linux-kernel - Re: [RFC PATCH v3] sparc64: Add support for Application Data Integrity (ADI)

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Message-ID: <f33f2c3c-4ec5-423c-5d13-a4b9ab8f7a95@linux.intel.com>
Date:   Fri, 6 Jan 2017 07:36:53 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Khalid Aziz <khalid.aziz@...cle.com>,
        Michal Hocko <mhocko@...nel.org>
Cc:     Rob Gardner <rob.gardner@...cle.com>, davem@...emloft.net,
        corbet@....net, arnd@...db.de, akpm@...ux-foundation.org,
        hpa@...or.com, viro@...iv.linux.org.uk, nitin.m.gupta@...cle.com,
        chris.hyser@...cle.com, tushar.n.dave@...cle.com,
        sowmini.varadhan@...cle.com, mike.kravetz@...cle.com,
        adam.buchbinder@...il.com, minchan@...nel.org, hughd@...gle.com,
        kirill.shutemov@...ux.intel.com, keescook@...omium.org,
        allen.pais@...cle.com, aryabinin@...tuozzo.com,
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        paul.gortmaker@...driver.com, jmarchan@...hat.com,
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        tglx@...utronix.de, mingo@...hat.com, dan.j.williams@...el.com,
        iamjoonsoo.kim@....com, mgorman@...hsingularity.net,
        vdavydov.dev@...il.com, hannes@...xchg.org, namit@...are.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-arch@...r.kernel.org,
        x86@...nel.org, linux-mm@...ck.org,
        Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [RFC PATCH v3] sparc64: Add support for Application Data
 Integrity (ADI)

On 01/06/2017 07:32 AM, Khalid Aziz wrote:
> I agree with you on simplicity first. Subpage granularity is complex,
> but the architecture allows for subpage granularity. Maybe the right
> approach is to support this at page granularity first for swappable
> pages and then expand to subpage granularity in a subsequent patch?
> Pages locked in memory can already use subpage granularity with my patch.

What do you mean by "locked in memory"?  mlock()'d memory can still be
migrated around and still requires "swap" ptes, for instance.