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[RFC PATCH 3/3] doc: add information about min_ptes_young

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  [RFC PATCH 3/3] doc: add information about min_ptes_young Ebru Akagunduz <ebru.akagunduz@gmail.com> - 2016-06-11 21:20 +0200
    Re: [RFC PATCH 3/3] doc: add information about min_ptes_young Ebru Akagunduz <ebru.akagunduz@gmail.com> - 2016-06-13 20:40 +0200

#1420043 — [RFC PATCH 3/3] doc: add information about min_ptes_young

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@gmail.com>
---
 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

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#1421108

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@gmail.com>
Suggested-by: Minchan Kim <minchan@kernel.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
> 

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