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mirror-linux/kernel/sched
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Andrea Righi 2197cecdb0 sched_ext: idle: Prioritize idle SMT sibling 
In the default built-in idle CPU selection policy, when @prev_cpu is
busy and no fully idle core is available, try to place the task on its
SMT sibling if that sibling is idle, before searching any other idle CPU
in the same LLC.

Migration to the sibling is cheap and keeps the task on the same core,
preserving L1 cache and reducing wakeup latency.

On large SMT systems this appears to consistently boost throughput by
roughly 2-3% on CPU-bound workloads (running a number of tasks equal to
the number of SMT cores).

Cc: Cheng-Yang Chou <yphbchou0911@gmail.com>
Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 		2026-03-21 08:31:16 -10:00
..
Makefile sched: Enable context analysis for core.c and fair.c 2026-01-05 16:43:36 +01:00
autogroup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
autogroup.h sched: Clean up and standardize #if/#else/#endif markers in sched/autogroup.[ch] 2025-06-13 08:47:14 +02:00
build_policy.c sched_ext: Move internal type and accessor definitions to ext_internal.h 2025-09-03 11:33:28 -10:00
build_utility.c sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
clock.c sched/clock: Avoid false sharing for sched_clock_irqtime 2026-02-03 12:04:19 +01:00
completion.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
core.c Merge branch 'sched/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-7.1 2026-03-09 09:59:36 -10:00
core_sched.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpuacct.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpudeadline.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpudeadline.h sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
cpufreq.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpufreq_schedutil.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpupri.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpupri.h sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
cputime.c - A nice cleanup to the paravirt code containing a unification of the paravirt 2026-02-10 19:01:45 -08:00
deadline.c sched/deadline: Add reporting of runtime left & abs deadline to sched_getattr() for DEADLINE tasks 2026-02-25 15:35:58 +01:00
debug.c sched/fair: Increase weight bits for avg_vruntime 2026-02-23 18:04:10 +01:00
ext.c sched_ext: Fix typos in comments 2026-03-17 07:46:36 -10:00
ext.h sched_ext: Add @kargs to scx_fork() 2026-03-06 07:58:02 -10:00
ext_idle.c sched_ext: idle: Prioritize idle SMT sibling 2026-03-21 08:31:16 -10:00
ext_idle.h sched_ext: Always use SMP versions in kernel/sched/ext_idle.h 2025-06-13 14:47:59 -10:00
ext_internal.h sched_ext: Add SCX_OPS_ALWAYS_ENQ_IMMED ops flag 2026-03-13 09:43:23 -10:00
fair.c sched/fair: Skip SCHED_IDLE rq for SCHED_IDLE task 2026-02-23 18:04:12 +01:00
features.h sched/fair: Increase weight bits for avg_vruntime 2026-02-23 18:04:10 +01:00
idle.c sched_ext: Add a DL server for sched_ext tasks 2026-02-03 12:04:17 +01:00
isolation.c cgroup/cpuset: Call housekeeping_update() without holding cpus_read_lock 2026-02-23 10:46:49 -10:00
loadavg.c Merge branch 'tip/sched/urgent' 2025-07-14 17:16:28 +02:00
membarrier.c rseq: Simplify the event notification 2025-11-04 08:30:09 +01:00
pelt.c treewide: Update email address 2026-01-11 06:09:11 -10:00
pelt.h sched/fair: Switch to task based throttle model 2025-09-03 10:03:14 +02:00
psi.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
rq-offsets.c sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
rt.c sched: Fix incorrect schedstats for rt and dl thread 2026-02-23 18:04:11 +01:00
sched-pelt.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
sched.h sched_ext: Implement SCX_ENQ_IMMED 2026-03-13 09:43:22 -10:00
smp.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
stats.c sched/smp: Use the SMP version of schedstats 2025-06-13 08:47:21 +02:00
stats.h delayacct: add timestamp of delay max 2026-01-31 16:16:06 -08:00
stop_task.c sched/core: Rework sched_class::wakeup_preempt() and rq_modified_*() 2025-12-17 10:53:25 +01:00
swait.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
syscalls.c sched/deadline: Add reporting of runtime left & abs deadline to sched_getattr() for DEADLINE tasks 2026-02-25 15:35:58 +01:00
topology.c sched/fair: More complex proportional newidle balance 2026-02-23 18:04:09 +01:00
wait.c ARM: 2025-07-30 17:14:01 -07:00
wait_bit.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00