linux-kernel - Re: [PATCH 0/5] kvm: memslots lookup optimization

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Message-ID: <20141202085721.2c328a40@nial.usersys.redhat.com>
Date:	Tue, 2 Dec 2014 08:57:21 +0100
From:	Igor Mammedov <imammedo@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 0/5] kvm: memslots lookup optimization

On Mon, 01 Dec 2014 18:38:34 +0100
Paolo Bonzini <pbonzini@...hat.com> wrote:

> 
> 
> On 01/12/2014 18:29, Igor Mammedov wrote:
> > Series speed-ups GFN to memslot lookup time by:
> >  * introducing LRU cache, which improves looukup time for
> >    same slot workload (typically boot time of Windows and Linux guest)
> >  * switching to binary search for GFN to memslot lookup,
> >    improving lookup time with large amount of memory slots
> > 
> > Igor Mammedov (5):
> >   kvm: update_memslots: drop not needed check for the same number of
> >     pages
> >   kvm: update_memslots: drop not needed check for the same slot
> >   kvm: search_memslots: add simple LRU memslot caching
> >   kvm: change memslot sorting rule from size to GFN
> >   kvm: optimize GFN to memslot lookup with large slots amount
> > 
> >  include/linux/kvm_host.h | 28 +++++++++++++++++++++++-----
> >  virt/kvm/kvm_main.c      | 46 ++++++++++++++++++++++++++--------------------
> >  2 files changed, 49 insertions(+), 25 deletions(-)
> > 
> 
> Applied patches 1-3 for now, I'm not in the mood for proving that the
> binary search is correct. :)
Following write up could help with improving a proving mood :)
http://community.topcoder.com/tc?module=Static&d1=tutorials&d2=binarySearch


> 
> Paolo

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