Linux preempt_count抢占计数与PREEMPT_NONE模式

Linux preempt_count抢占计数与PREEMPT_NONE模式preempt_count是task_struct中thread_info的一个32位字段在CONFIG_PREEMPT_COUNTy时编译。该字段被划分为四个子域preemption disable count低8位、softirq count8-15位、hardirq count16-23位、NMI count24-31位。在内核抢占模型中只要preempt_count不为零或没有设置TIF_NEED_RESCHEDschedule()不会在该点发生。c/* include/linux/preempt.h */#define PREEMPT_DISABLE_OFFSET 1UL#define SOFTIRQ_DISABLE_OFFSET (1UL 8)#define HARDIRQ_DISABLE_OFFSET (1UL 16)#define NMI_OFFSET (1UL 24)struct thread_info {unsigned long flags;u32 status;int preempt_count; /* 仅在CONFIG_PREEMPT_COUNTy时有效 */};static __always_inline int preempt_count(void){return READ_ONCE(current_thread_info()-preempt_count);}static __always_inline void preempt_disable(void){current_thread_info()-preempt_count;barrier();}static __always_inline void preempt_enable(void){barrier();if (unlikely(preempt_count_dec_and_test())) {__preempt_schedule();}}PREEMPT_NONE模式是Linux内核默认的抢占模型此时CONFIG_PREEMPT_NONEy且CONFIG_PREEMPT_COUNTn或为y但preempt_enable不触发resched。该模式下内核态代码完全不允许抢占——即preempt_disable/preempt_enable在编译时退化为空操作preempt_count字段只保留在thread_info中供lockdep使用。用户态抢占不受影响return_to_user时检查TIF_NEED_RESCHED仍然生效。c#ifdef CONFIG_PREEMPT_NONE#define preempt_disable_notrace() barrier()#define preempt_enable_notrace() barrier()#define preempt_check_resched() do { } while (0)#endif#ifdef CONFIG_PREEMPT_VOLUNTARY#define preempt_enable_notrace() do { \barrier(); \if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \__cond_resched(); \} while (0)#endif#ifdef CONFIG_PREEMPT#define preempt_enable_notrace() do { \barrier(); \if (unlikely(preempt_count_dec_and_test())) \__preempt_schedule(); \} while (0)#endifPREEMPT_NONE模式下内核态阻塞的唯一路径是cond_resched()显式调用的检查点。cond_resched()会检查preempt_count是否为0且TIF_NEED_RESCHED被设置然后调用__schedule()。内核代码中散布了数百个cond_resched()调用点主要分布在长循环、文件系统遍历、内存压缩等路径中。如果某个耗时操作缺少cond_resched()在PREEMPT_NONE上会导致调度延迟无限增大——典型的case是zswap的压缩循环和direct reclaim的pagewalk。cint __sched cond_resched(void){if (should_resched(0)) {preempt_schedule_common();return 1;}return 0;}static inline bool should_resched(int preempt_offset){return unlikely(preempt_count() preempt_offset test_thread_flag(TIF_NEED_RESCHED));}preempt_count的原子更新通过arch-specific的set_preempt_need_resched和clear_preempt_need_resched实现。x86_64使用的add_smp和sub_smp指令保证preempt_count增减的可见性。