linux-kernel - Re: [PATCH RFCv2] mm/madvise: introduce MADV_POPULATE

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Date:   Mon, 15 Mar 2021 16:03:53 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     David Hildenbrand <david@...hat.com>
Cc:     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>,
        Vlastimil Babka <vbabka@...e.cz>,
        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>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Peter Xu <peterx@...hat.com>,
        Rolf Eike Beer <eike-kernel@...tec.de>,
        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 RFCv2] mm/madvise: introduce MADV_POPULATE_(READ|WRITE)
 to prefault/prealloc memory

On Mon, Mar 15, 2021 at 01:25:40PM +0100, David Hildenbrand wrote:
> On 15.03.21 13:22, Kirill A. Shutemov wrote:
> > On Mon, Mar 08, 2021 at 05:45:20PM +0100, David Hildenbrand wrote:
> > > +			case -EHWPOISON: /* Skip over any poisoned pages. */
> > > +				start += PAGE_SIZE;
> > > +				continue;
> > 
> > Why is it good approach? It's not abvious to me.
> 
> My main motivation was to simplify return code handling. I don't want to
> return -EHWPOISON to user space

Why? Hiding the problem under the rug doesn't help anybody. SIGBUS later
is not better than an error upfront.

-- 
 Kirill A. Shutemov