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LanGraph

Latency Graph for linux ftrace scheduler latency analysis,base on trace-cmd.

support evnet:

/sys/kernel/debug/tracing/events/sched/ sched_kthread_stop sched_kthread_stop_ret sched_kthread_work_execute_end sched_kthread_work_execute_start sched_kthread_work_queue_work sched_migrate_task sched_move_numa sched_pi_setprio sched_process_exec sched_process_exit sched_process_fork sched_process_free sched_process_hang sched_process_wait sched_stat_blocked sched_stat_iowait sched_stat_runtime sched_stat_sleep sched_stat_wait sched_stick_numa sched_swap_numa sched_switch sched_wait_task sched_wake_idle_without_ipi sched_wakeup sched_wakeup_new sched_waking

/sys/kernel/debug/tracing/events/irq irq_handler_entry irq_handler_exit softirq_entry softirq_exit softirq_raise

cat /sys/kernel/debug/tracing/events/sched/*/format name: sched_kthread_stop ID: 326 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;

print fmt: "comm=%s pid=%d", REC->comm, REC->pid name: sched_kthread_stop_ret ID: 325 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:int ret;  offset:8;       size:4; signed:1;

print fmt: "ret=%d", REC->ret name: sched_kthread_work_execute_end ID: 322 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:void * work;      offset:8;       size:8; signed:0;
    field:void * function;  offset:16;      size:8; signed:0;

print fmt: "work struct %p: function %ps", REC->work, REC->function name: sched_kthread_work_execute_start ID: 323 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:void * work;      offset:8;       size:8; signed:0;
    field:void * function;  offset:16;      size:8; signed:0;

print fmt: "work struct %p: function %ps", REC->work, REC->function name: sched_kthread_work_queue_work ID: 324 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:void * work;      offset:8;       size:8; signed:0;
    field:void * function;  offset:16;      size:8; signed:0;
    field:void * worker;    offset:24;      size:8; signed:0;

print fmt: "work struct=%p function=%ps worker=%p", REC->work, REC->function, REC->worker name: sched_migrate_task ID: 317 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;
    field:int orig_cpu;     offset:32;      size:4; signed:1;
    field:int dest_cpu;     offset:36;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d orig_cpu=%d dest_cpu=%d", REC->comm, REC->pid, REC->prio, REC->orig_cpu, REC->dest_cpu name: sched_move_numa ID: 303 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:pid_t pid;        offset:8;       size:4; signed:1;
    field:pid_t tgid;       offset:12;      size:4; signed:1;
    field:pid_t ngid;       offset:16;      size:4; signed:1;
    field:int src_cpu;      offset:20;      size:4; signed:1;
    field:int src_nid;      offset:24;      size:4; signed:1;
    field:int dst_cpu;      offset:28;      size:4; signed:1;
    field:int dst_nid;      offset:32;      size:4; signed:1;

print fmt: "pid=%d tgid=%d ngid=%d src_cpu=%d src_nid=%d dst_cpu=%d dst_nid=%d", REC->pid, REC->tgid, REC->ngid, REC->src_cpu, REC->src_nid, REC->dst_cpu, REC->dst_nid name: sched_pi_setprio ID: 305 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int oldprio;      offset:28;      size:4; signed:1;
    field:int newprio;      offset:32;      size:4; signed:1;

print fmt: "comm=%s pid=%d oldprio=%d newprio=%d", REC->comm, REC->pid, REC->oldprio, REC->newprio name: sched_process_exec ID: 311 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:__data_loc char[] filename;       offset:8;       size:4; signed:1;
    field:pid_t pid;        offset:12;      size:4; signed:1;
    field:pid_t old_pid;    offset:16;      size:4; signed:1;

print fmt: "filename=%s pid=%d old_pid=%d", __get_str(filename), REC->pid, REC->old_pid name: sched_process_exit ID: 315 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d", REC->comm, REC->pid, REC->prio name: sched_process_fork ID: 312 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char parent_comm[16];     offset:8;       size:16;        signed:1;
    field:pid_t parent_pid; offset:24;      size:4; signed:1;
    field:char child_comm[16];      offset:28;      size:16;        signed:1;
    field:pid_t child_pid;  offset:44;      size:4; signed:1;

print fmt: "comm=%s pid=%d child_comm=%s child_pid=%d", REC->parent_comm, REC->parent_pid, REC->child_comm, REC->child_pid name: sched_process_free ID: 316 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d", REC->comm, REC->pid, REC->prio name: sched_process_hang ID: 304 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;

