Messages in this thread | | | Subject | Re: [PATCH] sched: remove redundant check in select_task_rq_fair | From | Peter Zijlstra <> | Date | Tue, 07 Jun 2011 12:09:21 +0200 |
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On Tue, 2011-06-07 at 15:34 +0530, Nikunj A. Dadhania wrote: > On Tue, 07 Jun 2011 11:53:34 +0200, Peter Zijlstra <peterz@infradead.org> wrote: > > On Tue, 2011-06-07 at 15:18 +0530, Nikunj A. Dadhania wrote: > > > When balancing for wakeup affinity, a redundant check can removed. > > > > Yes, tempting, but no, now you've got an extra call to wake_affine(), > > which is more expensive.
> Ah, got that. How about this, it is more readable. Other options would > be to add a comment.
> - if (cpu == prev_cpu || wake_affine(affine_sd, p, sync)) > + if (cpu != prev_cpu && wake_affine(affine_sd, p, sync)) > prev_cpu = cpu;
I guess that depends on which way your head is wired and how strong your boolean algebra is.. Suresh, Mike any preference? I don't much care either way.
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