函数源码 |
Source File:kernel\sched\core.c |
Create Date:2022-07-27 10:36:22 |
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2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 | #ifdef CONFIG_NUMA_BALANCINGvoid set_numabalancing_state(bool enabled){ if (enabled) static_branch_enable(&sched_numa_balancing); else static_branch_disable(&sched_numa_balancing);}#ifdef CONFIG_PROC_SYSCTLint sysctl_numa_balancing(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos){ struct ctl_table t; int err; int state = static_branch_likely(&sched_numa_balancing); if (write && !capable(CAP_SYS_ADMIN)) return -EPERM; t = *table; t.data = &state; err = proc_dointvec_minmax(&t, write, buffer, lenp, ppos); if (err < 0) return err; if (write) set_numabalancing_state(state); return err;}#endif#endif#ifdef CONFIG_SCHEDSTATSDEFINE_STATIC_KEY_FALSE(sched_schedstats);static bool __initdata __sched_schedstats = false;static void set_schedstats(bool enabled){ if (enabled) static_branch_enable(&sched_schedstats); else static_branch_disable(&sched_schedstats);}void force_schedstat_enabled(void){ if (!schedstat_enabled()) { pr_info("kernel profiling enabled schedstats, disable via kernel.sched_schedstats.\n"); static_branch_enable(&sched_schedstats); }}static int __init setup_schedstats(char *str){ int ret = 0; if (!str) goto out; /* * This code is called before jump labels have been set up, so we can't * change the static branch directly just yet. Instead set a temporary * variable so init_schedstats() can do it later. */ if (!strcmp(str, "enable")) { __sched_schedstats = true; ret = 1; } else if (!strcmp(str, "disable")) { __sched_schedstats = false; ret = 1; }out: if (!ret) pr_warn("Unable to parse schedstats=\n"); return ret;}__setup("schedstats=", setup_schedstats);static void __init init_schedstats(void){ set_schedstats(__sched_schedstats);}#ifdef CONFIG_PROC_SYSCTLint sysctl_schedstats(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos){ struct ctl_table t; int err; int state = static_branch_likely(&sched_schedstats); if (write && !capable(CAP_SYS_ADMIN)) return -EPERM; t = *table; t.data = &state; err = proc_dointvec_minmax(&t, write, buffer, lenp, ppos); if (err < 0) return err; if (write) set_schedstats(state); return err;}#endif /* CONFIG_PROC_SYSCTL */#else /* !CONFIG_SCHEDSTATS */static inline void init_schedstats(void) {} |