lkml.org 
[lkml]   [2005]   [Jul]   [14]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] i386: Selectable Frequency of the Timer Interrupt
FromAlan Cox <>
DateThu, 14 Jul 2005 23:37:20 +0100
> just doesn't realize that the latter is a bit more complicated exactly 
> because the latter is a hell of a lot more POWERFUL. Trying to get rid of 
> jiffies for some religious reason is _stupid_.

Getting rid of jiffies in its current form is a huge win for very
non-religious reasons. Jiffies is expensive in power management and
virtualisation because you have to maintain it.

Swap jiffies for jiffies() and the world gets a lot better. 

In actual fact you also want to fix users of

	while(time_before(foo, jiffies)) { whack(mole); }
to become

	init_timeout(&timeout);
	timeout.expires = jiffies + n
	add_timeout(&timeout);
	while(!timeout_expired(&timeout)) {}
Which is a trivial wrapper around timers as we have them now


-
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: 2005-07-15 00:47    [from the cache]
©2003-2008