linux-kernel - Re: [PATCH v2 5/7] mm: parallelize deferred_init

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Message-ID: <20200521153903.ej4cudt3lmwlz436@ca-dmjordan1.us.oracle.com>
Date:   Thu, 21 May 2020 11:39:03 -0400
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jonathan Corbet <corbet@....net>,
        Josh Triplett <josh@...htriplett.org>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Michal Hocko <mhocko@...nel.org>, Pavel Machek <pavel@....cz>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Robert Elliott <elliott@....com>,
        Shile Zhang <shile.zhang@...ux.alibaba.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Tejun Heo <tj@...nel.org>, Zi Yan <ziy@...dia.com>,
        linux-crypto@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-s390@...r.kernel.org,
        "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 5/7] mm: parallelize deferred_init_memmap()

On Thu, May 21, 2020 at 08:00:31AM -0700, Alexander Duyck wrote:
> So I was thinking about my suggestion further and the loop at the end
> isn't quite correct as I believe it could lead to gaps. The loop on
> the end should probably be:
>                 for_each_free_mem_pfn_range_in_zone_from(i, zone, spfn, epfn) {
>                         if (epfn <= epfn_align)
>                                 continue;
>                         if (spfn < epfn_align)
>                                 spfn = epfn_align;
>                         break;
>                 }
> 
> That would generate a new range where epfn_align has actually ended
> and there is a range of new PFNs to process.

Whoops, my email crossed with yours.  Agreed, but see the other message.