From: Sudarshan Rajagopalan <quic_sudaraja@quicinc.com>
To: "T.J. Alumbaugh" <talumbau@google.com>,
David Hildenbrand <david@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Suren Baghdasaryan <surenb@google.com>,
Mike Rapoport <rppt@kernel.org>,
Oscar Salvador <osalvador@suse.de>,
Anshuman Khandual <anshuman.khandual@arm.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"will@kernel.org" <will@kernel.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>
Cc: "Trilok Soni (QUIC)" <quic_tsoni@quicinc.com>,
"Sukadev Bhattiprolu (QUIC)" <quic_sukadev@quicinc.com>,
"Srivatsa Vaddagiri (QUIC)" <quic_svaddagi@quicinc.com>,
"Patrick Daly (QUIC)" <quic_pdaly@quicinc.com>
Subject: Re: [RFC] memory pressure detection in VMs using PSI mechanism for dynamically inflating/deflating VM memory
Date: Tue, 1 Aug 2023 14:20:00 -0700 [thread overview]
Message-ID: <d2dac772-af7f-6539-499a-d9980d224e67@quicinc.com> (raw)
In-Reply-To: <50f979aa-37a6-db4b-465d-1dc0a27c2dfc@quicinc.com>
On 1/23/2023 3:47 PM, Sudarshan Rajagopalan wrote:
>
> On 1/23/2023 1:26 PM, T.J. Alumbaugh wrote:
>> Hi Sudarshan,
>>
>> I had questions about the setup and another about the use of PSI.
> Thanks for your comments Alumbaugh.
>>> 1. This will be a native userspace daemon that will be running only
>>> in the Linux VM which will use virtio-mem driver that uses memory
>>> hotplug to add/remove memory. The VM (aka Secondary VM, SVM) will
>>> request for memory from the host which is Primary VM, PVM via the
>>> backend hypervisor which takes care of cross-VM communication.
>>>
>> In regards to the "PVM/SVM" nomenclature, is the implied setup one of
>> fault tolerance (i.e. the secondary is there to take over in case of
>> failure of the primary VM)? Generally speaking, are the PVM and SVM
>> part of a defined system running some workload? The context seems to
>> be that the situation is more intricate than "two virtual machines
>> running on a host", but I'm not clear how it is different from that
>> general notion.
>
> Here the Primary VM (PVM) is actually the host and we run a VM from
> this host. We simply call this newly launched VM as Secondary VM
> (SVM). Sorry for the confusion here. The secondary VM runs in a secure
> environment.
>
>>
>>> 5. Detecting decrease in memory pressure 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next prev parent reply other threads:[~2023-08-01 21:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-15 2:44 Sudarshan Rajagopalan (QUIC)
2023-01-23 21:26 ` T.J. Alumbaugh
2023-01-23 23:47 ` Sudarshan Rajagopalan
2023-08-01 21:20 ` Sudarshan Rajagopalan [this message]
2023-01-15 3:57 Sudarshan Rajagopalan
2023-01-17 15:33 ` David Hildenbrand
2023-01-17 23:45 ` Sudarshan Rajagopalan
2023-01-23 9:58 ` David Hildenbrand
2023-01-23 23:04 ` Sudarshan Rajagopalan
2023-01-24 15:20 ` David Hildenbrand
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