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Topology-Aware scheduling based on sched domains #1

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Topology-Aware scheduling based on sched domains #1

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c2d4294
sched/topo: Add helper to get node and node distance for llc
jongwu Mar 23, 2026
f3c4ade
sched/topo: Add a easy way to get sched domain for NODE
jongwu Mar 23, 2026
2b61ffd
sched/fair: select preferred llc inside preferred NUMA
jongwu Mar 23, 2026
1239530
sched/fair: decide if migrate for a generic node
jongwu Mar 23, 2026
720c3b4
sched/fair: Add rq affinity boost calculation algorithm
jongwu Mar 30, 2026
42a2831
sched/fair: consider affinity improvement when find src group/rq
jongwu Apr 1, 2026
36388d9
sched/fair: remove the sibling bound for llc_balance
jongwu Apr 1, 2026
af78982
sched/fair: determine migration based on affinity improvement
jongwu Mar 24, 2026
7a43f18
sched: make sched cache override numa balancing
jongwu Mar 24, 2026
a694898
sched/fair: dynamicly scale the period of cache work
jongwu Mar 25, 2026
e83bd8f
sched/fair: Introduce secondary best task mechanism
jongwu Mar 25, 2026
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4 changes: 4 additions & 0 deletions include/linux/sched.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2347,7 +2347,11 @@ struct sched_cache_stat {
struct sched_cache_time __percpu *pcpu_time;
raw_spinlock_t lock;
unsigned long epoch;
unsigned long last_reset_tick;
unsigned long next_scan;
unsigned long scan_period;
u64 nr_running_avg;
int need_scan;
int cpu;
} ____cacheline_aligned_in_smp;

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4 changes: 4 additions & 0 deletions include/linux/topology.h
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Original file line number Diff line number Diff line change
Expand Up @@ -265,6 +265,10 @@ static inline const struct cpumask *cpu_node_mask(int cpu)
return cpumask_of_node(cpu_to_node(cpu));
}

#define NR_LLCS NR_CPUS
int llc_to_node(int llc);
int llc_distance(int llc0, int llc1);

#ifdef CONFIG_NUMA
int sched_numa_find_nth_cpu(const struct cpumask *cpus, int cpu, int node);
extern const struct cpumask *sched_numa_hop_mask(unsigned int node, unsigned int hops);
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8 changes: 8 additions & 0 deletions kernel/sched/debug.c
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Expand Up @@ -566,6 +566,14 @@ static __init int sched_init_debug(void)
#ifdef CONFIG_SCHED_CACHE
debugfs_create_file("llc_enabled", 0644, debugfs_sched, NULL,
&sched_cache_enable_fops);
debugfs_create_u32("llc_override_numa_balance", 0644, debugfs_sched,
&llc_override_numa_balance);
debugfs_create_u32("llc_scan_period_max", 0644, debugfs_sched,
&llc_scan_period_max);
debugfs_create_u32("llc_scan_period_min", 0644, debugfs_sched,
&llc_scan_period_min);
debugfs_create_u32("llc_scan_period_threshold", 0644, debugfs_sched,
&llc_scan_period_threshold);
debugfs_create_u32("llc_aggr_tolerance", 0644, debugfs_sched,
&llc_aggr_tolerance);
debugfs_create_u32("llc_epoch_period", 0644, debugfs_sched,
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