print fmt: "comm=%s pid=%d", REC->comm, REC->pid name: sched_process_wait ID: 313 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d", REC->comm, REC->pid, REC->prio name: sched_stat_blocked ID: 307 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:u64 delay;        offset:32;      size:8; signed:0;

print fmt: "comm=%s pid=%d delay=%Lu [ns]", REC->comm, REC->pid, (unsigned long long)REC->delay name: sched_stat_iowait ID: 308 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:u64 delay;        offset:32;      size:8; signed:0;

print fmt: "comm=%s pid=%d delay=%Lu [ns]", REC->comm, REC->pid, (unsigned long long)REC->delay name: sched_stat_runtime ID: 306 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:u64 runtime;      offset:32;      size:8; signed:0;
    field:u64 vruntime;     offset:40;      size:8; signed:0;

print fmt: "comm=%s pid=%d runtime=%Lu [ns] vruntime=%Lu [ns]", REC->comm, REC->pid, (unsigned long long)REC->runtime, (unsigned long long)REC->vruntime name: sched_stat_sleep ID: 309 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:u64 delay;        offset:32;      size:8; signed:0;

print fmt: "comm=%s pid=%d delay=%Lu [ns]", REC->comm, REC->pid, (unsigned long long)REC->delay name: sched_stat_wait ID: 310 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:u64 delay;        offset:32;      size:8; signed:0;

print fmt: "comm=%s pid=%d delay=%Lu [ns]", REC->comm, REC->pid, (unsigned long long)REC->delay name: sched_stick_numa ID: 302 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:pid_t src_pid;    offset:8;       size:4; signed:1;
    field:pid_t src_tgid;   offset:12;      size:4; signed:1;
    field:pid_t src_ngid;   offset:16;      size:4; signed:1;
    field:int src_cpu;      offset:20;      size:4; signed:1;
    field:int src_nid;      offset:24;      size:4; signed:1;
    field:pid_t dst_pid;    offset:28;      size:4; signed:1;
    field:pid_t dst_tgid;   offset:32;      size:4; signed:1;
    field:pid_t dst_ngid;   offset:36;      size:4; signed:1;
    field:int dst_cpu;      offset:40;      size:4; signed:1;
    field:int dst_nid;      offset:44;      size:4; signed:1;

print fmt: "src_pid=%d src_tgid=%d src_ngid=%d src_cpu=%d src_nid=%d dst_pid=%d dst_tgid=%d dst_ngid=%d dst_cpu=%d dst_nid=%d", REC->src_pid, REC->src_tgid, REC->src_ngid, REC->src_cpu, REC->src_nid, REC->dst_pid, REC->dst_tgid, REC->dst_ngid, REC->dst_cpu, REC->dst_nid name: sched_swap_numa ID: 301 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:pid_t src_pid;    offset:8;       size:4; signed:1;
    field:pid_t src_tgid;   offset:12;      size:4; signed:1;
    field:pid_t src_ngid;   offset:16;      size:4; signed:1;
    field:int src_cpu;      offset:20;      size:4; signed:1;
    field:int src_nid;      offset:24;      size:4; signed:1;
    field:pid_t dst_pid;    offset:28;      size:4; signed:1;
    field:pid_t dst_tgid;   offset:32;      size:4; signed:1;
    field:pid_t dst_ngid;   offset:36;      size:4; signed:1;
    field:int dst_cpu;      offset:40;      size:4; signed:1;
    field:int dst_nid;      offset:44;      size:4; signed:1;

print fmt: "src_pid=%d src_tgid=%d src_ngid=%d src_cpu=%d src_nid=%d dst_pid=%d dst_tgid=%d dst_ngid=%d dst_cpu=%d dst_nid=%d", REC->src_pid, REC->src_tgid, REC->src_ngid, REC->src_cpu, REC->src_nid, REC->dst_pid, REC->dst_tgid, REC->dst_ngid, REC->dst_cpu, REC->dst_nid name: sched_switch ID: 318 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char prev_comm[16];       offset:8;       size:16;        signed:1;
    field:pid_t prev_pid;   offset:24;      size:4; signed:1;
    field:int prev_prio;    offset:28;      size:4; signed:1;
    field:long prev_state;  offset:32;      size:8; signed:1;
    field:char next_comm[16];       offset:40;      size:16;        signed:1;
    field:pid_t next_pid;   offset:56;      size:4; signed:1;
    field:int next_prio;    offset:60;      size:4; signed:1;

