/* Stack of return addresses for return function tracing: */ struct ftrace_ret_stack *ret_stack;/* Timestamp for last schedule: */ unsigned long long ftrace_timestamp;/* * Number of functions that haven't been traced * because of depth overrun: */ atomic_t trace_overrun;/* Pause trac...
struct pt_regs *regs,unsignedlongstack_size,int__user *parent_tidptr,int__user *child_tidptr){//...structtask_struct*p=NULL;p =dup_task_struct(current);//...if(nr_threads >= max_threads)gotobad_fork_cleanup_count;//...#ifdefCONFIG_PREEMPTp->thread_info->preempt_count =1;#endifp...
现有方案主要分为几类: per-CPU 缓冲区(如 perf、ftrace 等),无法满足排序和内存消耗的需求; 基于链表的实现,尽管有些是多生产者设计,但从用户空间消费时可能非常复杂且性能较差; io_uring 是 SPSC,但也要求固定大小的元素。简单地将 SPSC 队列转换为 MPSC 会导致性能不足; 专用实现(例如新的 printk Ring ...
static void uprobe_perf_print(struct trace_uprobe *tu, unsigned long func, struct pt_regs *regs) { - struct ftrace_event_call *call = &tu->call; + struct ftrace_event_call *call = &tu->p.call; struct uprobe_trace_entry_head *entry; struct hlist_head *head; void *data; int si...
ftrace(二)新增tracepoint 内核的各个子系统已经有大量的跟踪点,如果这些跟踪点无法满足工作中的需求,可以自己手动添加跟踪点。 添加跟踪点有两种方式,一种是仿照events/目录下的跟踪点,使用TRACE_EVENT() 宏添加。...首先,需要在include/trace/events/timer.h头文件种添加名为timer_stat的跟踪点。...proto:...
rec->arch.mod->arch.tramp_regs); -#endif - } else if (core_kernel_text(ip)) { + else if (core_kernel_text(ip)) /* We would be branching to one of our ftrace stubs */ stub = find_ftrace_tramp(ip); - if (!stub) { ...
domain;structrq;structsched_attr;structsched_param;structseq_file;structsighand_struct;structsignal_struct;structtask_delay_info;structtask_group;/** Task state bitmask. NOTE! These bits are also * encoded in fs/proc/array.c: get_task_state()....
per-CPU 缓冲区(如 perf、ftrace 等),无法满足排序和内存消耗的需求; 基于链表的实现,尽管有些是多生产者设计,但从用户空间消费时可能非常复杂且性能较差; io_uring 是 SPSC,但也要求固定大小的元素。简单地将 SPSC 队列转换为 MPSC 会导致性能不足; ...