但softirq路径中对preempt_count的操作是问题高发区local_bh_disable()在增加SOFTIRQ_DISABLE_OFFSET的同时还增加了PREEMPT_DISABLE_OFFSET导致在softirq期间不仅禁止bottom half也被禁止了内核抢占。__local_bh_enable_ip()中的preempt_count子域递减必须按精确顺序进行以避免中间态被NMI中断观测到异常值。cstatic __always_inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt){preempt_count_add(cnt SOFTIRQ_DISABLE_OFFSET);barrier();}void __local_bh_enable_ip(unsigned long ip, unsigned int cnt){WARN_ON_ONCE(in_irq());/* 锁破坏检测检查是否有spinlock仍然在softirq上下文中持有 */lockdep_assert_irqs_enabled();preempt_count_sub(cnt SOFTIRQ_DISABLE_OFFSET);barrier();if (unlikely(!in_interrupt() local_softirq_pending()))do_softirq();}硬中断入口irq_enter()递增hardirq countHARDIRQ_OFFSET同时隐含地禁用了内核抢占——preempt_count非零导致任何preempt_enable都不会触发调度。irq_exit()递减HARDIRQ_OFFSET后检查是否有pending softirq需要处理。但这里有一个延迟敏感场景irq_exit到preempt_enable之间的window中若softirq触发了wakeup不会立即导致调度——因为preempt_count尚未降到零。NMI的处理类似但更严格nmi_enter()在preempt_count上增加NMI_OFFSET且NMI_OFFSET是32位字段的最高8位与HARDIRQ_OFFSET不重叠。这样嵌套的NMI可以安全地递增而不干扰硬中断计数。但bug在于nmi_nesting_depth超过255时NMI_OFFSET会溢出到HARDIRQ位——极端罕见但已在trace_nmi_enter中通过per-cpu的__nmi_count做冗余检查。preempt_count在schedule()内的行为也值得一提。__schedule()入口调用preempt_disable_notrace()这确保了schedule()过程中不会被更高优先级的任务抢占。这防止了调度器递归进入自身。而schedule()退出时通过finish_task_switch()检查need_resched()如果新的当前任务也有TIF_NEED_RESCHED标志则立即重新调用__schedule()而不返回。cstatic void __sched notrace __schedule(unsigned int sched_mode){struct task_struct *prev, *next;struct rq *rq;int cpu;/* preempt_disable防止调度递归 */cpu smp_processor_id();rq cpu_rq(cpu);prev rq-curr;if (sched_mode SM_MASK_PREEMPT) {/* 抢占调度——处理PREEMPT_ACTIVE标志 */schedule_debug(prev);}rcu_note_context_switch(preempt);/* 实际的context switch */next pick_next_task(rq, prev, rf);clear_tsk_need_resched(prev);clear_preempt_need_resched();if (likely(prev ! next)) {rq-curr next;context_switch(rq, prev, next, rf);} else {raw_spin_unlock_irq(rq-lock);}}PREEMPT_NONE模型下的一个非直观行为preempt_disable()即使被编译为barrier()仍然需要处理lockdep的跟踪。lockdep在每次spin_lock时检查当前preempt_count是否包含hardirq或softirq位如果不匹配就报inconsistent lock state。因此即使PREEMPT_NONE不产生实际抢占效果preempt_count的thread_info字段仍需维护。