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sched/balancing: Rename run_rebalance_domains() => sched_balance_softirq()

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run_rebalance_domains() is a misnomer, as it doesn't only
run rebalance_domains(), but since the introduction of the
NOHZ code it also runs nohz_idle_balance().

Rename it to sched_balance_softirq(), reflecting its more
generic purpose and that it's a softirq handler.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://lore.kernel.org/r/20240308111819.1101550-2-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2024-03-08 12:18:07 +01:00
parent 33928ed8bd
commit 70a27d6d1b
3 changed files with 4 additions and 4 deletions
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2
Documentation/scheduler/sched-domains.rst
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@ -34,7 +34,7 @@ out of balance are tasks moved between groups.
In kernel/sched/core.c, trigger_load_balance() is run periodically on each CPU
through scheduler_tick(). It raises a softirq after the next regularly scheduled
rebalancing event for the current runqueue has arrived. The actual load
balancing workhorse, run_rebalance_domains()->rebalance_domains(), is then run
balancing workhorse, sched_balance_softirq()->rebalance_domains(), is then run
in softirq context (SCHED_SOFTIRQ).
The latter function takes two arguments: the runqueue of current CPU and whether

2
Documentation/translations/zh_CN/scheduler/sched-domains.rst
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@ -36,7 +36,7 @@ CPU共享。任意两个组的CPU掩码的交集不一定为空，如果是这
在kernel/sched/core.c中，trigger_load_balance()在每个CPU上通过scheduler_tick()
周期执行。在当前运行队列下一个定期调度再平衡事件到达后，它引发一个软中断。负载均衡真正
的工作由run_rebalance_domains()->rebalance_domains()完成，在软中断上下文中执行
的工作由sched_balance_softirq()->rebalance_domains()完成，在软中断上下文中执行
（SCHED_SOFTIRQ）。
后一个函数有两个入参：当前CPU的运行队列、它在scheduler_tick()调用时是否空闲。函数会从

4
kernel/sched/fair.c
View File

@ -12415,7 +12415,7 @@ out:
* - indirectly from a remote scheduler_tick() for NOHZ idle balancing
* through the SMP cross-call nohz_csd_func()
*/
static __latent_entropy void run_rebalance_domains(struct softirq_action *h)
static __latent_entropy void sched_balance_softirq(struct softirq_action *h)
{
struct rq *this_rq = this_rq();
enum cpu_idle_type idle = this_rq->idle_balance;
@ -13216,7 +13216,7 @@ __init void init_sched_fair_class(void)
#endif
}
open_softirq(SCHED_SOFTIRQ, run_rebalance_domains);
open_softirq(SCHED_SOFTIRQ, sched_balance_softirq);
#ifdef CONFIG_NO_HZ_COMMON
nohz.next_balance = jiffies;