Re: [PATCH] NOMMU: Pages allocated to a ramfs inode's pagecache may get wrongly discarded

[KOSAKI Motohiro]

> > (1) page migration code depend on the page stay on lru.
> > (2) "taking off at reclaim time" can avoid adding lock to fastpath.
> >     anyway, complely removing from lru need something lock.
> >     we disliked it at that time.
> 
> Agreed with (1).  NOMMU can't support migration, though.  But keeping
> them off the LRU on NOMMU needs adjustment of the page cache
> read/write code in mm/filemap.c.

yes.

> I'm not quite sure I understand (2).  But never adding these pages on
> the LRU means we never have to remove them anywhere, no?

Yeah, you are right.
I was confused to munlock/shm_unlock case.



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