linux-kernel - Re: [PATCH 1/2] mm/page_alloc: change sysctl_lower_zone_reserve_ratio to sysctl_lowmem_reserve

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Date:	Tue, 25 Aug 2015 17:28:23 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Yaowei Bai <bywxiaobai@....com>
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, vbabka@...e.cz,
	js1304@...il.com, hannes@...xchg.org, alexander.h.duyck@...hat.com,
	sasha.levin@...cle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm/page_alloc: change
 sysctl_lower_zone_reserve_ratio to sysctl_lowmem_reserve_ratio

On Tue 25-08-15 22:01:30, Yaowei Bai wrote:
> We use sysctl_lowmem_reserve_ratio rather than sysctl_lower_zone_reserve_ratio to
> determine how aggressive the kernel is in defending lowmem from the possibility of
> being captured into pinned user memory. To avoid misleading, correct it in some
> comments.

We never had a sysctl like that AFAICS in git history.

> Signed-off-by: Yaowei Bai <bywxiaobai@....com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/page_alloc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 0a0acdb..b730f7d 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -6043,7 +6043,7 @@ void __init page_alloc_init(void)
>  }
>  
>  /*
> - * calculate_totalreserve_pages - called when sysctl_lower_zone_reserve_ratio
> + * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio
>   *	or min_free_kbytes changes.
>   */
>  static void calculate_totalreserve_pages(void)
> @@ -6087,7 +6087,7 @@ static void calculate_totalreserve_pages(void)
>  
>  /*
>   * setup_per_zone_lowmem_reserve - called whenever
> - *	sysctl_lower_zone_reserve_ratio changes.  Ensures that each zone
> + *	sysctl_lowmem_reserve_ratio changes.  Ensures that each zone
>   *	has a correct pages reserved value, so an adequate number of
>   *	pages are left in the zone after a successful __alloc_pages().
>   */
> -- 
> 1.9.1
> 
> 
> --
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-- 
Michal Hocko
SUSE Labs
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