
> > I believe this was originally done by Dipankar Sarma. I pulled these
> > changes from the -rt kernel.
> > 
> > For better preformance, RCU should use a softirq instead of a
> > tasklet.
> 
> I was under the imporession we had merged this a while ago due to 
> tasklet bottlenecks on big machines.  Any reason why it has been 
> delayed so long?

i thought so too, up until a few weeks ago. I think i might have mixed 
it up mentally with the scheduler rebalancing tasklet: that was 
converted to softirqs on my request and made me forget about the RCU 
tasklet thing.

	Ingo
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