linux-kernel - Re: [PATCH RFC] mm/madvise: introduce MADV

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Message-Id: <254581A8-3108-436F-80AF-129B3F93CBF4@redhat.com>
Date:   Thu, 18 Feb 2021 12:27:14 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Rolf Eike Beer <eike-kernel@...tec.de>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        David Hildenbrand <david@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Matthew Wilcox <willy@...radead.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Minchan Kim <minchan@...nel.org>, Jann Horn <jannh@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dave Hansen <dave.hansen@...el.com>,
        Hugh Dickins <hughd@...gle.com>,
        Rik van Riel <riel@...riel.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>, linux-alpha@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linux-arch@...r.kernel.org,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory


> Am 18.02.2021 um 12:15 schrieb Rolf Eike Beer <eike-kernel@...tec.de>:
> 
> 
>> 
>>> Let's introduce MADV_POPULATE with the following semantics
>>> 1. MADV_POPULATED does not work on PROT_NONE and special VMAs. It works
>>>   on everything else.
>>> 2. Errors during MADV_POPULATED (especially OOM) are reported. If we hit
>>>   hardware errors on pages, ignore them - nothing we really can or
>>>   should do.
>>> 3. On errors during MADV_POPULATED, some memory might have been
>>>   populated. Callers have to clean up if they care.
>>> 4. Concurrent changes to the virtual memory layour are tolerated - we
>                                                    ^t
>>>   process each and every PFN only once, though.
>>> 5. If MADV_POPULATE succeeds, all memory in the range can be accessed
>>>   without SIGBUS. (of course, not if user space changed mappings in the
>>>   meantime or KSM kicked in on anonymous memory).
> 
> You are talking both about MADV_POPULATE and MADV_POPULATED here.
> 

Already fixed up :) thanks!

> Eike
>