From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Schwidefsky Subject: Re: [patch 0/6] Guest page hinting version 7. Date: Sun, 29 Mar 2009 16:23:36 +0200 Message-ID: <20090329162336.7c0700e9@skybase> References: <20090327150905.819861420@de.ibm.com> <200903281705.29798.rusty@rustcorp.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200903281705.29798.rusty@rustcorp.com.au> Sender: owner-linux-mm@kvack.org To: Rusty Russell Cc: virtualization@lists.linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.osdl.org, akpm@osdl.org, nickpiggin@yahoo.com.au, frankeh@watson.ibm.com, riel@redhat.com, hugh@veritas.com List-Id: virtualization@lists.linuxfoundation.org On Sat, 28 Mar 2009 17:05:28 +1030 Rusty Russell wrote: > On Saturday 28 March 2009 01:39:05 Martin Schwidefsky wrote: > > Greetings, > > the circus is back in town -- another version of the guest page hinting > > patches. The patches differ from version 6 only in the kernel version, > > they apply against 2.6.29. My short sniff test showed that the code > > is still working as expected. > > > > To recap (you can skip this if you read the boiler plate of the last > > version of the patches): > > The main benefit for guest page hinting vs. the ballooner is that there > > is no need for a monitor that keeps track of the memory usage of all the > > guests, a complex algorithm that calculates the working set sizes and for > > the calls into the guest kernel to control the size of the balloons. > > I thought you weren't convinced of the concrete benefits over ballooning, > or am I misremembering? The performance test I have seen so far show that the benefits of ballooning vs. guest page hinting are about the same. I am still convinced that the guest page hinting is the way to go because you do not need an external monitor. Calculating the working set size for a guest is a challenge. With guest page hinting there is no need for a working set size calculation. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org