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

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Message-ID: <547DBD7E.1070402@redhat.com>
Date:	Tue, 02 Dec 2014 14:24:14 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Igor Mammedov <imammedo@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>
Subject: Re: [PATCH 0/5] kvm: memslots lookup optimization



On 02/12/2014 08:57, Igor Mammedov 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. :)

Looks good, thanks.  Gleb, any objections?

Paolo
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