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Subject: Re: [PATCH -mm] vmscan: make mapped executable pages the first class 
	citizen
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Christoph Lameter <cl@linux.com>
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>> > > Why did you said that "The page_referenced() path will only cover the ""_text_"" section" ?
>> > > Could you elaborate please ?
>> >
>> > I was under the wild assumption that only the _text_ section will be
>> > PROT_EXEC mapped.  No?
>>
>> Yes. I support your idea.
>
> Why do PROT_EXEC mapped segments deserve special treatment? What about the
> other memory segments of the process? Essentials like stack, heap and
> data segments of the libraries?

Currently, file-backed page and swap-backed page are lived in separate lru.

text section: file
stack: anon
heap: anon
data segment: anon

and, streaming IO problem don't affect swap-backed lru. it's only
file-backed lru problem.