linux-kernel - Re: [PATCH v3 1/1] mm: initialize pages on demand during boot

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Date:   Wed, 14 Feb 2018 09:16:53 -0500
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Steve Sistare <steven.sistare@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        m.mizuma@...fujitsu.com, Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        baiyaowei@...s.chinamobile.com,
        Wei Yang <richard.weiyang@...il.com>,
        Paul Burton <paul.burton@...s.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH v3 1/1] mm: initialize pages on demand during boot

Hi Sergey,

Thank you for noticing this! I will send out an updated patch soon.

Pavel

On Wed, Feb 14, 2018 at 12:08 AM, Sergey Senozhatsky
<sergey.senozhatsky.work@...il.com> wrote:
> On (02/09/18 14:22), Pavel Tatashin wrote:
> [..]
>> +/*
>> + * If this zone has deferred pages, try to grow it by initializing enough
>> + * deferred pages to satisfy the allocation specified by order, rounded up to
>> + * the nearest PAGES_PER_SECTION boundary.  So we're adding memory in increments
>> + * of SECTION_SIZE bytes by initializing struct pages in increments of
>> + * PAGES_PER_SECTION * sizeof(struct page) bytes.
>> + *
>> + * Return true when zone was grown by at least number of pages specified by
>> + * order. Otherwise return false.
>> + *
>> + * Note: We use noinline because this function is needed only during boot, and
>> + * it is called from a __ref function _deferred_grow_zone. This way we are
>> + * making sure that it is not inlined into permanent text section.
>> + */
>> +static noinline bool __init
>> +deferred_grow_zone(struct zone *zone, unsigned int order)
>> +{
>> +     int zid = zone_idx(zone);
>> +     int nid = zone->node;
>
>                 ^^^^^^^^^
>
> Should be CONFIG_NUMA dependent
>
> struct zone {
> ...
> #ifdef CONFIG_NUMA
>         int node;
> #endif
> ...
>
>         -ss
>
> --
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