linux-kernel - Re: [v2 PATCH 4/4] timers: logic to enable timer migration.

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Message-ID: <20090305162329.GA5294@redhat.com>
Date:	Thu, 5 Mar 2009 17:23:29 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	a.p.zijlstra@...llo.nl, ego@...ibm.com, tglx@...utronix.de,
	mingo@...e.hu, andi@...stfloor.org, venkatesh.pallipadi@...el.com,
	vatsa@...ux.vnet.ibm.com, arjan@...radead.org,
	svaidy@...ux.vnet.ibm.com
Subject: Re: [v2 PATCH 4/4] timers: logic to enable timer migration.

On 03/04, Arun R Bharadwaj wrote:
>
> +++ linux.trees.git/kernel/sched.c
> @@ -4009,6 +4009,11 @@ static struct {
>  	.load_balancer = ATOMIC_INIT(-1),
>  };
>
> +inline int get_nohz_load_balancer(void)

inline?

> +{
> +	return atomic_read(&nohz.load_balancer);
> +}

Shouldn't we reset .load_balancer when this CPU is CPU_DOWN'ed ?
Otherwise the timer can migrate to the dead CPU.

Oleg.

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