On Tue, Feb 7, 2012 at 11:04 PM, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>
> I'm trying to understand the page replacement policy in the latest LinuxI am not really sure about it. According to UTLK (I know, it is
> 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).
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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