kgdb

最近在玩kgdb
似乎人们对于kgdb的热情不高
现在sf.net上cvs里的kgdb只能打在2.6.17内核上
目前的龙芯用的是2.6.18.1，好在要改动的地方不是很多，也不难
kgdb管理补丁用的是quilt，稍微看看man就明白了，用起来很方便
其实vanilla 2.6.18.1里也有一个kgdb选项，但实际上似乎是不能用的，连个断点都设置不了
之前我编的内核有两个问题，一个是网络传输速度慢，scp的时候经常断，如果用debian，速度恒定保持在2.x
M/s，一个是字符界面在显示器上显示不出，显示器报告超出范围，debian里正常。我之前用的是从dev.lemote.com里checkout出来的内核代码里面自带的配置文件，稍做了改动。后来我用了debian的/proc/config.gz，就好了。可是我对比两个config也没看出有什么差异可以导致这两个问题。目前还是一个谜。
最后玩kgdb光靠串口来控制还是不行，现在continue之后，gdb里显示到free多少多少memory之后，就没有任何信息了，但是在显示器上可以看到实际上已经成功启动了。
kgdb真的很爽，如果想让目标机器的内核停止运行，并等待被开发机器上的gdb连接和控制，只需要在开发机器上执行
echo -e "\003" > /dev/ttyS1

Comments

Post a Comment

Popular posts from this blog

The diff between the original SEC complaint against Ripple and the amended one

--- original.txt 2021-02-18 18:32:43.171832036 -0800 +++ amended.txt 2021-02-18 18:32:29.103735165 -0800 @@ -1,4 +1,4 @@ -Case 1:20-cv-10832 Document 4 Filed 12/22/20 Page 1 of 71 +Case 1:20-cv-10832-AT Document 46 Filed 02/18/21 Page 1 of 79 Richard Best Kristina Littman @@ -34,9 +34,9 @@ : ------------------------------------------------------------------------x -20 Civ. 10832 +20 Civ. 10832 (AT) ECF Case -Complaint +First Amended Complaint Jury Trial Demanded Plaintiff Securities and Exchange Commission (the “SEC”), for its Complaint against @@ -53,7 +53,7 @@ required by the federal securities laws, and no exemption from this requirement applied. 1 -Case 1:20-cv-10832 Document 4 Filed 12/22/20 Page 2 of 71 +Case 1:20-cv-10832-AT Document 46 Filed 02/18/21 Page 2 of 79 2. @@ -103,7 +103,7 @@ 2 -Case 1:20-cv-10832 Document 4 Filed 12/22/20 Page 3 of 71 +Case 1:20-cv-10832-AT Document 46 Filed 02/18/21 Page 3 of 79 VIOLATIONS 9. @@ -150,
Read more

Send $SGB (Songbird) to another wallet using a script

You need nodejs and web3 to run it:  const Web3 = require('web3'); // Variables definition const privKey = '8xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx2'; // Genesis private key const addressFrom = '0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA'; const addressTo = '0xBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB'; const web3 = new Web3('https://songbird.towolabs.com/rpc'); // Create transaction const deploy = async () => { console.log( `Attempting to make transaction from ${addressFrom} to ${addressTo}` ); const createTransaction = await web3.eth.accounts.signTransaction( { from: addressFrom, to: addressTo, value: web3.utils.toWei('1', 'ether'), // Send 1 SGB. 'ether' is not a typo here. gasPrice: web3.utils.toWei('225', 'Gwei'), gas: '21000', }, privKey ); // Deploy transaction const createR
Read more

Rippled thread cpu usage

Image
The cpu usage of xrp.ninja validator spikes every 2 hours. I always wonder what it is doing during the spikes. So I wrote a script to report the thead cpu usage to a statsd server.  I started statsd/graphite/grafana using  https://github.com/ripple/rippledmon Then I wrote this script: #!/usr/bin/python3 import collections import itertools import os import re import statsd import subprocess import time HEADER = b'%CPU COMMAND' STATSD = 'XXX' PORT = 'YYY' PREFIX = 'rippled.threads' TOP = 'env HOME={0} top -b -n 1 -p $(pgrep rippled) -H'.format(os.getcwd()) def report(c, jobs): p = subprocess.run(TOP, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE) if p.returncode != 0: print(p.stderr) return m = collections.defaultdict(float) for line in itertools.dropwhile(lambda x: x != HEADER, p.stdout.splitlines()): if line == HEADER: continue usage, comm = line.decode().str
Read more