mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

[POWERPC] Fake NUMA emulation for PowerPC 

Here's a dumb simple implementation of fake NUMA nodes for PowerPC.
Fake NUMA nodes can be specified using the following command line option

numa=fake=<node range>

node range is of the format <range1>,<range2>,...<rangeN>

Each of the rangeX parameters is passed using memparse().  I find this
useful for fake NUMA emulation on my simple PowerPC machine.  I've
tested it on a non-numa box with the following arguments:

numa=fake=1G
numa=fake=1G,2G
name=fake=1G,512M,2G
numa=fake=1500M,2800M mem=3500M
numa=fake=1G mem=512M
numa=fake=1G mem=1G

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Balbir Singh 2007-12-08 09:37:14 +11:00 committed by Paul Mackerras
parent 800d68c3aa
commit 5c3f5892a2
1 changed files with 54 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
arch/powerpc/mm/numa.c
View File

@ -24,6 +24,8 @@
static int numa_enabled = 1;
static char *cmdline __initdata;
static int numa_debug;
#define dbg(args...) if (numa_debug) { printk(KERN_INFO args); }
@ -39,6 +41,43 @@ static bootmem_data_t __initdata plat_node_bdata[MAX_NUMNODES];
static int min_common_depth;
static int n_mem_addr_cells, n_mem_size_cells;
static int __cpuinit fake_numa_create_new_node(unsigned long end_pfn,
unsigned int *nid)
{
unsigned long long mem;
char *p = cmdline;
static unsigned int fake_nid = 0;
static unsigned long long curr_boundary = 0;
*nid = fake_nid;
if (!p)
return 0;
mem = memparse(p, &p);
if (!mem)
return 0;
if (mem < curr_boundary)
return 0;
curr_boundary = mem;
if ((end_pfn << PAGE_SHIFT) > mem) {
/*
* Skip commas and spaces
*/
while (*p == ',' || *p == ' ' || *p == '\t')
p++;
cmdline = p;
fake_nid++;
*nid = fake_nid;
dbg("created new fake_node with id %d\n", fake_nid);
return 1;
}
return 0;
}
static void __cpuinit map_cpu_to_node(int cpu, int node)
{
numa_cpu_lookup_table[cpu] = node;
@ -344,12 +383,14 @@ static void __init parse_drconf_memory(struct device_node *memory)
if (nid == 0xffff || nid >= MAX_NUMNODES)
nid = default_nid;
}
node_set_online(nid);
size = numa_enforce_memory_limit(start, lmb_size);
if (!size)
continue;
fake_numa_create_new_node(((start + size) >> PAGE_SHIFT), &nid);
node_set_online(nid);
add_active_range(nid, start >> PAGE_SHIFT,
(start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
}
@ -429,7 +470,6 @@ new_range:
nid = of_node_to_nid_single(memory);
if (nid < 0)
nid = default_nid;
node_set_online(nid);
if (!(size = numa_enforce_memory_limit(start, size))) {
if (--ranges)
@ -438,6 +478,9 @@ new_range:
continue;
}
fake_numa_create_new_node(((start + size) >> PAGE_SHIFT), &nid);
node_set_online(nid);
add_active_range(nid, start >> PAGE_SHIFT,
(start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
@ -461,7 +504,7 @@ static void __init setup_nonnuma(void)
unsigned long top_of_ram = lmb_end_of_DRAM();
unsigned long total_ram = lmb_phys_mem_size();
unsigned long start_pfn, end_pfn;
unsigned int i;
unsigned int i, nid = 0;
printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
top_of_ram, total_ram);
@ -471,9 +514,11 @@ static void __init setup_nonnuma(void)
for (i = 0; i < lmb.memory.cnt; ++i) {
start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
add_active_range(0, start_pfn, end_pfn);
fake_numa_create_new_node(end_pfn, &nid);
add_active_range(nid, start_pfn, end_pfn);
node_set_online(nid);
}
node_set_online(0);
}
void __init dump_numa_cpu_topology(void)
@ -702,6 +747,10 @@ static int __init early_numa(char *p)
if (strstr(p, "debug"))
numa_debug = 1;
p = strstr(p, "fake=");
if (p)
cmdline = p + strlen("fake=");
return 0;
}
early_param("numa", early_numa);