From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
virtualization@lists.osdl.org, akpm@osdl.org,
nickpiggin@yahoo.com.au, frankeh@watson.ibm.com,
hugh@veritas.com
Subject: Re: [patch 6/6] Guest page hinting: s390 support.
Date: Wed, 12 Mar 2008 17:28:05 +0100 [thread overview]
Message-ID: <1205339285.8851.13.camel@localhost> (raw)
In-Reply-To: <47D802A2.1030406@goop.org>
On Wed, 2008-03-12 at 09:19 -0700, Jeremy Fitzhardinge wrote:
> Martin Schwidefsky wrote:
> > The state transitions (a diagram would be nicer but that is too hard
> > to do in ascii art...):
> > {Ur,Sr,Vr,Pr}: a resident page will change its block usage state if the
> > guest requests it with page_set_{unused,stable,volatile}.
> > {Uz,Sz,Vz}: a logically zero page will change its block usage state if the
> > guest requests it with page_set_{unused,stable,volatile}. The
> > guest can't create the Pz state, the state will be Vz instead.
> > Ur -> Uz: the host system can remove an unused, resident page from memory
> > Sz -> Sr: on first access a stable, logically zero page will become resident
> > Sr -> Sp: the host system can swap a stable page to disk
> > Sp -> Sr: a guest access to a Sp page forces the host to retrieve it
> > Vr -> Vz: the host can discard a volatile page
> > Sp -> Uz: a page preserved by the host will be removed if the guest sets
> > the block usage state to unused.
> > Sp -> Vz: a page preserved by the host will be discarded if the guest sets
> > the block usage state to volatile.
> > Pr -> Sp: the host can move a page from Pr to Sp if it discovers that the
> > page is dirty while trying to discard the page. The page content is
> > written to the paging device.
> > Pr -> Vz: the host can discard a Pr page. The Pz state is replaced by the
> > Vz state.
>
> I created the attached .dot graph based purely on this description. It
> looks reasonable, but I didn't see how a page enters a Pr state.
That is the first block of state transitions: {Ur,Sr,Vr,Pr}
You can go from any of the four states to any of the remaining three.
--
blue skies,
Martin.
"Reality continues to ruin my life." - Calvin.
next prev parent reply other threads:[~2008-03-12 16:28 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-12 13:21 [patch 0/6] Guest page hinting version 6 Martin Schwidefsky
2008-03-12 13:21 ` [patch 1/6] Guest page hinting: core + volatile page cache Martin Schwidefsky
2008-03-12 23:12 ` Rusty Russell
2008-03-13 9:24 ` Martin Schwidefsky
2008-03-12 13:21 ` [patch 2/6] Guest page hinting: volatile swap cache Martin Schwidefsky
2008-03-12 13:21 ` [patch 3/6] Guest page hinting: mlocked pages Martin Schwidefsky
2008-03-12 23:27 ` Rusty Russell
2008-03-13 9:13 ` Martin Schwidefsky
2008-03-12 13:21 ` [patch 4/6] Guest page hinting: writable page table entries Martin Schwidefsky
2008-03-12 23:35 ` Rusty Russell
2008-03-13 9:11 ` Martin Schwidefsky
2008-03-12 13:21 ` [patch 5/6] Guest page hinting: minor fault optimization Martin Schwidefsky
2008-03-12 13:21 ` [patch 6/6] Guest page hinting: s390 support Martin Schwidefsky
2008-03-12 16:19 ` Jeremy Fitzhardinge
2008-03-12 16:28 ` Martin Schwidefsky [this message]
2008-03-12 16:44 ` Jeremy Fitzhardinge
2008-03-12 16:59 ` Martin Schwidefsky
2008-03-12 17:48 ` Jeremy Fitzhardinge
2008-03-12 20:04 ` Anthony Liguori
2008-03-12 20:45 ` Jeremy Fitzhardinge
2008-03-12 20:56 ` Anthony Liguori
2008-03-12 21:36 ` Jeremy Fitzhardinge
2008-03-13 9:45 ` Martin Schwidefsky
2008-03-13 16:07 ` Jeremy Fitzhardinge
2008-03-13 16:17 ` Jeremy Fitzhardinge
2008-03-13 16:55 ` Martin Schwidefsky
2008-03-13 17:05 ` Jeremy Fitzhardinge
2008-03-13 17:23 ` Martin Schwidefsky
2008-03-13 9:42 ` Martin Schwidefsky
2008-03-13 9:36 ` Martin Schwidefsky
2008-03-13 9:32 ` Martin Schwidefsky
2008-03-12 22:41 ` [patch 0/6] Guest page hinting version 6 Rusty Russell
2008-03-13 9:47 ` Martin Schwidefsky
2008-03-13 16:57 ` Hugh Dickins
2008-03-13 17:14 ` Martin Schwidefsky
2008-03-13 17:45 ` Zachary Amsden
2008-03-13 19:45 ` Andrea Arcangeli
2008-03-13 21:41 ` Zachary Amsden
2008-03-13 18:41 ` Jeremy Fitzhardinge
2008-03-13 18:55 ` Hugh Dickins
2008-03-13 19:53 ` Zachary Amsden
2008-03-14 18:30 ` Jeremy Fitzhardinge
2008-03-14 21:32 ` Zachary Amsden
2008-03-14 21:37 ` Jeremy Fitzhardinge
2008-03-17 9:21 ` Martin Schwidefsky
2008-05-06 15:33 ` Martin Schwidefsky
2008-05-06 19:46 ` Rik van Riel
2008-05-07 3:49 ` Zachary Amsden
2008-05-07 7:00 ` Martin Schwidefsky
-- strict thread matches above, loose matches on Subject: below --
2009-03-27 15:09 [patch 0/6] Guest page hinting version 7 Martin Schwidefsky
2009-03-27 15:09 ` [patch 6/6] Guest page hinting: s390 support Martin Schwidefsky
2009-04-01 16:18 ` Rik van Riel
2007-06-28 16:40 [patch 0/6] resend: guest page hinting version 5 Martin Schwidefsky
2007-06-28 16:40 ` [patch 6/6] Guest page hinting: s390 support Martin Schwidefsky
2007-05-11 13:58 [patch 0/6] [rfc] guest page hinting version 5 Martin Schwidefsky
2007-05-11 13:58 ` [patch 6/6] Guest page hinting: s390 support Martin Schwidefsky
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