linux-kernel - Re: [RFC] KVM: arm64: support enabling dirty log graually in small chunks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <a642a79ea9190542a9098e4c9dc5a9f2@kernel.org>
Date:   Tue, 10 Mar 2020 13:16:53 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     zhukeqian <zhukeqian1@...wei.com>
Cc:     kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Jay Zhou <jianjay.zhou@...wei.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [RFC] KVM: arm64: support enabling dirty log graually in small
 chunks

On 2020-03-10 08:26, zhukeqian wrote:
> Hi Marc,
> 
> On 2020/3/9 19:45, Marc Zyngier wrote:
>> Kegian,

[...]

>> Is there a userspace counterpart to it?
>> 
> As this KVM/x86 related changes have not been merged to mainline
> kernel, some little modification is needed on mainline Qemu.

Could you please point me to these changes?

> As I tested this patch on a 128GB RAM Linux VM with no huge pages, the
> time of enabling dirty log will decrease obviously.

I'm not sure how realistic that is. Not having huge pages tends to lead
to pretty bad performance in general...

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...