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

[Steven Rostedt]

On Fri, 2007-06-22 at 09:43 +0200, Ingo Molnar wrote:
> * Christoph Hellwig <hch@xxxxxxxxxxxxx> 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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