In short, settingsched_rt_runtime_usto-1can beextremely dangerous. A value of-1means no limit. In other words, a "run-away" real-time task will be permitted to monopolise a CPU which could (potentially) lock up a system. The default value forsched_rt_runtime_usis950000or0.95seconds....
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When using cgroup rt_bandwidth with RT_RUNTIME_SHARE, if there are cpu hotplug and cpu.rt_runtime_us changing concurrently, the warning in __disable_runtime may occur: [ 991.697692] WARNING: CPU: 0 PID: 49573 at kernel/sched/rt.c:802 rq_offline_rt+0x24d/0x260 [ 991.697795] CPU: ...
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sched_rt_runtime_us:950000 sched_schedstats:0 sched_time_avg_ms:1000 sched_tunable_scaling:1 sched_wakeup_granularity_ns:3000000 grep: seccomp: Is a directory sem:32000 1024000000 500 32000 sem_next_id:-1 shmall:18446744073692774399 shmmax:18446744073692774399 shmmni:4096 shm_next_id:-1 shm_rmi...
1,取得目前的CPU ID,與目前CPU的 RunQueue指標,與目前RunQueue中正在執行的Curr Task指標 2,呼叫 sched_clock_tick (實作在kernel/sched_clock.c中),這函式需在有設定Unstable CPU Clock時才有作用,如果全域變數sched_clock_stable為1,這個函式就會不作用直接返回.(ARM環境中,這個變數並無作用.) ...
#define RUNTIME_INF ((u64)~0ULL) static inline int idle_policy(int policy) { return policy == SCHED_IDLE; } static inline int fair_policy(int policy) { return policy == SCHED_NORMAL || policy == SCHED_BATCH; } static inline int rt_policy(int policy) { return pol...
- spi: stm32: fixes pm_runtime calls in probe/remove - spi: imx: add a check for speed_hz before calculating the clock - ASoC: wm_adsp: Correct wm_coeff_tlv_get handling - perf sched: Fix record failure when CONFIG_SCHEDSTATS is not set ...
通过/proc/sys/kernel/sched_rt_period_us和/proc/sys/kernel/sched_rt_runtime_us这两个接口文件来设置实时进程所占的时间片比例上限。具体到实现中,rt.c的全局变量:struct rt_bandwidth def_rt_bandwidth就用于实现这个带宽控制功能。 但是,当我们需要更细粒度的对实时进程进行分组控制时,需要用到CGROUP。 而ta...
Scheduling initialization is located relatively late in start_kernel. At this time, memory initialization has been completed, so you can see that memory application functions such as kzmalloc can already be called in sched_init. sched_init needs to initialize the run queue (rq) for each CPU, ...