You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
154 lines
4.0 KiB
154 lines
4.0 KiB
#!/usr/bin/env python
|
|
# @lint-avoid-python-3-compatibility-imports
|
|
#
|
|
# softirqs Summarize soft IRQ (interrupt) event time.
|
|
# For Linux, uses BCC, eBPF.
|
|
#
|
|
# USAGE: softirqs [-h] [-T] [-N] [-d] [interval] [count]
|
|
#
|
|
# Copyright (c) 2015 Brendan Gregg.
|
|
# Licensed under the Apache License, Version 2.0 (the "License")
|
|
#
|
|
# 20-Oct-2015 Brendan Gregg Created this.
|
|
# 03-Apr-2017 Sasha Goldshtein Migrated to kernel tracepoints.
|
|
|
|
from __future__ import print_function
|
|
from bcc import BPF
|
|
from time import sleep, strftime
|
|
import argparse
|
|
|
|
# arguments
|
|
examples = """examples:
|
|
./softirqs # sum soft irq event time
|
|
./softirqs -d # show soft irq event time as histograms
|
|
./softirqs 1 10 # print 1 second summaries, 10 times
|
|
./softirqs -NT 1 # 1s summaries, nanoseconds, and timestamps
|
|
"""
|
|
parser = argparse.ArgumentParser(
|
|
description="Summarize soft irq event time as histograms.",
|
|
formatter_class=argparse.RawDescriptionHelpFormatter,
|
|
epilog=examples)
|
|
parser.add_argument("-T", "--timestamp", action="store_true",
|
|
help="include timestamp on output")
|
|
parser.add_argument("-N", "--nanoseconds", action="store_true",
|
|
help="output in nanoseconds")
|
|
parser.add_argument("-d", "--dist", action="store_true",
|
|
help="show distributions as histograms")
|
|
parser.add_argument("interval", nargs="?", default=99999999,
|
|
help="output interval, in seconds")
|
|
parser.add_argument("count", nargs="?", default=99999999,
|
|
help="number of outputs")
|
|
parser.add_argument("--ebpf", action="store_true",
|
|
help=argparse.SUPPRESS)
|
|
args = parser.parse_args()
|
|
countdown = int(args.count)
|
|
if args.nanoseconds:
|
|
factor = 1
|
|
label = "nsecs"
|
|
else:
|
|
factor = 1000
|
|
label = "usecs"
|
|
debug = 0
|
|
|
|
# define BPF program
|
|
bpf_text = """
|
|
#include <uapi/linux/ptrace.h>
|
|
|
|
typedef struct irq_key {
|
|
u32 vec;
|
|
u64 slot;
|
|
} irq_key_t;
|
|
|
|
typedef struct account_val {
|
|
u64 ts;
|
|
u32 vec;
|
|
} account_val_t;
|
|
|
|
BPF_HASH(start, u32, account_val_t);
|
|
BPF_HASH(iptr, u32);
|
|
BPF_HISTOGRAM(dist, irq_key_t);
|
|
|
|
TRACEPOINT_PROBE(irq, softirq_entry)
|
|
{
|
|
u32 pid = bpf_get_current_pid_tgid();
|
|
account_val_t val = {};
|
|
val.ts = bpf_ktime_get_ns();
|
|
val.vec = args->vec;
|
|
start.update(&pid, &val);
|
|
return 0;
|
|
}
|
|
|
|
TRACEPOINT_PROBE(irq, softirq_exit)
|
|
{
|
|
u64 delta;
|
|
u32 vec;
|
|
u32 pid = bpf_get_current_pid_tgid();
|
|
account_val_t *valp;
|
|
irq_key_t key = {0};
|
|
|
|
// fetch timestamp and calculate delta
|
|
valp = start.lookup(&pid);
|
|
if (valp == 0) {
|
|
return 0; // missed start
|
|
}
|
|
delta = bpf_ktime_get_ns() - valp->ts;
|
|
vec = valp->vec;
|
|
|
|
// store as sum or histogram
|
|
STORE
|
|
|
|
start.delete(&pid);
|
|
return 0;
|
|
}
|
|
"""
|
|
|
|
# code substitutions
|
|
if args.dist:
|
|
bpf_text = bpf_text.replace('STORE',
|
|
'key.vec = vec; key.slot = bpf_log2l(delta / %d); ' % factor +
|
|
'dist.increment(key);')
|
|
else:
|
|
bpf_text = bpf_text.replace('STORE',
|
|
'key.vec = valp->vec; ' +
|
|
'dist.increment(key, delta);')
|
|
if debug or args.ebpf:
|
|
print(bpf_text)
|
|
if args.ebpf:
|
|
exit()
|
|
|
|
# load BPF program
|
|
b = BPF(text=bpf_text)
|
|
|
|
def vec_to_name(vec):
|
|
# copied from softirq_to_name() in kernel/softirq.c
|
|
# may need updates if new softirq handlers are added
|
|
return ["hi", "timer", "net_tx", "net_rx", "block", "irq_poll",
|
|
"tasklet", "sched", "hrtimer", "rcu"][vec]
|
|
|
|
print("Tracing soft irq event time... Hit Ctrl-C to end.")
|
|
|
|
# output
|
|
exiting = 0 if args.interval else 1
|
|
dist = b.get_table("dist")
|
|
while (1):
|
|
try:
|
|
sleep(int(args.interval))
|
|
except KeyboardInterrupt:
|
|
exiting = 1
|
|
|
|
print()
|
|
if args.timestamp:
|
|
print("%-8s\n" % strftime("%H:%M:%S"), end="")
|
|
|
|
if args.dist:
|
|
dist.print_log2_hist(label, "softirq", section_print_fn=vec_to_name)
|
|
else:
|
|
print("%-16s %11s" % ("SOFTIRQ", "TOTAL_" + label))
|
|
for k, v in sorted(dist.items(), key=lambda dist: dist[1].value):
|
|
print("%-16s %11d" % (vec_to_name(k.vec), v.value / factor))
|
|
dist.clear()
|
|
|
|
countdown -= 1
|
|
if exiting or countdown == 0:
|
|
exit()
|