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From: Tejun Heo <tj@kernel.org>
To: Gu Zheng <guz.fnst@cn.fujitsu.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	linux-kernel@vger.kernel.org, laijs@cn.fujitsu.com,
	isimatu.yasuaki@jp.fujitsu.com, tangchen@cn.fujitsu.com,
	izumi.taku@jp.fujitsu.com
Subject: Re: [PATCH 1/2] x86/cpu hotplug: make apicid <--> cpuid mapping persistent
Date: Thu, 26 Mar 2015 11:13:12 -0400	[thread overview]
Message-ID: <20150326151312.GC1953@htj.duckdns.org> (raw)
In-Reply-To: <55139128.2050603@cn.fujitsu.com>

On Thu, Mar 26, 2015 at 12:55:04PM +0800, Gu Zheng wrote:
> >> +static int apicid_to_x86_cpu[MAX_LOCAL_APIC] = {
> >> +	[0 ... MAX_LOCAL_APIC - 1] = -1,
> >> +};
> > 
> > 
> > This patch cannot handle x2apic, which is 32bit.
> 
> IMO, if the apicid is too big (larger than MAX_LOCAL_APIC), we will skip
> generating a logic cpu number for it, so it seems no problem here.

You're defining 128k array on 64bit most of which will be unused on
most machines.  There is a problem with that.

Thanks.

-- 
tejun

  reply	other threads:[~2015-03-26 15:13 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-26  2:17 [PATCH 0/2] workqueue: fix a bug when numa mapping is changed Gu Zheng
2015-03-26  2:17 ` [PATCH 1/2] x86/cpu hotplug: make apicid <--> cpuid mapping persistent Gu Zheng
2015-03-26  3:19   ` Kamezawa Hiroyuki
2015-03-26  4:55     ` Gu Zheng
2015-03-26 15:13       ` Tejun Heo [this message]
2015-03-26 16:31       ` Kamezawa Hiroyuki
2015-03-30  9:58         ` Gu Zheng
2015-04-01  2:59           ` Kamezawa Hiroyuki
2015-03-26  2:17 ` [PATCH 2/2] workqueue: update per cpu workqueue's numa affinity when cpu preparing online Gu Zheng
2015-03-26  3:12 ` [PATCH 0/2] workqueue: fix a bug when numa mapping is changed Kamezawa Hiroyuki
2015-03-26  5:04   ` Gu Zheng
2015-03-26 15:18     ` Tejun Heo
2015-03-26 16:42       ` Kamezawa Hiroyuki
2015-03-30  9:49         ` Gu Zheng
2015-03-30  9:49         ` Gu Zheng
2015-03-31  6:09           ` Kamezawa Hiroyuki
2015-03-31 15:28             ` Tejun Heo
2015-04-01  2:55               ` Kamezawa Hiroyuki
2015-04-01  3:02                 ` Tejun Heo
2015-04-01  3:05                   ` Tejun Heo
2015-04-01  8:30                   ` Kamezawa Hiroyuki
2015-04-02  1:36                     ` Gu Zheng
2015-04-02  2:54                       ` Kamezawa Hiroyuki

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