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#! /usr/bin/python3 # # wakeuptime Summarize sleep to wakeup time by waker kernel stack # For Linux, uses BCC, eBPF. # # USAGE: wakeuptime [-h] [-u] [-p PID] [-v] [-f] [duration] # # Copyright 2016 Netflix, Inc. # Licensed under the Apache License, Version 2.0 (the "License") # # 14-Jan-2016 Brendan Gregg Created this. # 03-Apr-2023 Rocky Xing Modified the order of stack output. # 04-Apr-2023 Rocky Xing Updated default stack storage size. from __future__ import print_function from bcc import BPF from bcc.utils import printb from time import sleep import argparse import signal import errno from sys import stderr # arg validation def positive_int(val): try: ival = int(val) except ValueError: raise argparse.ArgumentTypeError("must be an integer") if ival < 0: raise argparse.ArgumentTypeError("must be positive") return ival def positive_nonzero_int(val): ival = positive_int(val) if ival == 0: raise argparse.ArgumentTypeError("must be nonzero") return ival # arguments examples = """examples: ./wakeuptime # trace blocked time with waker stacks ./wakeuptime 5 # trace for 5 seconds only ./wakeuptime -f 5 # 5 seconds, and output in folded format ./wakeuptime -u # don't include kernel threads (user only) ./wakeuptime -p 185 # trace for PID 185 only """ parser = argparse.ArgumentParser( description="Summarize sleep to wakeup time by waker kernel stack", formatter_class=argparse.RawDescriptionHelpFormatter, epilog=examples) parser.add_argument("-u", "--useronly", action="store_true", help="user threads only (no kernel threads)") parser.add_argument("-p", "--pid", type=positive_int, help="trace this PID only") parser.add_argument("-v", "--verbose", action="store_true", help="show raw addresses") parser.add_argument("-f", "--folded", action="store_true", help="output folded format") parser.add_argument("--stack-storage-size", default=16384, type=positive_nonzero_int, help="the number of unique stack traces that can be stored and " "displayed (default 16384)") parser.add_argument("duration", nargs="?", default=99999999, type=positive_nonzero_int, help="duration of trace, in seconds") parser.add_argument("-m", "--min-block-time", default=1, type=positive_nonzero_int, help="the amount of time in microseconds over which we " + "store traces (default 1)") parser.add_argument("-M", "--max-block-time", default=(1 << 64) - 1, type=positive_nonzero_int, help="the amount of time in microseconds under which we " + "store traces (default U64_MAX)") parser.add_argument("--ebpf", action="store_true", help=argparse.SUPPRESS) args = parser.parse_args() folded = args.folded duration = int(args.duration) debug = 0 if args.pid and args.useronly: parser.error("use either -p or -u.") # signal handler def signal_ignore(signal, frame): print() # define BPF program bpf_text = """ #include <uapi/linux/ptrace.h> #include <linux/sched.h> #define MINBLOCK_US MINBLOCK_US_VALUEULL #define MAXBLOCK_US MAXBLOCK_US_VALUEULL struct key_t { int w_k_stack_id; char waker[TASK_COMM_LEN]; char target[TASK_COMM_LEN]; }; BPF_HASH(counts, struct key_t); BPF_HASH(start, u32); BPF_STACK_TRACE(stack_traces, STACK_STORAGE_SIZE); static int offcpu_sched_switch() { u64 pid_tgid = bpf_get_current_pid_tgid(); u32 pid = pid_tgid >> 32; u32 tid = (u32)pid_tgid; struct task_struct *p = (struct task_struct *) bpf_get_current_task(); u64 ts; if (FILTER) return 0; ts = bpf_ktime_get_ns(); start.update(&tid, &ts); return 0; } static int wakeup(ARG0, struct task_struct *p) { u32 pid = p->tgid; u32 tid = p->pid; u64 delta, *tsp, ts; tsp = start.lookup(&tid); if (tsp == 0) return 0; // missed start