linux-kernel - Re: [RFC][PATCH 1/2] percpu array counter like vmstat

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Date:	Thu, 1 Oct 2009 08:56:50 +0900
From:	nishimura@....nes.nec.co.jp
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 1/2] percpu array counter like vmstat

> On Wed, 30 Sep 2009 19:09:43 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> 
>> +int array_counter_init(struct array_counter *ac, int size)
>> +{
>> +	ac->v.elements = size;
>> +	ac->v.counters = alloc_percpu(s8);
> This is a bug, of course...
Yes, I was confused at that point and about to pointing it out :)

> should be
> ac->v.counters = __alloc_percpu(size, __alignof__(char));
> 
__alloc_pecpu(size * sizeof(s8), __alignof__(s8)) would be better ?
There is no actual difference, though.


Thanks,
Daisuke Nishimura.
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