lkml.org 
[lkml]   [2007]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC PATCH 1/8] Convert the RCU tasklet into a softirq

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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-07-16 22:47    [W:0.050 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site