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Message-Id: <20210104152357.d56d10e0443bae984a174f18@linux-foundation.org>
Date: Mon, 4 Jan 2021 15:23:57 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Matthew Wilcox <willy@...radead.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 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??)
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