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irqbalance: add numa_node setting to polscript

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Often systems don't populate ACPI correctly, and inform the OS that a particular
device isn't local to any node (numa_node == -1).  This property in polscript
allows you to override that setting, so that numa nodes can be properly
specified based on documentation

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
This commit is contained in:
Neil Horman 2013-02-13 15:17:39 -05:00
parent 64f97948a7
commit c1af476ab1
2 changed files with 24 additions and 2 deletions
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16
classify.c
View file

@ -54,6 +54,8 @@ static short class_codes[MAX_CLASS] = {
struct user_irq_policy {
int ban;
int level;
int numa_node_set;
int numa_node;
};
static GList *interrupts_db;
@ -176,7 +178,10 @@ get_numa_node:
fclose(fd);
assign_node:
new->numa_node = get_numa_node(numa_node);
if (pol->numa_node_set)
new->numa_node = get_numa_node(pol->numa_node);
else
new->numa_node = get_numa_node(numa_node);
sprintf(path, "%s/local_cpus", devpath);
fd = fopen(path, "r");
@ -253,6 +258,15 @@ static void parse_user_policy_key(char *buf, struct user_irq_policy *pol)
log(TO_ALL, LOG_WARNING, "Bad value for balance_level policy: %s\n", value);
else
pol->level = idx;
} else if (!strcasecmp("numa_node", key)) {
idx = strtoul(value, NULL, 10);
if (!get_numa_node(idx)) {
log(TO_ALL, LOG_WARNING, "NUMA node %d doesn't exist\n",
idx);
return;
}
pol->numa_node = idx;
pol->numa_node_set = 1;
} else
log(TO_ALL, LOG_WARNING, "Unknown key returned, ignoring: %s\n", key);

10
irqbalance.1
View file

@ -108,7 +108,15 @@ Directs irqbalance to exclude the passed in irq from balancing
This allows a user to override the balance level of a given irq. By default the
balance level is determined automatically based on the pci device class of the
device that owns the irq.
.TP
.I numa_node=<integer>
This allows a user to override the numa node that sysfs indicates a given device
irq is local to. Often, systems will not specify this information in ACPI, and as a
result devicesa are considered equidistant from all numa nodes in a system.
This option allows for that hardware provided information to be overridden, so
that irqbalance can bias irq affinity for these devices toward its most local
node. Note that specifying a -1 here forces irqbalance to consider an interrupt
from a device to be equidistant from all nodes.
.TP
.B --pid=<file>
Have irqbalance write its process id to the specified file. By default no