From: David Hildenbrand <david@redhat.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
fei luo <morphyluo@gmail.com>,
akpm@linux-foundation.org, arnd@arndb.de,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org
Cc: Joao Martins <joao.m.martins@oracle.com>
Subject: Re: [RFD] clear virtual machine memory when virtual machine is turned off
Date: Fri, 3 Dec 2021 19:20:45 +0100 [thread overview]
Message-ID: <1e0ce8f6-332b-399f-5ac7-5a56639172b3@redhat.com> (raw)
In-Reply-To: <e13bd5e9-981f-e2f1-fdd9-049a1926d70f@oracle.com>
On 02.12.21 18:27, Mike Kravetz wrote:
> On 12/2/21 04:47, David Hildenbrand wrote:
>> On 02.12.21 11:19, fei luo wrote:
>>>
>>> When reusing the page that has been cleared, there is no need to clear it
>>>
>>> again, which also speeds up the memory allocation of user-mode programs.
>>>
>>>
>>> Is this feature feasible?
>>
>> "init_on_free=1" for the system as a whole, which might sounds like what
>> might tackle part of your use case.
>>
>
> Certainly init_on_free will not make much difference if VMs are backed by
> hugetlb pages. We (Joao and myself) have thought about clearing hugetlb
> pages from user space in an attempt speed up launching of VMs backed by
> hugetlb pages.
>
I remember that discussion. And I also recall a discussion regarding
extending init_on_free semantics to hugetlbfs.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-12-03 18:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-02 10:19 fei luo
2021-12-02 12:47 ` David Hildenbrand
2021-12-02 17:27 ` Mike Kravetz
2021-12-03 18:20 ` David Hildenbrand [this message]
2021-12-03 2:56 ` fei luo
2021-12-03 18:20 ` David Hildenbrand
2021-12-02 10:41 [RFD] Clear " fei luo
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