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156 lines
5.0 KiB
156 lines
5.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* sched-domains (multiprocessor balancing) flag declarations. |
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*/ |
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#ifndef SD_FLAG |
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# error "Incorrect import of SD flags definitions" |
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#endif |
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/* |
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* Hierarchical metaflags |
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* |
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* SHARED_CHILD: These flags are meant to be set from the base domain upwards. |
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* If a domain has this flag set, all of its children should have it set. This |
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* is usually because the flag describes some shared resource (all CPUs in that |
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* domain share the same resource), or because they are tied to a scheduling |
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* behaviour that we want to disable at some point in the hierarchy for |
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* scalability reasons. |
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* |
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* In those cases it doesn't make sense to have the flag set for a domain but |
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* not have it in (some of) its children: sched domains ALWAYS span their child |
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* domains, so operations done with parent domains will cover CPUs in the lower |
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* child domains. |
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* |
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* |
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* SHARED_PARENT: These flags are meant to be set from the highest domain |
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* downwards. If a domain has this flag set, all of its parents should have it |
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* set. This is usually for topology properties that start to appear above a |
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* certain level (e.g. domain starts spanning CPUs outside of the base CPU's |
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* socket). |
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*/ |
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#define SDF_SHARED_CHILD 0x1 |
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#define SDF_SHARED_PARENT 0x2 |
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/* |
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* Behavioural metaflags |
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* |
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* NEEDS_GROUPS: These flags are only relevant if the domain they are set on has |
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* more than one group. This is usually for balancing flags (load balancing |
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* involves equalizing a metric between groups), or for flags describing some |
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* shared resource (which would be shared between groups). |
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*/ |
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#define SDF_NEEDS_GROUPS 0x4 |
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/* |
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* Balance when about to become idle |
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* |
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* SHARED_CHILD: Set from the base domain up to cpuset.sched_relax_domain_level. |
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* NEEDS_GROUPS: Load balancing flag. |
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*/ |
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SD_FLAG(SD_BALANCE_NEWIDLE, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Balance on exec |
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* |
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* SHARED_CHILD: Set from the base domain up to the NUMA reclaim level. |
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* NEEDS_GROUPS: Load balancing flag. |
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*/ |
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SD_FLAG(SD_BALANCE_EXEC, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Balance on fork, clone |
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* |
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* SHARED_CHILD: Set from the base domain up to the NUMA reclaim level. |
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* NEEDS_GROUPS: Load balancing flag. |
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*/ |
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SD_FLAG(SD_BALANCE_FORK, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Balance on wakeup |
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* |
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* SHARED_CHILD: Set from the base domain up to cpuset.sched_relax_domain_level. |
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* NEEDS_GROUPS: Load balancing flag. |
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*/ |
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SD_FLAG(SD_BALANCE_WAKE, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Consider waking task on waking CPU. |
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* |
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* SHARED_CHILD: Set from the base domain up to the NUMA reclaim level. |
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*/ |
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SD_FLAG(SD_WAKE_AFFINE, SDF_SHARED_CHILD) |
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/* |
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* Domain members have different CPU capacities |
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* |
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* SHARED_PARENT: Set from the topmost domain down to the first domain where |
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* asymmetry is detected. |
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* NEEDS_GROUPS: Per-CPU capacity is asymmetric between groups. |
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*/ |
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SD_FLAG(SD_ASYM_CPUCAPACITY, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS) |
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/* |
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* Domain members share CPU capacity (i.e. SMT) |
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* |
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* SHARED_CHILD: Set from the base domain up until spanned CPUs no longer share |
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* CPU capacity. |
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* NEEDS_GROUPS: Capacity is shared between groups. |
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*/ |
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SD_FLAG(SD_SHARE_CPUCAPACITY, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Domain members share CPU package resources (i.e. caches) |
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* |
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* SHARED_CHILD: Set from the base domain up until spanned CPUs no longer share |
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* the same cache(s). |
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* NEEDS_GROUPS: Caches are shared between groups. |
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*/ |
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SD_FLAG(SD_SHARE_PKG_RESOURCES, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Only a single load balancing instance |
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* |
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* SHARED_PARENT: Set for all NUMA levels above NODE. Could be set from a |
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* different level upwards, but it doesn't change that if a |
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* domain has this flag set, then all of its parents need to have |
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* it too (otherwise the serialization doesn't make sense). |
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* NEEDS_GROUPS: No point in preserving domain if it has a single group. |
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*/ |
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SD_FLAG(SD_SERIALIZE, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS) |
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/* |
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* Place busy tasks earlier in the domain |
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* |
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* SHARED_CHILD: Usually set on the SMT level. Technically could be set further |
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* up, but currently assumed to be set from the base domain |
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* upwards (see update_top_cache_domain()). |
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* NEEDS_GROUPS: Load balancing flag. |
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*/ |
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SD_FLAG(SD_ASYM_PACKING, SDF_SHARED_CHILD | SDF_NEEDS_GROUPS) |
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/* |
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* Prefer to place tasks in a sibling domain |
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* |
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* Set up until domains start spanning NUMA nodes. Close to being a SHARED_CHILD |
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* flag, but cleared below domains with SD_ASYM_CPUCAPACITY. |
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* |
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* NEEDS_GROUPS: Load balancing flag. |
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*/ |
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SD_FLAG(SD_PREFER_SIBLING, SDF_NEEDS_GROUPS) |
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/* |
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* sched_groups of this level overlap |
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* |
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* SHARED_PARENT: Set for all NUMA levels above NODE. |
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* NEEDS_GROUPS: Overlaps can only exist with more than one group. |
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*/ |
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SD_FLAG(SD_OVERLAP, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS) |
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/* |
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* Cross-node balancing |
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* |
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* SHARED_PARENT: Set for all NUMA levels above NODE. |
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* NEEDS_GROUPS: No point in preserving domain if it has a single group. |
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*/ |
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SD_FLAG(SD_NUMA, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS)
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