linux-kernel - Re: [PATCH 10/17] prmem: documentation

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Message-ID: <4124995b-4363-9b37-19b1-1879bf04978b@gmail.com>
Date:   Thu, 1 Nov 2018 01:10:30 +0200
From:   Igor Stoppa <igor.stoppa@...il.com>
To:     Andy Lutomirski <luto@...capital.net>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Tycho Andersen <tycho@...ho.ws>,
        Kees Cook <keescook@...omium.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Dave Chinner <david@...morbit.com>,
        James Morris <jmorris@...ei.org>,
        Michal Hocko <mhocko@...nel.org>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Igor Stoppa <igor.stoppa@...wei.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Laura Abbott <labbott@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 10/17] prmem: documentation



On 01/11/2018 00:57, Andy Lutomirski wrote:
> 
> 
>> On Oct 31, 2018, at 2:00 PM, Peter Zijlstra <peterz@...radead.org> wrote:



>> I _think_ the use-case for atomics is updating the reference counts of
>> objects that are in this write-rare domain. But I'm not entirely clear
>> on that myself either. I just really want to avoid duplicating that
>> stuff.
> 
> Sounds nuts. Doing a rare-write is many hundreds of cycles at best. Using that for a reference count sounds wacky.
> 
> Can we see a *real* use case before we over complicate the API?
> 


Does patch #14 of this set not qualify? ima_htable.len ?

https://www.openwall.com/lists/kernel-hardening/2018/10/23/20

--
igor