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#!/usr/bin/python | |
# to try this you'll need to edit in the name of your ruby binary and install bcc-tools | |
# bcc installation instructions are at https://github.com/iovisor/bcc/blob/master/INSTALL.md | |
from __future__ import print_function | |
from bcc import BPF | |
from time import sleep | |
import os | |
# load BPF program | |
b = BPF(text=""" | |
#include <uapi/linux/ptrace.h> | |
BPF_HASH(counts, size_t); | |
int count(struct pt_regs *ctx) { | |
u64 zero = 0, *val; | |
u64 key = 1; | |
size_t ptr = PT_REGS_PARM1(ctx); | |
val = counts.lookup_or_init(&ptr, &zero); | |
(*val)++; | |
return 0; | |
}; | |
""") | |
b.attach_uprobe(name="/home/bork/.rbenv/versions/2.4.0/bin/ruby", sym="newobj_slowpath", fn_name="count") | |
# header | |
print("Tracing newobj_slowpath()... Hit Ctrl-C to end.") | |
counts = b.get_table("counts") | |
while True: | |
sleep(1) | |
os.system('clear') | |
print("%20s | %s" % ("CLASS POINTER", "COUNT")) | |
print("%20s | %s" % ("", "")) | |
top = list(reversed(sorted([(counts.get(key).value, key.value) for key in counts.keys()]))) | |
top = top[:10] | |
for (count, ptr) in top: | |
print("%20s | %s" % (ptr, count)) | |
counts.clear() |
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