On 06/16/14 02:25, Xishi Qiu wrote:
> Update the doc.
>
> Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
> ---
> 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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