On Wednesday 21 September 2005 18:50, Hugh Dickins wrote:
> On Wed, 21 Sep 2005, Blaisorblade wrote:
> > Other pages in the VMA may be unmapped, yes, but not freed. In fact,
> > they're kept in by the pagecache reference; try_to_unmap() (or better its
> > caller, shrink_list) will only actually free the page it asked for.
> Not freed in that pass, yes; but brought closer to being freed soon.
Will a page with mapcount == 0 be put in the inactive list explicitly? At next
scan PageActive will be clear, sure, and it won't be reactivated while it's
unmapped.
But references will only cause more hardware faults.
> > The only real "problem" is that we do ptep_clear_flush_young without
> > activating the page. And yes, *this* may penalize who holds a nonlinear
> > VMA. But this is probably fair, given that we're going to have trouble in
> > freeing those pages.
> Good point, I don't remember ever considering that.
> But agree it should work out fairly.
> > > mm/trash.c? I got quite excited,
> > What would that have meant?
> Trash is rubbish or garbage. Or if I trash my hotel room (not me!),
> I'd rip the washbasin off the wall, smash the mirror, throw the
> chair through the window, ... hmm, better stop this public fantasy.
Nice... hope this can get to LWN "quotes of the week" page.
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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