linux-kernel - Re: [patch 1/9] Guest page hinting: unused / free pages.

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Message-ID: <45073901.8020906@redhat.com>
Date:	Tue, 12 Sep 2006 18:47:29 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	akpm@...l.org, nickpiggin@...oo.com.au, frankeh@...son.ibm.com,
	rhim@...gateh.edu
Subject: Re: [patch 1/9] Guest page hinting: unused / free pages.

Martin Schwidefsky wrote:
> From: Martin Schwidefsky <schwidefsky@...ibm.com>
> From: Hubertus Franke <frankeh@...son.ibm.com>
> From: Himanshu Raj <rhim@...gatech.edu>
> 
> [patch 1/9] Guest page hinting: unused / free pages.
> 
> A very simple but already quite effective improvement in the handling
> of guest memory vs. host memory is to tell the host when pages are
> free. 

Would it be an idea to place this interface in-between the
per-cpu free page lists and the buddy allocator, so we can
move a batch of pages around at once and do the hinting in
a batched fashion ?

That way the overhead will be acceptable not just on S390
(where things are millicoded), but also on hypervisor based
virtualization like Xen.

Easy enough to pass a vector of pages to the hypervisor.

-- 
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