linux-kernel - Re: [PATCH v2 5/7] mm/page_alloc: fix doc for numa_zonelist

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Message-ID: <20130617081716.GB19194@dhcp22.suse.cz>
Date:	Mon, 17 Jun 2013 10:17:16 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Shewmaker <agshew@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Namjae Jeon <linkinjeon@...il.com>, Jan Kara <jack@...e.cz>,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/7] mm/page_alloc: fix doc for numa_zonelist_order

On Sun 16-06-13 09:14:48, Wanpeng Li wrote:
> The default zonelist order selecter will select "node" order if any node's
> DMA zone comprises greater than 70% of its local memory instead of 60%,
> according to default_zonelist_order::low_kmem_size > total * 70/100.

Hmm, interesting. This comment has been incorrect since f0c0b2b808
(change zonelist order: zonelist order selection logic).
> 
> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

> ---
>  Documentation/sysctl/vm.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
> index a5717c3..15d341a 100644
> --- a/Documentation/sysctl/vm.txt
> +++ b/Documentation/sysctl/vm.txt
> @@ -531,7 +531,7 @@ Specify "[Dd]efault" to request automatic configuration.  Autoconfiguration
>  will select "node" order in following case.
>  (1) if the DMA zone does not exist or
>  (2) if the DMA zone comprises greater than 50% of the available memory or
> -(3) if any node's DMA zone comprises greater than 60% of its local memory and
> +(3) if any node's DMA zone comprises greater than 70% of its local memory and
>      the amount of local memory is big enough.
>  
>  Otherwise, "zone" order will be selected. Default order is recommended unless
> -- 
> 1.8.1.2
> 
> --
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-- 
Michal Hocko
SUSE Labs
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