The patch titled
Subject: x86_64 NUMA emulation: add numa=fake parameter for custom nodes distance
has been added to the -mm tree. Its filename is
numa-emulation-x86_64-numa=fake-parameter-for-custom-nodes-distance.patch
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------------------------------------------------------
From: Petr Holasek <pholasek@xxxxxxxxxx>
Subject: x86_64 NUMA emulation: add numa=fake parameter for custom nodes distance
By default, when numa emulation is turned on, node distance table uses
physical distance, so for 4 nodes emulated on 1 physical table is
node 0 1 2 3
0: 10 10 10 10
1: 10 10 10 10
2: 10 10 10 10
3: 10 10 10 10
This patch adds new [distance] argument to
numa=fake=<number/size of nodes>[,distance]
When distance argument is used, it sets linear distance between nodes
like that:
__distance__
___|___ ____|___ ________ ________
| | | | | | | |
| node1 |---| node 2 |---| node 3 |---| node 4 |
|_______| |________| |________| |________|
| | |
| | |
|____distance * 2________| |
| |
|____________distance * 3______________|
This feature might be useful for testing some numa awareness features in
both user and kernel spaces.
Signed-off-by: Petr Holasek <pholasek@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/numa_emulation.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff -puN arch/x86/mm/numa_emulation.c~numa-emulation-x86_64-numa=fake-parameter-for-custom-nodes-distance arch/x86/mm/numa_emulation.c
--- a/arch/x86/mm/numa_emulation.c~numa-emulation-x86_64-numa=fake-parameter-for-custom-nodes-distance
+++ a/arch/x86/mm/numa_emulation.c
@@ -309,6 +309,8 @@ void __init numa_emulation(struct numa_m
u8 *phys_dist = NULL;
size_t phys_size = numa_dist_cnt * numa_dist_cnt * sizeof(phys_dist[0]);
int max_emu_nid, dfl_phys_nid;
+ unsigned long dist_level;
+ char *c;
int i, j, ret;
if (!emu_cmdline)
@@ -404,6 +406,17 @@ void __init numa_emulation(struct numa_m
if (emu_nid_to_phys[i] == NUMA_NO_NODE)
emu_nid_to_phys[i] = dfl_phys_nid;
+ /* load distance level parameter */
+ dist_level = -1;
+ c = strchr(emu_cmdline, ',');
+ if (c) {
+ c++;
+ ret = kstrtoul(c, 10, &dist_level);
+ if (ret < 0 || dist_level < LOCAL_DISTANCE ||
+ dist_level * max_emu_nid > ULONG_MAX)
+ dist_level = -1;
+ }
+
/* transform distance table */
numa_reset_distance();
for (i = 0; i < max_emu_nid + 1; i++) {
@@ -418,6 +431,9 @@ void __init numa_emulation(struct numa_m
else
dist = phys_dist[physi * numa_dist_cnt + physj];
+ if (dist_level != -1 && i != j)
+ dist = abs(i - j) * dist_level;
+
numa_set_distance(i, j, dist);
}
}
_
Subject: Subject: x86_64 NUMA emulation: add numa=fake parameter for custom nodes distance
Patches currently in -mm which might be from pholasek@xxxxxxxxxx are
numa-emulation-x86_64-numa=fake-parameter-for-custom-nodes-distance.patch
numa-emulation-x86_64-documentation-changes-in-boot-optionstxt.patch
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