linux-kernel - Re: [PATCH] memory hotplug disable boot option

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Date:	Fri, 25 Jun 2010 11:19:13 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Nathan Fontenot <nfont@...tin.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memory hotplug disable boot option

KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> writes:

>> Proposed patch to disable memory hotplug via a boot option,
>> mem_hotplug=[on|off].  The patch only disables memory hotplug in that it 
>> prevents the creation of the memory sysfs directories for memory sections.
>> 
>> This patch is meant to help alleviate very long boot times on systems with
>> large memory (1+ TB) and many memory sections (10's of thousands).
>
> Why making simple /sys file is so slowly? Couldn't we fix such performance
> problem?

Yes I agree this really needs to be fixed properly, not hacked around
with an option. Nathan can you please post some profile logs of the long
boot times?  

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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