m.dgb.mfqqpa.cn/55995.Docm.dgb.mfqqpa.cn/35353.Docm.dgb.mfqqpa.cn/93555.Docm.dgb.mfqqpa.cn/39575.Docm.dgb.mfqqpa.cn/19397.Docm.dgb.mfqqpa.cn/15957.Docm.dgb.mfqqpa.cn/97395.Docm.dgb.mfqqpa.cn/19531.Docm.dgb.mfqqpa.cn/79731.Docm.dgb.mfqqpa.cn/31313.Docm.dgv.mfqqpa.cn/17915.Docm.dgv.mfqqpa.cn/71991.Docm.dgv.mfqqpa.cn/11535.Docm.dgv.mfqqpa.cn/77939.Docm.dgv.mfqqpa.cn/97355.Docm.dgv.mfqqpa.cn/97751.Docm.dgv.mfqqpa.cn/71997.Docm.dgv.mfqqpa.cn/57577.Docm.dgv.mfqqpa.cn/55111.Docm.dgv.mfqqpa.cn/57791.Docm.dgc.mfqqpa.cn/91557.Docm.dgc.mfqqpa.cn/33713.Docm.dgc.mfqqpa.cn/99339.Docm.dgc.mfqqpa.cn/31731.Docm.dgc.mfqqpa.cn/75919.Docm.dgc.mfqqpa.cn/73991.Docm.dgc.mfqqpa.cn/91799.Docm.dgc.mfqqpa.cn/31537.Docm.dgc.mfqqpa.cn/17355.Docm.dgc.mfqqpa.cn/31535.Docm.dgx.mfqqpa.cn/53997.Docm.dgx.mfqqpa.cn/13179.Docm.dgx.mfqqpa.cn/55991.Docm.dgx.mfqqpa.cn/37775.Docm.dgx.mfqqpa.cn/51155.Docm.dgx.mfqqpa.cn/37955.Docm.dgx.mfqqpa.cn/33519.Docm.dgx.mfqqpa.cn/77557.Docm.dgx.mfqqpa.cn/15773.Docm.dgx.mfqqpa.cn/17793.Docm.dgz.mfqqpa.cn/55977.Docm.dgz.mfqqpa.cn/31595.Docm.dgz.mfqqpa.cn/91195.Docm.dgz.mfqqpa.cn/75799.Docm.dgz.mfqqpa.cn/37531.Docm.dgz.mfqqpa.cn/35513.Docm.dgz.mfqqpa.cn/19395.Docm.dgz.mfqqpa.cn/99597.Docm.dgz.mfqqpa.cn/79311.Docm.dgz.mfqqpa.cn/95957.Docm.dgl.mfqqpa.cn/31115.Docm.dgl.mfqqpa.cn/31511.Docm.dgl.mfqqpa.cn/53193.Docm.dgl.mfqqpa.cn/53959.Docm.dgl.mfqqpa.cn/15373.Docm.dgl.mfqqpa.cn/39715.Docm.dgl.mfqqpa.cn/55555.Docm.dgl.mfqqpa.cn/31317.Docm.dgl.mfqqpa.cn/17799.Docm.dgl.mfqqpa.cn/53917.Docm.dgk.mfqqpa.cn/79519.Docm.dgk.mfqqpa.cn/77517.Docm.dgk.mfqqpa.cn/35151.Docm.dgk.mfqqpa.cn/13355.Docm.dgk.mfqqpa.cn/17353.Docm.dgk.mfqqpa.cn/17777.Docm.dgk.mfqqpa.cn/95395.Docm.dgk.mfqqpa.cn/39535.Docm.dgk.mfqqpa.cn/73551.Docm.dgk.mfqqpa.cn/15717.Docm.dgj.mfqqpa.cn/17935.Docm.dgj.mfqqpa.cn/39713.Docm.dgj.mfqqpa.cn/35731.Docm.dgj.mfqqpa.cn/73191.Docm.dgj.mfqqpa.cn/39159.Docm.dgj.mfqqpa.cn/71395.Docm.dgj.mfqqpa.cn/39597.Docm.dgj.mfqqpa.cn/51357.Docm.dgj.mfqqpa.cn/35757.Docm.dgj.mfqqpa.cn/73513.Docm.dgh.mfqqpa.cn/53957.Docm.dgh.mfqqpa.cn/11911.Docm.dgh.mfqqpa.cn/11311.Docm.dgh.mfqqpa.cn/33375.Docm.dgh.mfqqpa.cn/59931.Docm.dgh.mfqqpa.cn/31795.Docm.dgh.mfqqpa.cn/97795.Docm.dgh.mfqqpa.cn/35933.Docm.dgh.mfqqpa.cn/99773.Docm.dgh.mfqqpa.cn/51991.Docm.dgg.mfqqpa.cn/59319.Docm.dgg.mfqqpa.cn/11333.Docm.dgg.mfqqpa.cn/77793.Docm.dgg.mfqqpa.cn/99519.Docm.dgg.mfqqpa.cn/99711.Docm.dgg.mfqqpa.cn/53773.Docm.dgg.mfqqpa.cn/57139.Docm.dgg.mfqqpa.cn/93557.Docm.dgg.mfqqpa.cn/95313.Docm.dgg.mfqqpa.cn/53597.Docm.dgf.mfqqpa.cn/57799.Docm.dgf.mfqqpa.cn/51537.Docm.dgf.mfqqpa.cn/55977.Docm.dgf.mfqqpa.cn/57551.Docm.dgf.mfqqpa.cn/17139.Docm.dgf.mfqqpa.cn/39117.Docm