linux-kernel - Re: [PATCH v2 5/5] mm/page_alloc: Only call pgdat_set_deferred

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Message-ID: <20180719135859.GA10988@techadventures.net>
Date:   Thu, 19 Jul 2018 15:58:59 +0200
From:   Oscar Salvador <osalvador@...hadventures.net>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     akpm@...ux-foundation.org, pasha.tatashin@...cle.com,
        vbabka@...e.cz, aaron.lu@...el.com, iamjoonsoo.kim@....com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH v2 5/5] mm/page_alloc: Only call pgdat_set_deferred_range
 when the system boots

On Thu, Jul 19, 2018 at 03:46:22PM +0200, Michal Hocko wrote:
> On Thu 19-07-18 15:27:40, osalvador@...hadventures.net wrote:
> > From: Oscar Salvador <osalvador@...e.de>
> > 
> > We should only care about deferred initialization when booting.
> 
> Again why is this worth doing?

Well, it is not a big win if that is what you meant.

Those two fields are only being used when dealing with deferred pages,
which only happens at boot time.

If later on, free_area_init_node gets called from memhotplug code,
we will also set the fields, although they will not be used.

Is this a problem? No, but I think it is more clear from the code if we
see when this is called.
So I would say it was only for code consistency.

If you think this this is not worth, I am ok with dropping it.

Thanks
-- 
Oscar Salvador
SUSE L3