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

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Date:	Fri, 22 Jun 2007 08:35:47 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Hellwig <hch@...radead.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

On Fri, 2007-06-22 at 09:43 +0200, Ingo Molnar wrote:
> * 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.
> 

I think the reason it was dropped was because it was part of a large
patch series that didn't make it into the kernel. And unfortunately,
this was dropped in that regard.


If you do pull this patch in, I would like to get a sign-off-by from
Dipankar and give him credit, since I think he was the original author.
I just pulled it out of the -rt branch.

-- Steve


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