Re: [PATCH 8/8] doc: update Documentation/sysctl/vm.txt

[Randy Dunlap <rdunlap@infradead.org>]

On 06/16/14 02:25, Xishi Qiu wrote:
> Update the doc.
> 
> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
> ---
>  Documentation/sysctl/vm.txt |   43 +++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 43 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
> index dd9d0e3..8008e53 100644
> --- a/Documentation/sysctl/vm.txt
> +++ b/Documentation/sysctl/vm.txt
> @@ -20,6 +20,10 @@ Currently, these files are in /proc/sys/vm:
>  
>  - admin_reserve_kbytes
>  - block_dump
> +- cache_limit_mbytes
> +- cache_limit_ratio
> +- cache_reclaim_s
> +- cache_reclaim_weight
>  - compact_memory
>  - dirty_background_bytes
>  - dirty_background_ratio
> @@ -97,6 +101,45 @@ information on block I/O debugging is in Documentation/laptops/laptop-mode.txt.
>  
>  ==============================================================
>  
> +cache_limit_mbytes
> +
> +This is used to limit page cache amount. The input unit is MB, value range
> +is from 0 to totalram_pages. If this is set to 0, it will not limit page cache.

Where does one find the value of totalram_pages?

Is totalram_pages in MB or does totalram_pages need to be divided by some value
to convert it to MB?

> +When written to the file, cache_limit_ratio will be updated too.
> +
> +The default value is 0.
> +
> +==============================================================
> +
> +cache_limit_ratio
> +
> +This is used to limit page cache amount. The input unit is percent, value
> +range is from 0 to 100. If this is set to 0, it will not limit page cache.
> +When written to the file, cache_limit_mbytes will be updated too.
> +
> +The default value is 0.
> +
> +==============================================================
> +
> +cache_reclaim_s
> +
> +This is used to reclaim page cache in circles. The input unit is second,
> +the minimum value is 0. If this is set to 0, it will disable the feature.
> +
> +The default value is 0.
> +
> +==============================================================
> +
> +cache_reclaim_weight
> +
> +This is used to speed up page cache reclaim. It depend on enabling

                                                   depends on

> +cache_limit_mbytes/cache_limit_ratio or cache_reclaim_s. Value range is
> +from 1(slow) to 100(fast).
> +
> +The default value is 1.
> +
> +==============================================================
> +
>  compact_memory
>  
>  Available only when CONFIG_COMPACTION is set. When 1 is written to the file,
> 


-- 
~Randy

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