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SubjectRe: [PATCH] mm/alloc: fallback to first node if the wanted node offline
On Thu, Dec 6, 2018 at 6:03 PM Pingfan Liu <kernelfans@gmail.com> wrote:
>
> [...]
> > THanks for pointing this out. It made my life easier. So It think the
> > bug is that we call init_memory_less_node from this path. I suspect
> > numa_register_memblks is the right place to do this. So I admit I
> > am not 100% sure but could you give this a try please?
> >
> Sure.
>
> > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> > index 1308f5408bf7..4575ae4d5449 100644
> > --- a/arch/x86/mm/numa.c
> > +++ b/arch/x86/mm/numa.c
> > @@ -527,6 +527,19 @@ static void __init numa_clear_kernel_node_hotplug(void)
> > }
> > }
> >
> > +static void __init init_memory_less_node(int nid)
> > +{
> > + unsigned long zones_size[MAX_NR_ZONES] = {0};
> > + unsigned long zholes_size[MAX_NR_ZONES] = {0};
> > +
> > + free_area_init_node(nid, zones_size, 0, zholes_size);
> > +
> > + /*
> > + * All zonelists will be built later in start_kernel() after per cpu
> > + * areas are initialized.
> > + */
> > +}
> > +
> > static int __init numa_register_memblks(struct numa_meminfo *mi)
> > {
> > unsigned long uninitialized_var(pfn_align);
> > @@ -592,6 +605,8 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
> > continue;
> >
> > alloc_node_data(nid);
> > + if (!end)
> > + init_memory_less_node(nid);
> > }
> >
> > /* Dump memblock with node info and return. */
> > @@ -721,21 +736,6 @@ void __init x86_numa_init(void)
> > numa_init(dummy_numa_init);
> > }
> >
> > -static void __init init_memory_less_node(int nid)
> > -{
> > - unsigned long zones_size[MAX_NR_ZONES] = {0};
> > - unsigned long zholes_size[MAX_NR_ZONES] = {0};
> > -
> > - /* Allocate and initialize node data. Memory-less node is now online.*/
> > - alloc_node_data(nid);
> > - free_area_init_node(nid, zones_size, 0, zholes_size);
> > -
> > - /*
> > - * All zonelists will be built later in start_kernel() after per cpu
> > - * areas are initialized.
> > - */
> > -}
> > -
> > /*
> > * Setup early cpu_to_node.
> > *
> > @@ -763,9 +763,6 @@ void __init init_cpu_to_node(void)
> > if (node == NUMA_NO_NODE)
> > continue;
> >
> > - if (!node_online(node))
> > - init_memory_less_node(node);
> > -
> > numa_set_node(cpu, node);
> > }
> > }
> > --
> Which commit is this patch applied on? I can not apply it on latest linux tree.
>
I applied it by manual, will see the test result. I think it should
work since you instance all the node.
But there are two things worth to consider:
-1st. why x86 do not bring up all nodes by default, apparently it will
be more simple by that way
-2nd. there are other archs, do they obey the rules?

Thanks,
Pingfan

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