lkml.org 
[lkml]   [2006]   [Sep]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC] exponential update_wall_time
From
Date
On Wed, 2006-09-27 at 15:05 -0700, Andrew Morton wrote:
> On Wed, 27 Sep 2006 12:35:33 -0700
> john stultz <johnstul@us.ibm.com> wrote:
>
> > + while (offset > clock->cycle_interval << (shift + 1))
> > + shift++;
>
> hurts my brain.

Yea. Its not the most obvious patch, but the complexity is pretty
isolated.

> I have a vague feeling that this can be done with
> something like ffz(~(offset/clock->cycle_interval))+epsilon, but that hurts
> my brain too.

Agreed. I don't want to obfuscate this code much more. In my opinion,
the loop is tightly bounded and not expensive enough to try to optimize.

thanks
-john


-
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: 2006-09-28 01:23    [W:0.084 / U:4.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site