print fmt: "prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%s%s ==> next_comm=%s next_pid=%d next_prio=%d", REC->prev_comm, REC->prev_pid, REC->prev_prio, (REC->prev_state & ((((0x0000 | 0x0001 | 0x0002 | 0x0004 | 0x0008 | 0x0010 | 0x0020 | 0x0040) + 1) << 1) - 1)) ? __print_flags(REC->prev_state & ((((0x0000 | 0x0001 | 0x0002 | 0x0004 | 0x0008 | 0x0010 | 0x0020 | 0x0040) + 1) << 1) - 1), "|", { 0x0001, "S" }, { 0x0002, "D" }, { 0x0004, "T" }, { 0x0008, "t" }, { 0x0010, "X" }, { 0x0020, "Z" }, { 0x0040, "P" }, { 0x0080, "I" }) : "R", REC->prev_state & (((0x0000 | 0x0001 | 0x0002 | 0x0004 | 0x0008 | 0x0010 | 0x0020 | 0x0040) + 1) << 1) ? "+" : "", REC->next_comm, REC->next_pid, REC->next_prio name: sched_wait_task ID: 314 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d", REC->comm, REC->pid, REC->prio name: sched_wake_idle_without_ipi ID: 300 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:int cpu;  offset:8;       size:4; signed:1;

print fmt: "cpu=%d", REC->cpu name: sched_wakeup ID: 320 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;
    field:int target_cpu;   offset:32;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d target_cpu=%03d", REC->comm, REC->pid, REC->prio, REC->target_cpu name: sched_wakeup_new ID: 319 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;
    field:int target_cpu;   offset:32;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d target_cpu=%03d", REC->comm, REC->pid, REC->prio, REC->target_cpu name: sched_waking ID: 321 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:char comm[16];    offset:8;       size:16;        signed:1;
    field:pid_t pid;        offset:24;      size:4; signed:1;
    field:int prio; offset:28;      size:4; signed:1;
    field:int target_cpu;   offset:32;      size:4; signed:1;

print fmt: "comm=%s pid=%d prio=%d target_cpu=%03d", REC->comm, REC->pid, REC->prio, REC->target_cpu root@lanhao-VirtualBox:/home/lanhao# cat /sys/kernel/debug/tracing/events/irq/*/format name: irq_handler_entry ID: 151 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:int irq;  offset:8;       size:4; signed:1;
    field:__data_loc char[] name;   offset:12;      size:4; signed:1;

print fmt: "irq=%d name=%s", REC->irq, __get_str(name) name: irq_handler_exit ID: 150 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:int irq;  offset:8;       size:4; signed:1;
    field:int ret;  offset:12;      size:4; signed:1;

print fmt: "irq=%d ret=%s", REC->irq, REC->ret ? "handled" : "unhandled" name: softirq_entry ID: 149 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:unsigned int vec; offset:8;       size:4; signed:0;

print fmt: "vec=%u [action=%s]", REC->vec, __print_symbolic(REC->vec, { 0, "HI" }, { 1, "TIMER" }, { 2, "NET_TX" }, { 3, "NET_RX" }, { 4, "BLOCK" }, { 5, "IRQ_POLL" }, { 6, "TASKLET" }, { 7, "SCHED" }, { 8, "HRTIMER" }, { 9, "RCU" }) name: softirq_exit ID: 148 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:unsigned int vec; offset:8;       size:4; signed:0;

print fmt: "vec=%u [action=%s]", REC->vec, __print_symbolic(REC->vec, { 0, "HI" }, { 1, "TIMER" }, { 2, "NET_TX" }, { 3, "NET_RX" }, { 4, "BLOCK" }, { 5, "IRQ_POLL" }, { 6, "TASKLET" }, { 7, "SCHED" }, { 8, "HRTIMER" }, { 9, "RCU" }) name: softirq_raise ID: 147 format: field:unsigned short common_type; offset:0; size:2; signed:0; field:unsigned char common_flags; offset:2; size:1; signed:0; field:unsigned char common_preempt_count; offset:3; size:1; signed:0; field:int common_pid; offset:4; size:4; signed:1;

    field:unsigned int vec; offset:8;       size:4; signed:0;

print fmt: "vec=%u [action=%s]", REC->vec, __print_symbolic(REC->vec, { 0, "HI" }, { 1, "TIMER" }, { 2, "NET_TX" }, { 3, "NET_RX" }, { 4, "BLOCK" }, { 5, "IRQ_POLL" }, { 6, "TASKLET" }, { 7, "SCHED" }, { 8, "HRTIMER" }, { 9, "RCU" }) root@lanhao-VirtualBox:/home/lanhao#

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