Re: readprofile from 2.5.25 web server benchmark

[Andrew Morton]

Dave Hansen wrote:
> 
> ...
> > I'd be interested in the effect of the latter.  It's very 2.4-able.
> 
> Do you mean 2.5-able?
> http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=smptimers+2.5
> 
> I found a couple of 2.5.*teen patches, but they're miles away from
> applying cleanly.  Work for tomorrow, sigh...
> 

Nah.  I mean this technological gem:

--- 2.5.25/kernel/timer.c~timer-speedup	Tue Jul  9 00:04:33 2002
+++ 2.5.25-akpm/kernel/timer.c	Tue Jul  9 00:06:09 2002
@@ -211,6 +211,9 @@ int mod_timer(struct timer_list *timer, 
 	int ret;
 	unsigned long flags;
 
+	if (timer_pending(timer) && timer->expires == expires)
+		return 1;
+
 	spin_lock_irqsave(&timerlist_lock, flags);
 	timer->expires = expires;
 	ret = detach_timer(timer);

-