ChinaXing’s gists

ChinaXing / btrace-java-agent.sh

Created April 27, 2020 09:13

btrace java agent

	# -------------- trace script Java source ---------------- #
	import com.sun.btrace.annotations.*;
	import static com.sun.btrace.BTraceUtils.*;
	import com.sun.btrace.AnyType;

	@BTrace // (trusted=true)
	public class Test {
	@OnMethod(
	clazz="java.net.ServerSocket",
	method="bind"

ChinaXing / fix-nic-teamd.sh

Created February 12, 2020 14:22

teamd fix

	yum erase ais-vnic -y # 卸载ali-vnic
	yum install teamd -y
	systemctl daemon-reload # systemctl 更新配置
	modprobe bonding # teamd依赖
	modprobe team # teamd依赖的驱动
	ip link del bond0 # 删除bond 驱动新增的网卡
	systemctl restart network # 启动网络，teamd 后台进程会启动 ps auxf \| grep teamd 查看确认

ChinaXing / MAT.sql

Created July 1, 2019 05:52

	-- 分析 unreachable对象 https://wiki.eclipse.org/MemoryAnalyzer/FAQ#How_to_analyse_unreachable_objects
	-consoleLog -application org.eclipse.mat.api.parse -keep_unreachable_objects <heapDump.bin>
	-- 查询非unreachable的对象，GCRootInfo null 表名此对象非GcRoot，MAT keepunreachable 对象时，unreachable对象的gcroot是自身
	SELECT * FROM byte[] s WHERE ((s.@length >= 2000000) and (s.@GCRootInfo = null))

ChinaXing / ps-tools.md

Last active November 16, 2018 06:27

ps-tools

show pid namespace all threads of process 21503

ps axH -opid,ppid,pidns -p 21503

list namespace of process 21503

lsns -p 21503

list namespace inode of process 21503

ls -iL /proc/21503/ns/pid

ChinaXing / jstat config

Created January 24, 2018 07:51

start jstatd all policy

	grant codebase "file:${java.home}/../lib/tools.jar" {
	permission java.security.AllPermission;
	};

	jstatd -J-Djava.security.policy=jstatd.all.policy

ChinaXing / packet-loose.sh

Created October 24, 2016 06:08

packet loose mock use tc

	#!/bin/env bash

	# --------------------------------------------
	#
	# 网络丢包模拟工具
	#
	# --------------------------------------------

	block(){
	interface=$1

ChinaXing / gist:302e053d03d8e53dfde2610e000b22d3

Created August 19, 2016 10:48

btrace probe field set

	import com.sun.btrace.annotations.*;
	import com.sun.btrace.AnyType;
	import static com.sun.btrace.BTraceUtils.*;

	@BTrace
	public class Q{
	@OnMethod(
	clazz="java.nio.Buffer",
	method="/.*/",
	location=@Location(value=Kind.FIELD_SET, clazz="java.nio.Buffer", field="po

ChinaXing / gist:0b7153f311b570bb319a998879a25bd5

Created August 19, 2016 10:48

btrace probe field set

	import com.sun.btrace.annotations.*;
	import com.sun.btrace.AnyType;
	import static com.sun.btrace.BTraceUtils.*;

	@BTrace
	public class Q{
	@OnMethod(
	clazz="java.nio.Buffer",
	method="/.*/",
	location=@Location(value=Kind.FIELD_SET, clazz="java.nio.Buffer", field="po

ChinaXing / gist:a5579fb1768b2184acc0c6c28cae116a

Created August 19, 2016 10:48

btrace probe field set

	import com.sun.btrace.annotations.*;
	import com.sun.btrace.AnyType;
	import static com.sun.btrace.BTraceUtils.*;

	@BTrace
	public class Q{
	@OnMethod(
	clazz="java.nio.Buffer",
	method="/.*/",
	location=@Location(value=Kind.FIELD_SET, clazz="java.nio.Buffer", field="po

ChinaXing / probe-net.stp

Created January 4, 2016 17:20

probe.stp

stap -e 'probe kernel.function("tcp_recvmsg") {sp = @cast($sk, "inet_sock")->num; dp = @cast($sk, "inet_sock")->sport; if(sp == 9091){ printf("hell,world, %d, %x\n", sp, dp);}}'

chinaxing ChinaXing

show pid namespace all threads of process 21503

list namespace of process 21503

list namespace inode of process 21503