linux-kernel - Re: [PATCH 00/13] KVM: MMU: fast page fault

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: <4F8D6503.4040800@redhat.com>
Date:	Tue, 17 Apr 2012 15:41:39 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
CC:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	kvm-ppc@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>,
	Xiao Guangrong <xiaoguangrong.eric@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 00/13] KVM: MMU: fast page fault

On 04/17/2012 03:37 PM, Takuya Yoshikawa wrote:
> On Tue, 17 Apr 2012 10:51:40 +0300
> Avi Kivity <avi@...hat.com> wrote:
>
> > That's true with the write protect everything approach we use now.  But
> > it's not true with range-based write protection, where you issue
> > GET_DIRTY_LOG on a range of pages and only need to re-write-protect them.
> > 
> > (the motivation for that is to decrease the time between GET_DIRTY_LOG
> > and sending the page; as the time increases, the chances that the page
> > got re-dirtied go up).
>
> Thank you for explaining this.
>
> I was planning to give the userspace more freedom.
>
> Since there are many known algorithms to predict hot memory pages,
> the userspace will be able to tune the frequency of GET_DIRTY_LOG for such
> parts not to get too many faults repeatedly, if we can restrict the range
> of pages to protect.
>
> This is the fine-grained control.

Do you want per-page control, or just range-based?

-- 
error compiling committee.c: too many arguments to function

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/