Re: [PATCH 3/3] [RFC] tmpfs: Add FALLOC_FL_MARK_VOLATILE/UNMARK_VOLATILEhandlers

[Rik van Riel]

On 06/08/2012 11:45 PM, John Stultz wrote:

> I *think* ideally, the pages in a volatile range should be similar to
> non-dirty file-backed pages. There is a cost to restore them, but
> freeing them is very cheap. The trick is that volatile ranges introduces

Easier to mark them dirty.

> a new relationship between pages. Since the neighboring virtual pages in
> a volatile range are in effect tied together, purging one effectively
> ruins the value of keeping the others, regardless of which zone they are
> physically.

Then the volatile ->writepage function can zap the whole
object.

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