linux-kernel - Re: [wake_afine fixes/improvements 1/3] sched: update effective

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Date:	Mon, 17 Jan 2011 15:20:35 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Mike Galbraith <efault@....de>,
	Nick Piggin <npiggin@...nel.dk>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [wake_afine fixes/improvements 1/3] sched: update
 effective_load() to use global share weights

On Mon, 2011-01-17 at 15:11 +0100, Peter Zijlstra wrote:
> 
> > +             if (lw > 0 && wl < lw)
> > +                     wl = (wl * tg->shares) / lw;
> > +             else
> > +                     wl = tg->shares;
> 
> OK, so this computes the new load for this cpu, by taking the
> appropriate proportion of tg->shares, it clips on large wl, and does
> something funny for !lw -- on purpose? 

D'0h, when !lw, the tg is empty and we don't care what happens since it
won't get scheduled anyway..

Ok, very nice, applied!
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