linux-kernel - Re: [RFC PATCH 3/3] doc: add information about min_ptes

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Date:	Mon, 13 Jun 2016 21:37:07 +0300
From:	Ebru Akagunduz <ebru.akagunduz@...il.com>
To:	linux-mm@...ck.org
Cc:	hughd@...gle.com, riel@...hat.com, akpm@...ux-foundation.org,
	kirill.shutemov@...ux.intel.com, n-horiguchi@...jp.nec.com,
	aarcange@...hat.com, iamjoonsoo.kim@....com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, rientjes@...gle.com,
	vbabka@...e.cz, aneesh.kumar@...ux.vnet.ibm.com,
	hannes@...xchg.org, mhocko@...e.cz, boaz@...xistor.com,
	minchan@...nel.org
Subject: Re: [RFC PATCH 3/3] doc: add information about min_ptes_young

On Sat, Jun 11, 2016 at 10:16:01PM +0300, Ebru Akagunduz wrote:
> min_ptes_young specifies at least how many young pages needed
> to create a THP. This threshold also effects when making swapin
> readahead (if needed) to create a THP. We decide whether to make
> swapin readahed wortwhile looking the value.
> 
> /sys/kernel/mm/transparent_hugepage/khugepaged/min_ptes_young
> 
> Signed-off-by: Ebru Akagunduz <ebru.akagunduz@...il.com>
Suggested-by: Minchan Kim <minchan@...nel.org> 
> ---
Cc'ed Minchan Kim.
>  Documentation/vm/transhuge.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
> index 2ec6adb..0ae713b 100644
> --- a/Documentation/vm/transhuge.txt
> +++ b/Documentation/vm/transhuge.txt
> @@ -193,6 +193,13 @@ memory. A lower value can prevent THPs from being
>  collapsed, resulting fewer pages being collapsed into
>  THPs, and lower memory access performance.
>  
> +min_ptes_young specifies at least how many young pages needed
> +to create a THP. This threshold also effects when making swapin
> +readahead (if needed) to create a THP. We decide whether to make
> +swapin readahed wortwhile looking the value.
> +
> +/sys/kernel/mm/transparent_hugepage/khugepaged/min_ptes_young
> +
>  == Boot parameter ==
>  
>  You can change the sysfs boot time defaults of Transparent Hugepage
> -- 
> 1.9.1
>