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mirror-linux/kernel/sched
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Zqiang ccaeeb585c sched_ext: Use the resched_cpu() to replace resched_curr() in the bypass_lb_node() 
For the PREEMPT_RT kernels, the scx_bypass_lb_timerfn() running in the
preemptible per-CPU ktimer kthread context, this means that the following
scenarios will occur(for x86 platform):

       cpu1                          cpu2
				 ktimer kthread:
                                 ->scx_bypass_lb_timerfn
                                   ->bypass_lb_node
                                     ->for_each_cpu(cpu, resched_mask)

    migration/1:                       by preempt by migration/2:
    multi_cpu_stop()                     multi_cpu_stop()
    ->take_cpu_down()
      ->__cpu_disable()
	->set cpu1 offline

                                       ->rq1 = cpu_rq(cpu1)
                                       ->resched_curr(rq1)
                                         ->smp_send_reschedule(cpu1)
					   ->native_smp_send_reschedule(cpu1)
					     ->if(unlikely(cpu_is_offline(cpu))) {
                					WARN(1, "sched: Unexpected
							reschedule of offline CPU#%d!\n", cpu);
                					return;
        					}

This commit therefore use the resched_cpu() to replace resched_curr()
in the bypass_lb_node() to avoid send-ipi to offline CPUs.

Signed-off-by: Zqiang <qiang.zhang@linux.dev>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 		2025-12-22 17:51:51 -10:00
..
Makefile tracing: Disable branch profiling in noinstr code 2025-03-22 09:49:26 +01:00
autogroup.c cgroup: Rename cgroup lifecycle hooks to cgroup_task_*() 2025-11-03 11:46:18 -10:00
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: Clean up and standardize #if/#else/#endif markers in sched/clock.c 2025-06-13 08:47:14 +02:00
completion.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
core.c Miscellaneous scheduler fixes/cleanups: 2025-12-06 12:31:21 -08:00
core_sched.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpuacct.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpudeadline.c sched/deadline: only set free_cpus for online runqueues 2025-10-16 11:13:49 +02:00
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 sched: Clean up and standardize #if/#else/#endif markers in sched/cpufreq_schedutil.c 2025-06-13 08:47:15 +02:00
cpupri.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
cpupri.h sched/smp: Make SMP unconditional 2025-06-13 08:47:18 +02:00
cputime.c seqlock: Change thread_group_cputime() to use scoped_seqlock_read() 2025-10-21 12:31:57 +02:00
deadline.c cgroup: Changes for v6.19 2025-12-03 13:04:07 -08:00
debug.c sched/eevdf: Fix min_vruntime vs avg_vruntime 2025-11-11 12:33:38 +01:00
ext.c sched_ext: Use the resched_cpu() to replace resched_curr() in the bypass_lb_node() 2025-12-22 17:51:51 -10:00
ext.h sched_ext: Use cgroup_lock/unlock() to synchronize against cgroup operations 2025-09-03 11:36:07 -10:00
ext_idle.c sched_ext: Wrap kfunc args in struct to prepare for aux__prog 2025-10-13 08:49:29 -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: Implement load balancer for bypass mode 2025-11-12 06:43:44 -10:00
fair.c sched/fair: Fix unfairness caused by stalled tg_load_avg_contrib when the last task migrates out 2025-12-06 10:03:13 +01:00
features.h sched/fair: Proportional newidle balance 2025-11-17 17:13:16 +01:00
idle.c Power management updates for 6.19-rc1 2025-12-02 17:31:22 -08:00
isolation.c sched/isolation: Force housekeeping if isolcpus and nohz_full don't leave any 2025-11-20 20:17:31 +01:00
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 sched: Clean up and standardize #if/#else/#endif markers in sched/pelt.[ch] 2025-06-13 08:47:17 +02:00
pelt.h sched/fair: Switch to task based throttle model 2025-09-03 10:03:14 +02:00
psi.c sched/psi: Fix psi_seq initialization 2025-08-04 10:51:22 -07:00
rq-offsets.c sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
rt.c sched/proxy: Yield the donor task 2025-11-11 12:33:36 +01:00
sched-pelt.h sched: Make clangd usable 2025-06-11 11:20:53 +02:00
sched.h Miscellaneous scheduler fixes/cleanups: 2025-12-06 12:31:21 -08:00
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 sched/core: Fix psi_dequeue() for Proxy Execution 2025-12-06 10:13:16 +01:00
stop_task.c sched: Add support to pick functions to take rf 2025-10-16 11:13:55 +02:00
swait.c sched: Make clangd usable 2025-06-11 11:20:53 +02:00
syscalls.c Updates for the interrupt core and treewide cleanups: 2025-12-02 09:14:26 -08:00
topology.c sched/fair: Proportional newidle balance 2025-11-17 17:13:16 +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