From: Wanpeng Li <wanpeng.li@linux.intel.com>
To: Umesh Deshpande <udeshpa1@binghamton.edu>
Cc: kvm@vger.kernel.org
Subject: Re: EPT Accessed bit
Date: Wed, 13 Aug 2014 11:20:19 +0800 [thread overview]
Message-ID: <20140813032019.GA32167@kernel> (raw)
In-Reply-To: <CAAgWMLu8a=ZNZtq-jwWh0HnKuYJ7Wpmr-M7TdOPq26WVefvqSg@mail.gmail.com>
Hi Umesh,
On Tue, Aug 12, 2014 at 08:07:48PM -0500, Umesh Deshpande wrote:
>Hi,
>
>>From the Intel processor manual I read that accessed bit has been
>introduced in EPT. The Redhat 6 release notes mention that "Extended
>Page Table age bits enables a host to make smarter choices for
>swapping memory under memory pressure". I couldn't find any related
>patches on KVM or LKML. I was wondering if using the EPT accessed bit
>requires any support from KVM to allow the host kernel to determine
>and swap out the inactive VM pages.
>
IIUC, host tracks the EPT A bit through mmu notifier.
Regards,
Wanpeng Li
>Thanks,
>Umesh
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prev parent reply other threads:[~2014-08-13 3:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 1:07 EPT Accessed bit Umesh Deshpande
2014-08-13 3:20 ` Wanpeng Li [this message]
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