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Date: Wed, 12 Dec 2018 16:31:35 +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 Mon, Dec 10, 2018 at 8:37 PM Michal Hocko <mhocko@...nel.org> wrote:
>
[...]
>
> In other words. Does the following work? I am sorry to wildguess this
> way but I am not able to recreate your setups to play with this myself.
>
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 1308f5408bf7..d51643e10d00 100644
> --- a/arch/x86/mm/numa.c
> +++ b/arch/x86/mm/numa.c
> @@ -216,8 +216,6 @@ static void __init alloc_node_data(int nid)
>
> node_data[nid] = nd;
> memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
> -
> - node_set_online(nid);
> }
>
> /**
> @@ -527,6 +525,19 @@ 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);
> @@ -570,7 +581,7 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
> return -EINVAL;
>
> /* Finally register nodes. */
> - for_each_node_mask(nid, node_possible_map) {
> + for_each_node(nid) {
> u64 start = PFN_PHYS(max_pfn);
> u64 end = 0;
>
> @@ -592,6 +603,10 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
> continue;
>
> alloc_node_data(nid);
> + if (!end)
Here comes the bug, since !end can not reach here.
> + init_memory_less_node(nid);
> + else
> + node_set_online(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);
> }
> }
After passing extra param for earlyprintk, finally I got the
following. Please get it from attachment.
BTW, based on your patch, I tried the following, it works.
---
arch/x86/mm/numa.c | 42 +++++++++++++++++++-----------------------
1 file changed, 19 insertions(+), 23 deletions(-)
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 1308f54..4874248 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -216,7 +216,6 @@ static void __init alloc_node_data(int nid)
node_data[nid] = nd;
memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
-
node_set_online(nid);
}
@@ -527,6 +526,21 @@ 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};
+
+ alloc_node_data(nid);
+ free_area_init_node(nid, zones_size, 0, zholes_size);
+ node_set_online(nid);
+
+ /*
+ * 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);
@@ -570,7 +584,7 @@ static int __init numa_register_memblks(struct
numa_meminfo *mi)
return -EINVAL;
/* Finally register nodes. */
- for_each_node_mask(nid, node_possible_map) {
+ for_each_node(nid) {
u64 start = PFN_PHYS(max_pfn);
u64 end = 0;
@@ -581,15 +595,15 @@ static int __init numa_register_memblks(struct
numa_meminfo *mi)
end = max(mi->blk[i].end, end);
}
- if (start >= end)
- continue;
/*
* Don't confuse VM with a node that doesn't have the
* minimum amount of memory:
*/
- if (end && (end - start) < NODE_MIN_SIZE)
+ if ( start >= end || (end && (end - start) < NODE_MIN_SIZE)) {
+ init_memory_less_node(nid);
continue;
+ }
alloc_node_data(nid);
}
@@ -721,21 +735,6 @@ 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 +762,6 @@ 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);
}
}
--
1.8.3.1
> --
> Michal Hocko
> SUSE Labs
View attachment "amd_numabug.log" of type "text/x-log" (15907 bytes)
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