linux-kernel - Re: [RFC PATCH v2] selinux: security: Move selinux

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Date:   Mon, 18 Jan 2021 11:45:08 +0530
From:   pnagar@...eaurora.org
To:     David Howells <dhowells@...hat.com>
Cc:     Casey Schaufler <casey@...aufler-ca.com>, arnd@...db.de,
        jmorris@...ei.org, serge@...lyn.com, paul@...l-moore.com,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        linux-arch@...r.kernel.org, psodagud@...eaurora.org,
        nmardana@...eaurora.org, dsule@...eaurora.org,
        Joe Perches <joe@...ches.com>, Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2] selinux: security: Move selinux_state to a
 separate page

On 2021-01-13 16:26, David Howells wrote:
> Casey Schaufler <casey@...aufler-ca.com> wrote:
> 
>> >> How would this interact with or complement __read_mostly?
>> >>
>> > Currently, the mechanism we are working on developing is
>> > independent of __read_mostly. This is something we can look more into
>> > while working further on the mechanism.
>> 
>> Please either integrate the two or explain how they differ.
>> It appears that you haven't considered how you might exploit
>> or expand the existing mechanism.
> 
> I think __read_mostly is about grouping stuff together that's rarely 
> going to
> be read to make the CPU's data cache more efficient.  It doesn't stop 
> people
> writing to such a variable.
> 
> David
Thank you for sharing!