Re: Workaround for wrapping loadaverage
From: Patrick Mau
Date: Mon Nov 08 2004 - 05:27:00 EST
On Mon, Nov 08, 2004 at 01:27:07AM -0800, Andrew Morton wrote:
> Patrick Mau <mau@xxxxxxxxxxxxx> wrote:
> > We can only account for 1024 runnable processes, since we have 22 bits
> > precision, I would like to suggest a patch to calc_load in kernel/timer.c
> It's better than wrapping to zero...
> Why do we need 11 bits after the binary point?
I tried various other combinations, the most interesting alternative was
8 bits precision. The exponential values would be:
1 / e (5/60) * 256
1 / e (5/300) * 256
1 / e (5/900) * 256
If you would use 236, 252 and 255 the last to load calculations would
get optimized into register shifts during calculation. The precision
would be bad, but I personally don't mind loosing the fraction.
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