linux-kernel - Re: [PATCH] avoid using smp_processor_id() in preemptible code (nr_iowait

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Message-ID: <20100616093442.GA4230@swordfish.minsk.epam.com>
Date:	Wed, 16 Jun 2010 12:34:42 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] avoid using smp_processor_id() in preemptible code
 (nr_iowait_cpu)

On (06/15/10 23:05), Arjan van de Ven wrote:
> can we do this bit once, when the ts structure gets initialized?
> it's not like the cpu value will ever change...
> 
> 
Hello Arjan,

Sure we can. The question is where is the "proper place"?
for_each_possible_cpu in __init?

or something like 

static DEFINE_PER_CPU(struct tick_sched, tick_cpu_sched);
int cpu = get_cpu();
&per_cpu(tick_cpu_sched, cpu)->cpu = cpu;
put_cpu();


	Sergey

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