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SubjectRe: [PATCH 0/5] Make Cluster Scheduling Configurable
On Fri, Dec 03, 2021 at 12:32:37PM -0800, Tim Chen wrote:
> Tim Chen (5):
> scheduler: Create SDTL_SKIP flag to skip topology level
> scheduler: Add SD_CLUSTER topology flag to cluster sched domain
> scheduler: Add runtime knob sysctl_sched_cluster
> scheduler: Add boot time enabling/disabling of cluster scheduling
> scheduler: Default cluster scheduling to off on x86 hybrid CPU

s/scheduler:/sched:/, surely?

> .../admin-guide/kernel-parameters.txt | 4 +
> arch/x86/kernel/smpboot.c | 26 +++++++
> drivers/base/arch_topology.c | 23 +++++-
> include/linux/sched/sd_flags.h | 7 ++
> include/linux/sched/sysctl.h | 6 ++
> include/linux/sched/topology.h | 3 +-
> include/linux/topology.h | 7 ++
> kernel/sched/core.c | 1 +
> kernel/sched/sched.h | 6 ++
> kernel/sched/topology.c | 75 ++++++++++++++++++-
> kernel/sysctl.c | 11 +++
> 11 files changed, 163 insertions(+), 6 deletions(-)

*groan*,... I was more thinking of something like so.

---
arch/x86/kernel/smpboot.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index ac2909f0cab3..617012f4619f 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -579,6 +579,17 @@ static struct sched_domain_topology_level x86_numa_in_package_topology[] = {
{ NULL, },
};

+static struct sched_domain_topology_level x86_hybrid_topology[] = {
+#ifdef CONFIG_SCHED_SMT
+ { cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },
+#endif
+#ifdef CONFIG_SCHED_MC
+ { cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) },
+#endif
+ { cpu_cpu_mask, SD_INIT_NAME(DIE) },
+ { NULL, },
+};
+
static struct sched_domain_topology_level x86_topology[] = {
#ifdef CONFIG_SCHED_SMT
{ cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },
@@ -1469,8 +1480,11 @@ void __init native_smp_cpus_done(unsigned int max_cpus)

calculate_max_logical_packages();

+ /* XXX for now assume numa-in-package and hybrid don't overlap */
if (x86_has_numa_in_package)
set_sched_topology(x86_numa_in_package_topology);
+ if (cpu_feature_enabled(X86_FEATURE_HYBRID_CPU))
+ set_sched_topology(x86_hybrid_topology);

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