start.delete(&tid); if (FILTER) return 0; // calculate delta time delta = bpf_ktime_get_ns() - *tsp; delta = delta / 1000; if ((delta < MINBLOCK_US) || (delta > MAXBLOCK_US)) return 0; struct key_t key = {}; key.w_k_stack_id = stack_traces.get_stackid(ctx, 0); bpf_probe_read_kernel(&key.target, sizeof(key.target), p->comm); bpf_get_current_comm(&key.waker, sizeof(key.waker)); counts.atomic_increment(key, delta); return 0; } """ bpf_text_kprobe = """ int offcpu(struct pt_regs *ctx) { return offcpu_sched_switch(); } int waker(struct pt_regs *ctx, struct task_struct *p) { return wakeup(ctx, p); } """ bpf_text_raw_tp = """ RAW_TRACEPOINT_PROBE(sched_switch) { // TP_PROTO(bool preempt, struct task_struct *prev, struct task_struct *next) return offcpu_sched_switch(); } RAW_TRACEPOINT_PROBE(sched_wakeup) { // TP_PROTO(struct task_struct *p) struct task_struct *p = (struct task_struct *)ctx->args[0]; return wakeup(ctx, p); } """ is_supported_raw_tp = BPF.support_raw_tracepoint() if is_supported_raw_tp: bpf_text += bpf_text_raw_tp else: bpf_text += bpf_text_kprobe if args.pid: filter = 'pid != %s' % args.pid elif args.useronly: filter = 'p->flags & PF_KTHREAD' else: filter = '0' bpf_text = bpf_text.replace('FILTER', filter) if is_supported_raw_tp: arg0 = 'struct bpf_raw_tracepoint_args *ctx' else: arg0 = 'struct pt_regs *ctx' bpf_text = bpf_text.replace('ARG0', arg0) # set stack storage size bpf_text = bpf_text.replace('STACK_STORAGE_SIZE', str(args.stack_storage_size)) bpf_text = bpf_text.replace('MINBLOCK_US_VALUE', str(args.min_block_time)) bpf_text = bpf_text.replace('MAXBLOCK_US_VALUE', str(args.max_block_time)) if debug or args.ebpf: print(bpf_text) if args.ebpf: exit() # initialize BPF b = BPF(text=bpf_text) if not is_supported_raw_tp: b.attach_kprobe(event="schedule", fn_name="offcpu") b.attach_kprobe(event="try_to_wake_up", fn_name="waker") matched = b.num_open_kprobes() if matched == 0: print("0 functions traced. Exiting.") exit() # check whether hash table batch ops is supported htab_batch_ops = True if BPF.kernel_struct_has_field(b'bpf_map_ops', b'map_lookup_and_delete_batch') == 1 else False # header if not folded: print("Tracing blocked time (us) by kernel stack", end="") if duration < 99999999: print(" for %d secs." % duration) else: print("... Hit Ctrl-C to end.") # output while (1): try: sleep(duration) except KeyboardInterrupt: # as cleanup can take many seconds, trap Ctrl-C: signal.signal(signal.SIGINT, signal_ignore) if not folded: print() missing_stacks = 0 has_enomem = False counts = b.get_table("counts") stack_traces = b.get_table("stack_traces") for k, v in sorted(counts.items_lookup_and_delete_batch() if htab_batch_ops else counts.items(), key=lambda counts: counts[1].value): # handle get_stackid errors # check for an ENOMEM error if k.w_k_stack_id == -errno.ENOMEM: missing_stacks += 1 continue waker_kernel_stack = [] if k.w_k_stack_id < 1 else \ list(stack_traces.walk(k.w_k_stack_id))[1:] if folded: # print folded stack output line = \ [k.waker] + \ [b.ksym(addr) for addr in reversed(waker_kernel_stack)] + \ [k.target] printb(b"%s %d" % (b";".join(line), v.value)) else: # print default multi-line stack output printb(b" %-16s %s" % (b"target:", k.target)) for addr in waker_kernel_stack: printb(b" %-16x %s" % (addr, b.ksym(addr))) printb(b" %-16s %s" % (b"waker:", k.waker)) print(" %d\n" % v.value) if not htab_batch_ops: counts.clear() if missing_stacks > 0: enomem_str = " Consider increasing --stack-storage-size." print("WARNING: %d stack traces could not be displayed.%s" % (missing_stacks, enomem_str), file=stderr) if not folded: print("Detaching...") exit()