linux-kernel - Re: [PATCH] mm/alloc: fallback to first node if the wanted node offline

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Message-ID: <CAFgQCTuu54oZWKq_ppEvZFb4Mz31gVmsa37gTap+e9KbE=T0aQ@mail.gmail.com>
Date:   Fri, 7 Dec 2018 22:27:13 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     mhocko@...nel.org
Cc:     Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: [PATCH] mm/alloc: fallback to first node if the wanted node offline

On Fri, Dec 7, 2018 at 10:22 PM Michal Hocko <mhocko@...nel.org> wrote:
>
> On Fri 07-12-18 21:20:17, Pingfan Liu wrote:
> [...]
> > Hi Michal,
> >
> > As I mentioned in my previous email, I have manually apply the patch,
> > and the patch can not work for normal bootup.
>
> I am sorry, I have misread your previous response. Is there anything
> interesting on the serial console by any chance?

Nothing. It need more effort to debug. But as I mentioned, enable all
of the rest possible node, then it works. Maybe it can give some help
for you.
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 1308f54..4dc497d 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -754,18 +754,23 @@ void __init init_cpu_to_node(void)
 {
        int cpu;
        u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
+       int node, nr;

        BUG_ON(cpu_to_apicid == NULL);
+       nr = cpumask_weight(cpu_possible_mask);
+
+       /* bring up all possible node, since dev->numa_node */
+       //should check acpi works for node possible,
+       for_each_node(node)
+               if (!node_online(node))
+                       init_memory_less_node(node);

        for_each_possible_cpu(cpu) {
-               int node = numa_cpu_node(cpu);
+               node = numa_cpu_node(cpu);

                if (node == NUMA_NO_NODE)
                        continue;

-               if (!node_online(node))
-                       init_memory_less_node(node);
-
                numa_set_node(cpu, node);
        }
 }

Thanks,
Pingfan