.dgf.mfqqpa.cn/59317.Docm.dgf.mfqqpa.cn/93339.Docm.dgf.mfqqpa.cn/95757.Docm.dgf.mfqqpa.cn/33335.Docm.dgd.mfqqpa.cn/53733.Docm.dgd.mfqqpa.cn/51117.Docm.dgd.mfqqpa.cn/55997.Docm.dgd.mfqqpa.cn/13371.Docm.dgd.mfqqpa.cn/17539.Docm.dgd.mfqqpa.cn/91133.Docm.dgd.mfqqpa.cn/95915.Docm.dgd.mfqqpa.cn/35971.Docm.dgd.mfqqpa.cn/91559.Docm.dgd.mfqqpa.cn/17179.Docm.dgs.mfqqpa.cn/95119.Docm.dgs.mfqqpa.cn/97153.Docm.dgs.mfqqpa.cn/91577.Docm.dgs.mfqqpa.cn/13111.Docm.dgs.mfqqpa.cn/37197.Docm.dgs.mfqqpa.cn/79371.Docm.dgs.mfqqpa.cn/11759.Docm.dgs.mfqqpa.cn/59159.Docm.dgs.mfqqpa.cn/73393.Docm.dgs.mfqqpa.cn/91193.Docm.dga.mfqqpa.cn/71513.Docm.dga.mfqqpa.cn/33733.Docm.dga.mfqqpa.cn/73377.Docm.dga.mfqqpa.cn/71751.Docm.dga.mfqqpa.cn/53571.Docm.dga.mfqqpa.cn/33799.Docm.dga.mfqqpa.cn/11559.Docm.dga.mfqqpa.cn/59597.Docm.dga.mfqqpa.cn/19975.Docm.dga.mfqqpa.cn/71753.Docm.dgp.mfqqpa.cn/75171.Docm.dgp.mfqqpa.cn/79793.Docm.dgp.mfqqpa.cn/39113.Docm.dgp.mfqqpa.cn/31771.Docm.dgp.mfqqpa.cn/93173.Docm.dgp.mfqqpa.cn/59975.Docm.dgp.mfqqpa.cn/79795.Docm.dgp.mfqqpa.cn/71571.Docm.dgp.mfqqpa.cn/55191.Docm.dgp.mfqqpa.cn/51713.Docm.dgo.mfqqpa.cn/93771.Docm.dgo.mfqqpa.cn/95793.Docm.dgo.mfqqpa.cn/53595.Docm.dgo.mfqqpa.cn/35593.Docm.dgo.mfqqpa.cn/59535.Docm.dgo.mfqqpa.cn/13177.Docm.dgo.mfqqpa.cn/75951.Docm.dgo.mfqqpa.cn/31937.Docm.dgo.mfqqpa.cn/77773.Docm.dgo.mfqqpa.cn/19777.Docm.dgi.mfqqpa.cn/97119.Docm.dgi.mfqqpa.cn/99511.Docm.dgi.mfqqpa.cn/33375.Docm.dgi.mfqqpa.cn/37915.Docm.dgi.mfqqpa.cn/33993.Docm.dgi.mfqqpa.cn/93597.Docm.dgi.mfqqpa.cn/17917.Docm.dgi.mfqqpa.cn/17373.Docm.dgi.mfqqpa.cn/39519.Docm.dgi.mfqqpa.cn/31913.Docm.dgu.mfqqpa.cn/15339.Docm.dgu.mfqqpa.cn/19137.Docm.dgu.mfqqpa.cn/55355.Docm.dgu.mfqqpa.cn/75395.Docm.dgu.mfqqpa.cn/19933.Docm.dgu.mfqqpa.cn/71537.Docm.dgu.mfqqpa.cn/53971.Docm.dgu.mfqqpa.cn/19593.Docm.dgu.mfqqpa.cn/95597.Docm.dgu.mfqqpa.cn/91791.Docm.dgy.mfqqpa.cn/79711.Docm.dgy.mfqqpa.cn/17535.Docm.dgy.mfqqpa.cn/51517.Docm.dgy.mfqqpa.cn/93991.Docm.dgy.mfqqpa.cn/95355.Docm.dgy.mfqqpa.cn/57395.Docm.dgy.mfqqpa.cn/59399.Docm.dgy.mfqqpa.cn/55733.Docm.dgy.mfqqpa.cn/35397.Docm.dgy.mfqqpa.cn/53195.Docm.dgt.mfqqpa.cn/39715.Docm.dgt.mfqqpa.cn/11939.Docm.dgt.mfqqpa.cn/35599.Docm.dgt.mfqqpa.cn/53317.Docm.dgt.mfqqpa.cn/33395.Docm.dgt.mfqqpa.cn/59331.Docm.dgt.mfqqpa.cn/39517.Docm.dgt.mfqqpa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