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

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Date:	Wed, 04 Mar 2009 08:33:09 -0800
From:	Daniel Walker <dwalker@...o99.com>
To:	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 Wed, 2009-03-04 at 17:49 +0530, Arun R Bharadwaj wrote:
> @@ -649,6 +650,16 @@ __mod_timer(struct timer_list *timer, un
>  
>         new_base = __get_cpu_var(tvec_bases);
>  
> +       current_cpu = smp_processor_id();
> +       preferred_cpu = get_nohz_load_balancer();
> +       if (enable_timer_migration && !tbase_get_pinned(timer->base)
> &&
> +                       idle_cpu(current_cpu) && preferred_cpu != -1)
> {
> +               new_base = per_cpu(tvec_bases, preferred_cpu);
> +               timer_set_base(timer, new_base);
> +               timer->expires = expires;
> +               internal_add_timer(new_base, timer);
> +               goto out_unlock;
> +       }

Are you sure this compiles w/ CONFIG_SMP=n ? It looks like
enable_timer_migration wouldn't exist in that case, but the chunks your
adding in the timer code are still using it.

Daniel

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