linux-kernel - Re: [PATCH V3] KSM: allow dedup all tasks memory

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Message-ID: <CA+CK2bDPeEsFwGAQf7f=YQ+s6aUTm-ApgFd2RR5JQQr-pi-aqg@mail.gmail.com>
Date:   Tue, 13 Nov 2018 14:35:21 -0800
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Oleksandr Natalenko <oleksandr@...alenko.name>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Timofey Titovets <timofey.titovets@...esis.ru>,
        Matthew Wilcox <willy@...radead.org>, daniel@...ss.cc
Subject: Re: [PATCH V3] KSM: allow dedup all tasks memory

> Wait, what? Can you name specific ones? Nowadays, enabling KSM for
> untrusted VMs seems like a terrible idea to me, security-wise.

Of course it is not used to share data among different
customers/tenants, as far as I know it is used by Oracle Cloud to
merge the same pages in clear containers.

https://medium.com/cri-o/intel-clear-containers-and-cri-o-70824fb51811
One performance enhancing feature is the use of KSM, a recent KVM
optimized for memory sharing and boot speed. Another is the use of an
optimized Clear Containers mini-OS.

Pasha