c/s 20599 caused the hash shift to become significantly smaller on
systems with an SRAT like this
(XEN) SRAT: Node 0 PXM 0 0-a0000
(XEN) SRAT: Node 0 PXM 0 100000-80000000
(XEN) SRAT: Node 1 PXM 1 80000000-d0000000
(XEN) SRAT: Node 1 PXM 1 100000000-130000000
Comined with the static size of the memnodemap[] array, NUMA got
therefore disabled on such systems. The backport from Linux was really
incomplete, as Linux much earlier had already introduced a dynamcially
allocated memnodemap[].
Further, doing to/from pdx translations on addresses just past a valid
range is not correct, as it may strip/fail to insert non-zero bits in
this case.
Finally, using 63 as the cover-it-all shift value is invalid on 32bit,
since pdx values are unsigned long.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2010-01-06.orig/xen/arch/x86/numa.c 2010-01-06 15:16:18.000000000 +0100
+++ 2010-01-06/xen/arch/x86/numa.c 2010-01-06 16:10:59.000000000 +0100
@@ -30,7 +30,9 @@ struct node_data node_data[MAX_NUMNODES]
/* Mapping from pdx to node id */
int memnode_shift;
-u8 memnodemap[NODEMAPSIZE];
+static typeof(*memnodemap) _memnodemap[2];
+unsigned long memnodemapsize;
+u8 *memnodemap;
unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
[0 ... NR_CPUS-1] = NUMA_NO_NODE
@@ -62,13 +64,13 @@ static int __init populate_memnodemap(co
unsigned long spdx, epdx;
int i, res = -1;
- memset(memnodemap, NUMA_NO_NODE, sizeof(memnodemap));
+ memset(memnodemap, NUMA_NO_NODE, memnodemapsize * sizeof(*memnodemap));
for (i = 0; i < numnodes; i++) {
spdx = paddr_to_pdx(nodes[i].start);
- epdx = paddr_to_pdx(nodes[i].end);
+ epdx = paddr_to_pdx(nodes[i].end - 1) + 1;
if (spdx >= epdx)
continue;
- if ((epdx >> shift) >= NODEMAPSIZE)
+ if ((epdx >> shift) >= memnodemapsize)
return 0;
do {
if (memnodemap[spdx >> shift] != NUMA_NO_NODE)
@@ -86,6 +88,28 @@ static int __init populate_memnodemap(co
return res;
}
+static int __init allocate_cachealigned_memnodemap(void)
+{
+ unsigned long size = PFN_UP(memnodemapsize * sizeof(*memnodemap));
+ unsigned long mfn = alloc_boot_pages(size, 1);
+
+ if (!mfn) {
+ printk(KERN_ERR
+ "NUMA: Unable to allocate Memory to Node hash map\n");
+ memnodemapsize = 0;
+ return -1;
+ }
+
+ memnodemap = mfn_to_virt(mfn);
+ mfn <<= PAGE_SHIFT;
+ size <<= PAGE_SHIFT;
+ printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
+ mfn, mfn + size);
+ memnodemapsize = size / sizeof(*memnodemap);
+
+ return 0;
+}
+
/*
* The LSB of all start and end addresses in the node map is the value of the
* maximum possible shift.
@@ -99,7 +123,7 @@ static int __init extract_lsb_from_nodes
for (i = 0; i < numnodes; i++) {
spdx = paddr_to_pdx(nodes[i].start);
- epdx = paddr_to_pdx(nodes[i].end);
+ epdx = paddr_to_pdx(nodes[i].end - 1) + 1;
if (spdx >= epdx)
continue;
bitfield |= spdx;
@@ -108,9 +132,10 @@ static int __init extract_lsb_from_nodes
memtop = epdx;
}
if (nodes_used <= 1)
- i = 63;
+ i = BITS_PER_LONG - 1;
else
i = find_first_bit(&bitfield, sizeof(unsigned long)*8);
+ memnodemapsize = (memtop >> i) + 1;
return i;
}
@@ -120,6 +145,10 @@ int __init compute_hash_shift(struct nod
int shift;
shift = extract_lsb_from_nodes(nodes, numnodes);
+ if (memnodemapsize <= ARRAY_SIZE(_memnodemap))
+ memnodemap = _memnodemap;
+ else if (allocate_cachealigned_memnodemap())
+ return -1;
printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
shift);
@@ -233,8 +262,8 @@ void __init numa_initmem_init(unsigned l
(u64)start_pfn << PAGE_SHIFT,
(u64)end_pfn << PAGE_SHIFT);
/* setup dummy node covering all memory */
- memnode_shift = 63;
- memnodemap[0] = 0;
+ memnode_shift = BITS_PER_LONG - 1;
+ memnodemap = _memnodemap;
nodes_clear(node_online_map);
node_set_online(0);
for (i = 0; i < NR_CPUS; i++)
--- 2010-01-06.orig/xen/include/asm-x86/numa.h 2010-01-06 15:16:18.000000000
+0100
+++ 2010-01-06/xen/include/asm-x86/numa.h 2010-01-06 15:15:41.000000000
+0100
@@ -25,7 +25,6 @@ extern int pxm_to_node(int nid);
#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
#define VIRTUAL_BUG_ON(x)
-#define NODEMAPSIZE 0xfff
extern void numa_add_cpu(int cpu);
extern void numa_init_array(void);
@@ -51,7 +50,8 @@ static inline void clear_node_cpumask(in
/* Simple perfect hash to map pdx to node numbers */
extern int memnode_shift;
-extern u8 memnodemap[NODEMAPSIZE];
+extern unsigned long memnodemapsize;
+extern u8 *memnodemap;
struct node_data {
unsigned long node_start_pfn;
@@ -64,7 +64,7 @@ extern struct node_data node_data[];
static inline __attribute__((pure)) int phys_to_nid(paddr_t addr)
{
unsigned nid;
- VIRTUAL_BUG_ON((paddr_to_pdx(addr) >> memnode_shift) >= NODEMAPSIZE);
+ VIRTUAL_BUG_ON((paddr_to_pdx(addr) >> memnode_shift) >= memnodemapsize);
nid = memnodemap[paddr_to_pdx(addr) >> memnode_shift];
VIRTUAL_BUG_ON(nid >= MAX_NUMNODES || !node_data[nid]);
return nid;
xen-x86-numa-node-map.patch
Description: Text document
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