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#! /usr/bin/python3 # @lint-avoid-python-3-compatibility-imports # # drsnoop Trace direct reclaim and print details including issuing PID. # For Linux, uses BCC, eBPF. # # This uses in-kernel eBPF maps to cache process details (PID and comm) by # direct reclaim begin, as well as a starting timestamp for calculating # latency. # # Copyright (c) 2019 Wenbo Zhang # Licensed under the Apache License, Version 2.0 (the "License") # # 20-Feb-2019 Wenbo Zhang Created this. # 09-Mar-2019 Wenbo Zhang Updated for show sys mem info. from __future__ import print_function from bcc import ArgString, BPF import argparse from datetime import datetime, timedelta import os import math import sys # symbols kallsyms = "/proc/kallsyms" # arguments examples = """examples: ./drsnoop # trace all direct reclaim ./drsnoop -T # include timestamps ./drsnoop -U # include UID ./drsnoop -P 181 # only trace PID 181 ./drsnoop -t 123 # only trace TID 123 ./drsnoop -u 1000 # only trace UID 1000 ./drsnoop -d 10 # trace for 10 seconds only ./drsnoop -n main # only print process names containing "main" """ parser = argparse.ArgumentParser( description="Trace direct reclaim", formatter_class=argparse.RawDescriptionHelpFormatter, epilog=examples) parser.add_argument("-T", "--timestamp", action="store_true", help="include timestamp on output") parser.add_argument("-U", "--print-uid", action="store_true", help="print UID column") parser.add_argument("-p", "--pid", help="trace this PID only") parser.add_argument("-t", "--tid", help="trace this TID only") parser.add_argument("-u", "--uid", help="trace this UID only") parser.add_argument("-d", "--duration", help="total duration of trace in seconds") parser.add_argument("-n", "--name", type=ArgString, help="only print process names containing this name") parser.add_argument("-v", "--verbose", action="store_true", help="show system memory state") parser.add_argument("--ebpf", action="store_true", help=argparse.SUPPRESS) args = parser.parse_args() debug = 0 if args.duration: args.duration = timedelta(seconds=int(args.duration)) # vm_stat vm_stat_addr = '' with open(kallsyms) as syms: for line in syms: (addr, size, name) = line.rstrip().split(" ", 2) name = name.split("\t")[0] if name == "vm_stat": vm_stat_addr = "0x" + addr break if name == "vm_zone_stat": vm_stat_addr = "0x" + addr break if vm_stat_addr == '': print("ERROR: no vm_stat or vm_zone_stat in /proc/kallsyms. Exiting.") print("HINT: the kernel should be built with CONFIG_KALLSYMS_ALL.") exit() NR_FREE_PAGES = 0 PAGE_SIZE = os.sysconf("SC_PAGE_SIZE") PAGE_SHIFT = int(math.log(PAGE_SIZE) / math.log(2)) def K(x): return x << (PAGE_SHIFT - 10) # load BPF program bpf_text = """ #include <uapi/linux/ptrace.h> #include <linux/sched.h> #include <linux/mmzone.h> struct val_t { u64 id; u64 ts; // start time char name[TASK_COMM_LEN]; u64 vm_stat[NR_VM_ZONE_STAT_ITEMS]; }; struct data_t { u64 id; u32 uid; u64 nr_reclaimed; u64 delta; u64 ts; // end time char name[TASK_COMM_LEN]; u64 vm_stat[NR_VM_ZONE_STAT_ITEMS]; }; BPF_HASH(start, u64, struct val_t); BPF_PERF_OUTPUT(events); TRACEPOINT_PROBE(vmscan, mm_vmscan_direct_reclaim_begin) { struct val_t val = {}; u64 id = bpf_get_current_pid_tgid(); u32 pid = id >> 32; // PID is higher part u32 tid = id; // Cast and get the lower part u32 uid = bpf_get_current_uid_gid(); u64 ts; PID_TID_FILTER UID_FILTER if (bpf_get_current_comm(&val.name, sizeof(val.name)) == 0) { val.id = id; val.ts = bpf_ktime_get_ns(); bpf_probe_read_kernel(&val.vm_stat, sizeof(val.vm_stat), (const void *)%s); start.update(&id, &val); } return 0; } TRACEPOINT_PROBE(vmscan, mm_vmscan_direct_reclaim_end) { u64 id = bpf_get_current_pid_tgid(); struct val_t *valp; struct data_t data = {}; u64 ts = bpf_ktime_get_ns(); valp = start.lookup(&id); if (valp == NULL) { // missed entry return 0; } data.delta = ts - valp->ts; data.ts = ts / 1000; data.id = valp->id; data.uid = bpf_get_current_uid_gid(); bpf_probe_read_kernel(&data.name, sizeof(data.name), valp->name); bpf_probe_read_kernel(&data.vm_stat, sizeof(data.vm_stat), valp->vm_stat); data.nr_reclaimed = args->nr_reclaimed; events.perf_submit(args, &data, sizeof(data)); start.delete(&id); return 0; } """ % vm_stat_addr if args.tid: # TID trumps PID bpf_text = bpf_text.replace('PID_TID_FILTER', 'if (tid != %s) { return 0; }' % args.tid) elif args.pid: bpf_text = bpf_text.replace('PID_TID_FILTER', 'if (pid != %s) { return 0; }' % args.pid) else: bpf_text = bpf_text.replace('PID_TID_FILTER', '') if args.uid: bpf_text = bpf_text.replace('UID_FILTER', 'if (uid != %s) { return 0; }' % args.uid) else: bpf_text = bpf_text.replace('UID_FILTER', '') if debug or args.ebpf: print(bpf_text) if args.ebpf: exit() # initialize BPF b = BPF(text=bpf_text) initial_ts = 0 # header if args.timestamp: print("%-14s" % ("TIME(s)"), end="") if args.print_uid: print("%-6s" % ("UID"), end="") print("%-14s %-6s %8s %5s" % ("COMM", "TID" if args.tid else "PID", "LAT(ms)", "PAGES"), end="") if args.verbose: print("%10s" % ("FREE(KB)")) else: print("") # process event def print_event(cpu, data, size): event = b["events"].event(data) global initial_ts if not initial_ts: initial_ts = event.ts if args.name and bytes(args.name) not in event.name: return if args.timestamp: delta = event.ts - initial_ts print("%-14.9f" % (float(delta) / 1000000), end="") if args.print_uid: print("%-6d" % event.uid, end="") print("%-14.14s %-6s %8.2f %5d" % (event.name.decode('utf-8', 'replace'), event.id & 0xffffffff if args.tid else event.id >> 32, float(event.delta) / 1000000, event.nr_reclaimed), end="") if args.verbose: print("%10d" % K(event.vm_stat[NR_FREE_PAGES])) else: print("") sys.stdout.flush() # loop with callback to print_event b["events"].open_perf_buffer(print_event, page_cnt=64) start_time = datetime.now() while not args.duration or datetime.now() - start_time < args.duration: try: b.perf_buffer_poll() except KeyboardInterrupt: exit()