linux-kernel - Re: [RFC PATCH] x86, numa: always initialize all possible nodes

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Message-ID: <3a7a3cf2-b7d9-719e-85b0-352be49a6d0f@intel.com>
Date:   Thu, 24 Jan 2019 11:10:50 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org
Cc:     Pingfan Liu <kernelfans@...il.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tony Luck <tony.luck@...el.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-ia64@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] x86, numa: always initialize all possible nodes

On 1/24/19 6:17 AM, Michal Hocko wrote:
> and nr_cpus set to 4. The underlying reason is tha the device is bound
> to node 2 which doesn't have any memory and init_cpu_to_node only
> initializes memory-less nodes for possible cpus which nr_cpus restrics.
> This in turn means that proper zonelists are not allocated and the page
> allocator blows up.

This looks OK to me.

Could we add a few DEBUG_VM checks that *look* for these invalid
zonelists?  Or, would our existing list debugging have caught this?

Basically, is this bug also a sign that we need better debugging around
this?