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[PATCH] x86-64: fixed size remaining fake nodes

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Extends the numa=fake x86_64 command-line option to split the remaining system
memory into nodes of fixed size.  Any leftover memory is allocated to a final
node unless the command-line ends with a comma.

For example:
  numa=fake=2*512,*128	gives two 512M nodes and the remaining system
			memory is split into nodes of 128M each.

This is beneficial for systems where the exact size of RAM is unknown or not
necessarily relevant, but the size of the remaining nodes to be allocated is
known based on their capacity for resource management.

Cc: Andi Kleen <ak@suse.de>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Paul Jackson <pj@sgi.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Rientjes 2007-05-02 19:27:09 +02:00 committed by Andi Kleen
parent 14694d736b
commit 382591d500
2 changed files with 46 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/x86_64/boot-options.txt
View File

@ -153,11 +153,15 @@ NUMA
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
gives two 512M nodes, a 1024M node, and four 256M nodes. The
remaining system RAM is allocated to an additional node. If
the last character of CMDLINE is a *, the remaining system RAM
is instead divided up equally among its coefficient.
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=hotadd=percent
Only allow hotadd memory to preallocate page structures upto

47
arch/x86_64/mm/numa.c
View File

@ -361,6 +361,21 @@ static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr,
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(struct bootnode *nodes, 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++, nodes, addr, size, max_addr))
;
return i - node_start;
}
/*
* Sets up the system RAM area from start_pfn to end_pfn according to the
* numa=fake command-line option.
@ -370,9 +385,10 @@ static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
struct bootnode nodes[MAX_NUMNODES];
u64 addr = start_pfn << PAGE_SHIFT;
u64 max_addr = end_pfn << PAGE_SHIFT;
unsigned int coeff;
unsigned int num = 0;
int num_nodes = 0;
int coeff_flag;
int coeff = -1;
int num = 0;
u64 size;
int i;
@ -390,29 +406,34 @@ static int __init numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
}
/* Parse the command line. */
for (coeff = 1; ; cmdline++) {
for (coeff_flag = 0; ; cmdline++) {
if (*cmdline && isdigit(*cmdline)) {
num = num * 10 + *cmdline - '0';
continue;
}
if (*cmdline == '*')
coeff = num;
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) {
if (size)
for (i = 0; i < coeff; i++, num_nodes++)
if (setup_node_range(num_nodes, nodes,
&addr, size, max_addr) < 0)
goto done;
coeff = 1;
}
if (!*cmdline)
break;
coeff_flag = 0;
coeff = -1;
}
if (!*cmdline)
break;
num = 0;
}
done:
@ -420,6 +441,12 @@ done:
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(nodes, &addr, max_addr,
num_nodes, num);
goto out;
}
switch (*(cmdline - 1)) {
case '*':
/* Split remaining nodes into coeff chunks */