Re: [PATCH] Provide an interface to limit total page cache.

["Roy Huang" <royhuang9@gmail.com>]

Hi Balbir,

Thanks for your comment.

On 1/15/07, Balbir Singh <balbir@in.ibm.com> wrote:

> wakeup_kswapd and shrink_all_memory use swappiness to determine what to reclaim
> (mapped pages or page cache).  This patch does not ensure that only
> page cache is
> reclaimed/limited. If the swappiness value is high, mapped pages will be hit.
>
You are right, it is possible to release mapped pages. It can be
avoided by add a field in "struct scan_control" to determine whether
mapped pages will be released.

> One could get similar functionality by implementing resource management.
>
> Resource  management splits tasks into groups and does management of
> resources for the
> groups rather than the whole system. Such a facility will come with a
> resource controller for
> memory (split into finer grain rss/page cache/mlock'ed memory, etc),
> one for cpu, etc.
I s there any more information in detail about resource controller?
Even there is a resource controller for tasks, all memory is also
possbile to be eaten up by page cache.
>
> Balbir
>