linux-kernel - Re: [PATCH] mm/page_alloc: remove the static for local variable node

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Message-ID: <20210105013026.GA175893@casper.infradead.org>
Date:   Tue, 5 Jan 2021 01:30:26 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Hui Su <sh_def@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm/page_alloc: remove the static for local variable
 node_order

On Mon, Jan 04, 2021 at 03:23:57PM -0800, Andrew Morton wrote:
> On Wed, 30 Dec 2020 12:42:33 +0000 Matthew Wilcox <willy@...radead.org> wrote:
> 
> > On Wed, Dec 30, 2020 at 07:40:14PM +0800, Hui Su wrote:
> > > local variable node_order do not need the static here.
> > 
> > It bloody well does.  It can be up to 2^10 entries on x86 (and larger
> > on others) That's 4kB which you've now moved onto the stack.
> 
> That being said, could we kmalloc the scratch area in
> __build_all_zonelists()?  And maybe remove that static spinlock?
> 
> (what blocks node and cpu hotplug in there??)

if we don't have the zonelists built yet, can slab possibly be operational?