[S390] cpu topology: introduce kernel parameter
Introduce a topology=[on|off] kernel parameter which allows to switch cpu topology on/off. Default will be off, since it looks like that for some workloards this doesn't behave very well (on s390). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -2252,6 +2252,14 @@ and is between 256 and 4096 characters. It is defined in the file
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See comment before function dc390_setup() in
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drivers/scsi/tmscsim.c.
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topology= [S390]
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Format: {off | on}
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Specify if the kernel should make use of the cpu
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topology informations if the hardware supports these.
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The scheduler will make use of these informations and
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e.g. base its process migration decisions on it.
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Default is off.
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tp720= [HW,PS2]
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trix= [HW,OSS] MediaTrix AudioTrix Pro
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@ -58,6 +58,7 @@ struct core_info {
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cpumask_t mask;
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};
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static int topology_enabled;
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static void topology_work_fn(struct work_struct *work);
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static struct tl_info *tl_info;
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static struct core_info core_info;
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@ -78,7 +79,7 @@ cpumask_t cpu_coregroup_map(unsigned int cpu)
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cpumask_t mask;
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cpus_clear(mask);
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if (!machine_has_topology)
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if (!topology_enabled || !machine_has_topology)
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return cpu_possible_map;
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spin_lock_irqsave(&topology_lock, flags);
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while (core) {
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@ -263,6 +264,15 @@ static void topology_interrupt(__u16 code)
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schedule_work(&topology_work);
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}
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static int __init early_parse_topology(char *p)
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{
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if (strncmp(p, "on", 2))
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return 0;
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topology_enabled = 1;
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return 0;
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}
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early_param("topology", early_parse_topology);
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static int __init init_topology_update(void)
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{
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int rc;
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