Messages in this thread | | | Date | Mon, 16 Jul 2007 16:44:09 -0400 (EDT) | From | Steven Rostedt <> | Subject | Re: [RFC PATCH 1/8] Convert the RCU tasklet into a softirq |
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On Mon, 16 Jul 2007, Linus Torvalds wrote:
> > Btw, are there any numbers on this? Is this whole thing actually > noticeable?
Besides the obvious removal of code?
The old way actually made an effort to create per_cpu tasklets! So that the tasklets *can* run simultaneously, making it in essense a softirq. Since tasklets are implemented by the softirq, with a lot of code to make a tasklet function run only on one CPU at a time, and it can run on any CPU. By converting the rcu tasklet (which had work to make it act like a softirq) to just be a softirq, we removed all the extra overhead of a tasklet.
But to answer your question. No, I didn't take any actual measurements. The changes just seemed obvious to me (and others).
-- Steve
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