|
40 | 40 | #include <arch/abi.h> |
41 | 41 | #include <arch/sim_def.h> |
42 | 42 |
|
43 | | - |
44 | 43 | /* |
45 | 44 | * Use the (x86) "idle=poll" option to prefer low latency when leaving the |
46 | 45 | * idle loop over low power while in the idle loop, e.g. if we have |
47 | 46 | * one thread per core and we want to get threads out of futex waits fast. |
48 | 47 | */ |
49 | | -static int no_idle_nap; |
50 | 48 | static int __init idle_setup(char *str) |
51 | 49 | { |
52 | 50 | if (!str) |
53 | 51 | return -EINVAL; |
54 | 52 |
|
55 | 53 | if (!strcmp(str, "poll")) { |
56 | 54 | pr_info("using polling idle threads.\n"); |
57 | | - no_idle_nap = 1; |
58 | | - } else if (!strcmp(str, "halt")) |
59 | | - no_idle_nap = 0; |
60 | | - else |
61 | | - return -1; |
62 | | - |
63 | | - return 0; |
| 55 | + cpu_idle_poll_ctrl(true); |
| 56 | + return 0; |
| 57 | + } else if (!strcmp(str, "halt")) { |
| 58 | + return 0; |
| 59 | + } |
| 60 | + return -1; |
64 | 61 | } |
65 | 62 | early_param("idle", idle_setup); |
66 | 63 |
|
67 | | -/* |
68 | | - * The idle thread. There's no useful work to be |
69 | | - * done, so just try to conserve power and have a |
70 | | - * low exit latency (ie sit in a loop waiting for |
71 | | - * somebody to say that they'd like to reschedule) |
72 | | - */ |
73 | | -void cpu_idle(void) |
| 64 | +void arch_cpu_idle(void) |
74 | 65 | { |
75 | | - int cpu = smp_processor_id(); |
76 | | - |
77 | | - |
78 | | - current_thread_info()->status |= TS_POLLING; |
79 | | - |
80 | | - if (no_idle_nap) { |
81 | | - while (1) { |
82 | | - while (!need_resched()) |
83 | | - cpu_relax(); |
84 | | - schedule(); |
85 | | - } |
86 | | - } |
87 | | - |
88 | | - /* endless idle loop with no priority at all */ |
89 | | - while (1) { |
90 | | - tick_nohz_idle_enter(); |
91 | | - rcu_idle_enter(); |
92 | | - while (!need_resched()) { |
93 | | - if (cpu_is_offline(cpu)) |
94 | | - BUG(); /* no HOTPLUG_CPU */ |
95 | | - |
96 | | - local_irq_disable(); |
97 | | - __get_cpu_var(irq_stat).idle_timestamp = jiffies; |
98 | | - current_thread_info()->status &= ~TS_POLLING; |
99 | | - /* |
100 | | - * TS_POLLING-cleared state must be visible before we |
101 | | - * test NEED_RESCHED: |
102 | | - */ |
103 | | - smp_mb(); |
104 | | - |
105 | | - if (!need_resched()) |
106 | | - _cpu_idle(); |
107 | | - else |
108 | | - local_irq_enable(); |
109 | | - current_thread_info()->status |= TS_POLLING; |
110 | | - } |
111 | | - rcu_idle_exit(); |
112 | | - tick_nohz_idle_exit(); |
113 | | - schedule_preempt_disabled(); |
114 | | - } |
| 66 | + __get_cpu_var(irq_stat).idle_timestamp = jiffies; |
| 67 | + _cpu_idle(); |
115 | 68 | } |
116 | 69 |
|
117 | 70 | /* |
|
0 commit comments