Re: [patch] sched: align rq to cacheline boundary
From: Ingo Molnar
Date: Tue Apr 10 2007 - 02:25:08 EST
* Siddha, Suresh B <suresh.b.siddha@xxxxxxxxx> wrote:
> Align the per cpu runqueue to the cacheline boundary. This will
> minimize the number of cachelines touched during remote wakeup.
> -static DEFINE_PER_CPU(struct rq, runqueues);
> +static DEFINE_PER_CPU(struct rq, runqueues) ____cacheline_aligned_in_smp;
ouch!! Now how did _that_ slip through. The runqueues had been
cacheline-aligned for ages. Or at least, they were supposed to be.
could you see any improvement in profiles or workloads with this patch
applied? (just curious - it's an obviously right fix)
> Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Acked-by: Ingo Molnar <mingo@xxxxxxx>
Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/