> > But I can't see how can be useful marking the page PG_referenced before
> > return 0 if the page is young. It's not a swap cache page, it's not a
> > freeable page and shrink_mmap() can do nothing with it.
>
> > Am I missing something again ? ;)
>
> Yes. We might well have released the page before shrink_mmap() next
> comes around to it. Think about a binary which exits and is respawned.
> We want any usage information (the PG_referenced bit) to survive the
> exit() so that it is not immediately evicted from cache once the process
> exits and shrink_mmap starts taking an interest in it.
Ah cool! Thanks. I didn't though at it.
Andrea Arcangeli
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