Messages in this thread | | | Date | Mon, 16 Apr 2001 11:18:56 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: [test-PATCH] Re: [QUESTION] 2.4.x nice level |
| |
On Thu, 12 Apr 2001, Pavel Machek wrote:
> > One rule of optimization is to move any code you can outside the loop. > > Why isn't the nice_to_ticks calculation done when nice is changed > > instead of EVERY recalc.? I guess another way to ask this is, who needs > > This way change is localized very nicely, and it is "obviously right".
Except for two obvious things:
1. we need to load the nice level anyway 2. a shift takes less cycles than a load on most CPUs
Rik -- Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose...
http://www.surriel.com/ http://www.conectiva.com/ http://distro.conectiva.com.br/
- 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/
| |