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x86-64, NUMA: Build and use direct emulated nid -> phys nid mapping 

NUMA emulation copied physical NUMA configuration into physnodes[] and
used it to reverse-map emulated nodes to physical nodes, which is
unnecessarily convoluted.  Build emu_nid_to_phys[] array to map
emulated nids directly to the matching physical nids and use it in
numa_add_cpu().

physnodes[] will be removed with further patches.

- v2: Build failure when CONFIG_DEBUG_PER_CPU_MAPS due to missing
  local variable definition fixed.  Reported by Ingo.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Tejun Heo 2011-02-16 17:11:10 +01:00
parent d9c515eacb
commit 9d073caeb3
1 changed files with 35 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
arch/x86/mm/numa_64.c
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@ -542,7 +542,9 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
#ifdef CONFIG_NUMA_EMU
/* Numa emulation */
static struct bootnode nodes[MAX_NUMNODES] __initdata;
static struct bootnode physnodes[MAX_NUMNODES] __cpuinitdata;
static struct bootnode physnodes[MAX_NUMNODES] __initdata;
static int emu_nid_to_phys[MAX_NUMNODES] __cpuinitdata;
static char *emu_cmdline __initdata;
void __init numa_emu_cmdline(char *str)
@ -649,7 +651,8 @@ static void __init fake_physnodes(int acpi, int amd, int nr_nodes)
* allocation past addr and -1 otherwise. addr is adjusted to be at
* the end of the node.
*/
static int __init setup_node_range(int nid, u64 *addr, u64 size, u64 max_addr)
static int __init setup_node_range(int nid, int physnid,
u64 *addr, u64 size, u64 max_addr)
{
int ret = 0;
nodes[nid].start = *addr;
@ -660,6 +663,10 @@ static int __init setup_node_range(int nid, u64 *addr, u64 size, u64 max_addr)
}
nodes[nid].end = *addr;
node_set(nid, node_possible_map);
if (emu_nid_to_phys[nid] == NUMA_NO_NODE)
emu_nid_to_phys[nid] = physnid;
printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid,
nodes[nid].start, nodes[nid].end,
(nodes[nid].end - nodes[nid].start) >> 20);
@ -756,7 +763,7 @@ static int __init split_nodes_interleave(u64 addr, u64 max_addr, int nr_nodes)
if (nodes_weight(physnode_mask) + ret >= nr_nodes)
end = physnodes[i].end;
if (setup_node_range(ret++, &physnodes[i].start,
if (setup_node_range(ret++, i, &physnodes[i].start,
end - physnodes[i].start,
physnodes[i].end) < 0)
node_clear(i, physnode_mask);
@ -852,7 +859,7 @@ static int __init split_nodes_size_interleave(u64 addr, u64 max_addr, u64 size)
* later. If setup_node_range() returns non-zero, there
* is no more memory available on this physical node.
*/
if (setup_node_range(ret++, &physnodes[i].start,
if (setup_node_range(ret++, i, &physnodes[i].start,
end - physnodes[i].start,
physnodes[i].end) < 0)
node_clear(i, physnode_mask);
@ -872,6 +879,9 @@ static int __init numa_emulation(int acpi, int amd)
int num_nodes;
int i;
for (i = 0; i < MAX_NUMNODES; i++)
emu_nid_to_phys[i] = NUMA_NO_NODE;
/*
* If the numa=fake command-line contains a 'M' or 'G', it represents
* the fixed node size. Otherwise, if it is just a single number N,
@ -892,6 +902,11 @@ static int __init numa_emulation(int acpi, int amd)
if (num_nodes < 0)
return num_nodes;
/* make sure all emulated nodes are mapped to a physical node */
for (i = 0; i < ARRAY_SIZE(emu_nid_to_phys); i++)
if (emu_nid_to_phys[i] == NUMA_NO_NODE)
emu_nid_to_phys[i] = 0;
ei.nr_blks = num_nodes;
for (i = 0; i < ei.nr_blks; i++) {
ei.blk[i].start = nodes[i].start;
@ -918,7 +933,6 @@ static int __init numa_emulation(int acpi, int amd)
init_memory_mapping_high();
for_each_node_mask(i, node_possible_map)
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
setup_physnodes(0, max_addr);
fake_physnodes(acpi, amd, num_nodes);
numa_init_array();
numa_emu_dist = true;
@ -976,7 +990,11 @@ void __init initmem_init(void)
setup_physnodes(0, max_pfn << PAGE_SHIFT);
if (emu_cmdline && !numa_emulation(i == 0, i == 1))
return;
setup_physnodes(0, max_pfn << PAGE_SHIFT);
/* not emulating, build identity mapping for numa_add_cpu() */
for (j = 0; j < ARRAY_SIZE(emu_nid_to_phys); j++)
emu_nid_to_phys[j] = j;
nodes_clear(node_possible_map);
nodes_clear(node_online_map);
#endif
@ -1033,7 +1051,6 @@ int __cpuinit numa_cpu_node(int cpu)
# ifndef CONFIG_DEBUG_PER_CPU_MAPS
void __cpuinit numa_add_cpu(int cpu)
{
unsigned long addr;
int physnid, nid;
nid = numa_cpu_node(cpu);
@ -1041,26 +1058,15 @@ void __cpuinit numa_add_cpu(int cpu)
nid = early_cpu_to_node(cpu);
BUG_ON(nid == NUMA_NO_NODE || !node_online(nid));
/*
* Use the starting address of the emulated node to find which physical
* node it is allocated on.
*/
addr = node_start_pfn(nid) << PAGE_SHIFT;
for (physnid = 0; physnid < MAX_NUMNODES; physnid++)
if (addr >= physnodes[physnid].start &&
addr < physnodes[physnid].end)
break;
physnid = emu_nid_to_phys[nid];
/*
* Map the cpu to each emulated node that is allocated on the physical
* node of the cpu's apic id.
*/
for_each_online_node(nid) {
addr = node_start_pfn(nid) << PAGE_SHIFT;
if (addr >= physnodes[physnid].start &&
addr < physnodes[physnid].end)
for_each_online_node(nid)
if (emu_nid_to_phys[nid] == physnid)
cpumask_set_cpu(cpu, node_to_cpumask_map[nid]);
}
}
void __cpuinit numa_remove_cpu(int cpu)
@ -1073,21 +1079,21 @@ void __cpuinit numa_remove_cpu(int cpu)
# else /* !CONFIG_DEBUG_PER_CPU_MAPS */
static void __cpuinit numa_set_cpumask(int cpu, int enable)
{
int node = early_cpu_to_node(cpu);
struct cpumask *mask;
int i;
int nid, physnid, i;
if (node == NUMA_NO_NODE) {
nid = early_cpu_to_node(cpu);
if (nid == NUMA_NO_NODE) {
/* early_cpu_to_node() already emits a warning and trace */
return;
}
for_each_online_node(i) {
unsigned long addr;
addr = node_start_pfn(i) << PAGE_SHIFT;
if (addr < physnodes[node].start ||
addr >= physnodes[node].end)
physnid = emu_nid_to_phys[nid];
for_each_online_node(i) {
if (emu_nid_to_phys[nid] != physnid)
continue;
mask = debug_cpumask_set_cpu(cpu, enable);
if (!mask)
return;