linux-kernel - Re: [PATCH] mm: introduce MADV_CLR

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Message-ID: <20170531154625.GC302@redhat.com>
Date:   Wed, 31 May 2017 17:46:25 +0200
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Mike Rapoprt <rppt@...ux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        linux-mm <linux-mm@...ck.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH] mm: introduce MADV_CLR_HUGEPAGE

On Wed, May 31, 2017 at 04:32:17PM +0200, Michal Hocko wrote:
> I would assume such a patch would be backported to stable trees because
> to me it sounds like the current semantic is simply broken and needs
> fixing anyway but it shouldn't be much different from any other bugs.

So the program would need then to check also for the -stable minor
number where the patch was backported to in addition of any enterprise
kernel backport versioning.

> This is far from ideal from the "guarantee POV" of course.

Agree it's far from ideal and lack of guarantee at least for CRIU
means silent random memory corruption.