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x86, numa: Remove configurable node size support for numa emulation 

Now that numa=fake=<size>[MG] is implemented, it is possible to remove
configurable node size support.  The command-line parsing was already
broken (numa=fake=*128, for example, would not work) and since fake nodes
are now interleaved over physical nodes, this support is no longer
required.

Signed-off-by: David Rientjes <rientjes@google.com>
LKML-Reference: <alpine.DEB.2.00.1002151343080.26927@chino.kir.corp.google.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
David Rientjes 2010-02-15 13:43:33 -08:00 committed by H. Peter Anvin
parent 8df5bb34de
commit ca2107c9d6
2 changed files with 17 additions and 161 deletions
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16
Documentation/x86/x86_64/boot-options.txt
View File

@ -170,19 +170,9 @@ NUMA
If given as a memory unit, fills all system RAM with nodes of
size interleaved over physical nodes.
numa=fake=CMDLINE
If a number, fakes CMDLINE nodes and ignores NUMA setup of the
actual machine. Otherwise, system memory is configured
depending on the sizes and coefficients listed. For example:
numa=fake=2*512,1024,4*256,*128
gives two 512M nodes, a 1024M node, four 256M nodes, and the
rest split into 128M chunks. If the last character of CMDLINE
is a *, the remaining memory is divided up equally among its
coefficient:
numa=fake=2*512,2*
gives two 512M nodes and the rest split into two nodes.
Otherwise, the remaining system RAM is allocated to an
additional node.
numa=fake=<N>
If given as an integer, fills all system RAM with N fake nodes
interleaved over physical nodes.
ACPI

162
arch/x86/mm/numa_64.c
View File

@ -597,73 +597,6 @@ static int __init split_nodes_size_interleave(u64 addr, u64 max_addr, u64 size)
return ret;
}
/*
* Splits num_nodes nodes up equally starting at node_start. The return value
* is the number of nodes split up and addr is adjusted to be at the end of the
* last node allocated.
*/
static int __init split_nodes_equally(u64 *addr, u64 max_addr, int node_start,
int num_nodes)
{
unsigned int big;
u64 size;
int i;
if (num_nodes <= 0)
return -1;
if (num_nodes > MAX_NUMNODES)
num_nodes = MAX_NUMNODES;
size = (max_addr - *addr - e820_hole_size(*addr, max_addr)) /
num_nodes;
/*
* Calculate the number of big nodes that can be allocated as a result
* of consolidating the leftovers.
*/
big = ((size & ~FAKE_NODE_MIN_HASH_MASK) * num_nodes) /
FAKE_NODE_MIN_SIZE;
/* Round down to nearest FAKE_NODE_MIN_SIZE. */
size &= FAKE_NODE_MIN_HASH_MASK;
if (!size) {
printk(KERN_ERR "Not enough memory for each node. "
"NUMA emulation disabled.\n");
return -1;
}
for (i = node_start; i < num_nodes + node_start; i++) {
u64 end = *addr + size;
if (i < big)
end += FAKE_NODE_MIN_SIZE;
/*
* The final node can have the remaining system RAM. Other
* nodes receive roughly the same amount of available pages.
*/
if (i == num_nodes + node_start - 1)
end = max_addr;
else
end = find_end_of_node(*addr, max_addr, size);
if (setup_node_range(i, addr, end - *addr, max_addr) < 0)
break;
}
return i - node_start + 1;
}
/*
* Splits the remaining system RAM into chunks of size. The remaining memory is
* always assigned to a final node and can be asymmetric. Returns the number of
* nodes split.
*/
static int __init split_nodes_by_size(u64 *addr, u64 max_addr, int node_start,
u64 size)
{
int i = node_start;
size = (size << 20) & FAKE_NODE_MIN_HASH_MASK;
while (!setup_node_range(i++, addr, size, max_addr))
;
return i - node_start;
}
/*
* Sets up the system RAM area from start_pfn to last_pfn according to the
* numa=fake command-line option.
@ -671,99 +604,32 @@ static int __init split_nodes_by_size(u64 *addr, u64 max_addr, int node_start,
static int __init numa_emulation(unsigned long start_pfn,
unsigned long last_pfn, int acpi, int k8)
{
u64 size, addr = start_pfn << PAGE_SHIFT;
u64 addr = start_pfn << PAGE_SHIFT;
u64 max_addr = last_pfn << PAGE_SHIFT;
int num_nodes = 0, num = 0, coeff_flag, coeff = -1, i;
int num_phys_nodes;
int num_nodes;
int i;
num_phys_nodes = setup_physnodes(addr, max_addr, acpi, k8);
/*
* If the numa=fake command-line contains a 'M' or 'G', it represents
* the fixed node size.
* the fixed node size. Otherwise, if it is just a single number N,
* split the system RAM into N fake nodes.
*/
if (strchr(cmdline, 'M') || strchr(cmdline, 'G')) {
u64 size;
size = memparse(cmdline, &cmdline);
num_nodes = split_nodes_size_interleave(addr, max_addr, size);
if (num_nodes < 0)
return num_nodes;
goto out;
} else {
unsigned long n;
n = simple_strtoul(cmdline, NULL, 0);
num_nodes = split_nodes_interleave(addr, max_addr, num_phys_nodes, n);
}
/*
* If the numa=fake command-line is just a single number N, split the
* system RAM into N fake nodes.
*/
if (!strchr(cmdline, '*') && !strchr(cmdline, ',')) {
long n = simple_strtol(cmdline, NULL, 0);
num_nodes = split_nodes_interleave(addr, max_addr,
num_phys_nodes, n);
if (num_nodes < 0)
return num_nodes;
goto out;
}
/* Parse the command line. */
for (coeff_flag = 0; ; cmdline++) {
if (*cmdline && isdigit(*cmdline)) {
num = num * 10 + *cmdline - '0';
continue;
}
if (*cmdline == '*') {
if (num > 0)
coeff = num;
coeff_flag = 1;
}
if (!*cmdline || *cmdline == ',') {
if (!coeff_flag)
coeff = 1;
/*
* Round down to the nearest FAKE_NODE_MIN_SIZE.
* Command-line coefficients are in megabytes.
*/
size = ((u64)num << 20) & FAKE_NODE_MIN_HASH_MASK;
if (size)
for (i = 0; i < coeff; i++, num_nodes++)
if (setup_node_range(num_nodes, &addr,
size, max_addr) < 0)
goto done;
if (!*cmdline)
break;
coeff_flag = 0;
coeff = -1;
}
num = 0;
}
done:
if (!num_nodes)
return -1;
/* Fill remainder of system RAM, if appropriate. */
if (addr < max_addr) {
if (coeff_flag && coeff < 0) {
/* Split remaining nodes into num-sized chunks */
num_nodes += split_nodes_by_size(&addr, max_addr,
num_nodes, num);
goto out;
}
switch (*(cmdline - 1)) {
case '*':
/* Split remaining nodes into coeff chunks */
if (coeff <= 0)
break;
num_nodes += split_nodes_equally(&addr, max_addr,
num_nodes, coeff);
break;
case ',':
/* Do not allocate remaining system RAM */
break;
default:
/* Give one final node */
setup_node_range(num_nodes, &addr, max_addr - addr,
max_addr);
num_nodes++;
}
}
out:
if (num_nodes < 0)
return num_nodes;
memnode_shift = compute_hash_shift(nodes, num_nodes, NULL);
if (memnode_shift < 0) {
memnode_shift = 0;