linux-kernel - Re: [PATCH 1/3] hugetlb: fix hugepages= entry in kernel-parameters.txt

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Message-ID: <20141117001154.GA4667@hori1.linux.bs1.fc.nec.co.jp>
Date:	Mon, 17 Nov 2014 00:11:17 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Luiz Capitulino <lcapitulino@...hat.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"isimatu.yasuaki@...fujitsu.com" <isimatu.yasuaki@...fujitsu.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"davidlohr@...com" <davidlohr@...com>
Subject: Re: [PATCH 1/3] hugetlb: fix hugepages= entry in
 kernel-parameters.txt

On Wed, Nov 12, 2014 at 05:33:11PM -0500, Luiz Capitulino wrote:
> The hugepages= entry in kernel-parameters.txt states that
> 1GB pages can only be allocated at boot time and not
> freed afterwards. This is not true since commit
> 944d9fec8d7aee, at least for x86_64.
> 
> Instead of adding arch-specifc observations to the
> hugepages= entry, this commit just drops the out of date
> information. Further information about arch-specific
> support and available features can be obtained in the
> hugetlb documentation.
> 
> Signed-off-by: Luiz Capitulino <lcapitulino@...hat.com>

Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

> ---
>  Documentation/kernel-parameters.txt | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 479f332..d919af0 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1228,9 +1228,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  			multiple times interleaved with hugepages= to reserve
>  			huge pages of different sizes. Valid pages sizes on
>  			x86-64 are 2M (when the CPU supports "pse") and 1G
> -			(when the CPU supports the "pdpe1gb" cpuinfo flag)
> -			Note that 1GB pages can only be allocated at boot time
> -			using hugepages= and not freed afterwards.
> +			(when the CPU supports the "pdpe1gb" cpuinfo flag).
>  
>  	hvc_iucv=	[S390] Number of z/VM IUCV hypervisor console (HVC)
>  			       terminal devices. Valid values: 0..8
> -- 
> 1.9.3
> 
> --
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