linux-kernel - Re: [patch] sched: align rq to cacheline boundary

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Message-ID: <20070410062421.GA23274@elte.hu>
Date:	Tue, 10 Apr 2007 08:24:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	akpm@...ux-foundation.org, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] sched: align rq to cacheline boundary


* Siddha, Suresh B <suresh.b.siddha@...el.com> 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@...el.com>

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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