From: Rik van Riel <riel@redhat.com>
To: Hubertus Franke <frankeh@watson.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux-kernel@vger.kernel.org, virtualization@lists.osdl.org,
akpm@osdl.org, nickpiggin@yahoo.com.au, rhim@cc.gateh.edu
Subject: Re: [patch 1/9] Guest page hinting: unused / free pages.
Date: Tue, 12 Sep 2006 21:29:45 -0400 [thread overview]
Message-ID: <45075F09.5010708@redhat.com> (raw)
In-Reply-To: <45074BD0.3060400@watson.ibm.com>
Hubertus Franke wrote:
> Rik van Riel wrote:
>> Easy enough to pass a vector of pages to the hypervisor.
>
> Rik, I thought that what we did.
> Martin, I see the code actually does it when the page goes into the
> hot/cold
> list. I can't remember conciously moving to that.
> I thought we had a decent hit on the hot/cold, so that bulking makes sense.
>
> Then the interface of bulking could be introduced and for s390 it could
> internally be implemented as a sequence of ESSA instruction.
Note that the transition _to_ volatile can also be batched
and done somewhat lazily. For frequently mmaped pages that
could end up saving us the transition the other way, too...
That could make page hinting very acceptable performance wise,
even without a millicode implementation.
--
What is important? What you want to be true, or what is true?
next prev parent reply other threads:[~2006-09-13 1:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-01 11:09 [patch 1/9] Guest page hinting: unused / free pages Martin Schwidefsky
2006-09-01 15:33 ` Dave Hansen
2006-09-01 15:43 ` Martin Schwidefsky
2006-09-01 15:56 ` Dave Hansen
2006-09-01 16:05 ` Martin Schwidefsky
2006-09-01 16:10 ` Dave Hansen
2006-09-12 22:47 ` Rik van Riel
2006-09-13 0:07 ` Hubertus Franke
2006-09-13 1:29 ` Rik van Riel [this message]
2006-09-13 8:56 ` Martin Schwidefsky
2006-09-13 12:06 ` Hubertus Franke
2006-09-13 12:45 ` Martin Schwidefsky
2006-09-13 13:06 ` Hubertus Franke
2006-09-13 14:45 ` Rik van Riel
2006-09-13 14:59 ` Martin Schwidefsky
2006-09-13 17:05 ` Hubertus Franke
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