linux-kernel - Re: [PATCH 4/6] fs: Introduce a per_cpu nr

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Message-ID: <87zljl32ka.fsf@basil.nowhere.org>
Date:	Thu, 27 Nov 2008 11:07:01 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Eric Dumazet <dada1@...mosbay.com>, Ingo Molnar <mingo@...e.hu>,
	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, Mike Galbraith <efault@....de>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>, travis <travis@....com>
Subject: Re: [PATCH 4/6] fs: Introduce a per_cpu nr_inodes

Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:
>>  
>> +int get_nr_inodes(void)
>> +{
>> +	int cpu;
>> +	int counter = 0;
>> +
>> +	for_each_possible_cpu(cpu)
>> +	    counter += per_cpu(nr_inodes, cpu);
>> +	if (counter < 0)
>> +		counter = 0;
>> +	return counter;
>> +}
>
> It would be good to get a cpu hotplug handler here and move to
> for_each_online_cpu(). People are wanting distro's to be build with
> NR_CPUS=4096.

Doesn't matter, possible cpus is always only set to what the
machine supports.

-Andi
-- 
ak@...ux.intel.com
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