page replacement policy in the latest Linux kernel

[Zheng Da]

Hello,

On Tue, Feb 7, 2012 at 11:04 PM, Mulyadi Santosa <mulyadi.santosa at gmail.com>
>
> > I'm trying to understand the page replacement policy in the latest Linux
> > kernel and reimplement a similar one in the user space.
> > As far as I can understand from ULK and the code, there are two lists:
> > active list and inactive list.
> > Here I only consider the case of the *page cache*:
> > When a page is added to the page cache (by add_to_page_cache_lru), it is
> > also added to the inactive list and its reference bit is set (by
> > mark_page_accessed).
>
> I am not really sure about it. According to UTLK (I know, it is
> dated), page goes as "inactive, not referenced" first.
>
Yes, when a page is added to a list by add_to_page_cache_lru(), it's
inactive and not referenced, but the referenced bit will be set in the same
read, so I put them together.

Please read do_generic_file_read(). If a page doesn't exist in the page
cache, it will load the page and add it to the page cache. In the same
iteration of the for loop, mark_page_accessed() is called to mark it
referenced.

So UTLK isn't wrong. It's just a little misleading.

Thanks,
Da
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