linux-kernel - Re: [PATCH v3 1/2] mm/sparse: add sparse_init

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Message-ID: <CAGM2reatQzroymAb8kaPKgd8sEehtScH9DAELeWpYCaNNnAU6w@mail.gmail.com>
Date:   Sun, 1 Jul 2018 23:03:24 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     bhe@...hat.com
Cc:     Steven Sistare <steven.sistare@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kirill.shutemov@...ux.intel.com, Michal Hocko <mhocko@...e.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        dan.j.williams@...el.com, jack@...e.cz, jglisse@...hat.com,
        Souptick Joarder <jrdr.linux@...il.com>,
        gregkh@...uxfoundation.org, Vlastimil Babka <vbabka@...e.cz>,
        Wei Yang <richard.weiyang@...il.com>, dave.hansen@...el.com,
        rientjes@...gle.com, mingo@...nel.org, osalvador@...hadventures.net
Subject: Re: [PATCH v3 1/2] mm/sparse: add sparse_init_nid()

> Ah, yes, I misunderstood it, sorry for that.
>
> Then I have only one concern, for vmemmap case, if one section doesn't
> succeed to populate its memmap, do we need to skip all the remaining
> sections in that node?

Yes, in sparse_populate_node() we have the following:

294         for (pnum = pnum_begin; map_index < map_count; pnum++) {
295                 if (!present_section_nr(pnum))
296                         continue;
297                 if (!sparse_mem_map_populate(pnum, nid, NULL))
298                         break;

So, on the first failure, we even stop trying to populate other
sections. No more memory to do so.

Pavel