BlogJava-小码哥-随笔分类-备忘http://www.blogjava.net/canvas/category/43532.html谁谓河广，一苇杭之zh-cnTue, 13 Nov 2012 08:12:11 GMTTue, 13 Nov 2012 08:12:11 GMT60关于openlayers的一些说明http://www.blogjava.net/canvas/archive/2012/11/13/about_openlayers.html小码哥小码哥Tue, 13 Nov 2012 01:25:00 GMThttp://www.blogjava.net/canvas/archive/2012/11/13/about_openlayers.htmlhttp://www.blogjava.net/canvas/comments/391239.htmlhttp://www.blogjava.net/canvas/archive/2012/11/13/about_openlayers.html#Feedback0http://www.blogjava.net/canvas/comments/commentRss/391239.htmlhttp://www.blogjava.net/canvas/services/trackbacks/391239.html
鉴于有不少openlayers的爱好者跟我讨论openlayers的一些开发问题，我想我还是把以前的思路整理一下，对openlayers做些精简和开发，弄一个直接可以使用的简单库出来。



小码哥 2012-11-13 09:25 发表评论
]]>使用gdb根据指令地址定位到C代码对应的行http://www.blogjava.net/canvas/archive/2012/11/06/how_to_use_gdb_to_find_the_kernel_source_code.html小码哥小码哥Tue, 06 Nov 2012 07:18:00 GMThttp://www.blogjava.net/canvas/archive/2012/11/06/how_to_use_gdb_to_find_the_kernel_source_code.htmlhttp://www.blogjava.net/canvas/comments/390882.htmlhttp://www.blogjava.net/canvas/archive/2012/11/06/how_to_use_gdb_to_find_the_kernel_source_code.html#Feedback0http://www.blogjava.net/canvas/comments/commentRss/390882.htmlhttp://www.blogjava.net/canvas/services/trackbacks/390882.html
addr2line也可以根据指令地址定位C代码对应的行，但是对于Kernel module却不是很方便，使用gdb就要容易得多。

NOTE：在使用gdb定位C代码之前需要开启-g选项编译内核或者module

例如有这样的Call Trace
Call Trace:
[<8033265c>] dump_stack+0x8/0x30
[<8003abbc>] warn_slowpath_common+0x70/0x98
[<80041f10>] local_bh_enable_ip+0x98/0xec
[<c13f1c6c>] ieee80211_alloc_node+0x29c/0x47c [umac]
[<c13f1f70>] ieee80211_reset_bss+0x58/0x154 [umac]
[<c13f7c84>] ieee80211_vap_attach+0x20/0x68 [umac]
[<c14096cc>] ath_vap_create+0x430/0x6b0 [umac]
[<c13f7290>] wlan_vap_create+0x58/0x210 [umac]
[<c14686e8>] osif_ioctl_create_vap+0x268/0x790 [umac]
[<c14597b0>] ath_ioctl+0x134/0x94c [umac]
[<8022db50>] dev_ioctl+0x28c/0x88

现在想定位指令：
[<80041f10>] local_bh_enable_ip+0x98/0xec

可以这样做：
$ mips-linux-gdb vmlinux

GNU gdb 6.8
Copyright (coffee) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=i386-pc-linux-gnu --target=mips-linux-uclibc"...

输入命令
(gdb) list *(local_bh_enable_ip+0x98)

gdb返回结果
0x80041f10 is in local_bh_enable_ip (kernel/softirq.c:216).
211
212 EXPORT_SYMBOL(_local_bh_enable);
213
214 static inline void _local_bh_enable_ip(unsigned long ip)
215 {
216  WARN_ON_ONCE(in_irq() || irqs_disabled());
217 #ifdef CONFIG_TRACE_IRQFLAGS
218  local_irq_disable();
219 #endif
220  /*
(gdb)


小码哥 2012-11-06 15:18 发表评论
]]>mark一下学习计划http://www.blogjava.net/canvas/archive/2011/05/11/mark2011.html小码哥小码哥Wed, 11 May 2011 14:26:00 GMThttp://www.blogjava.net/canvas/archive/2011/05/11/mark2011.htmlhttp://www.blogjava.net/canvas/comments/350041.htmlhttp://www.blogjava.net/canvas/archive/2011/05/11/mark2011.html#Feedback1http://www.blogjava.net/canvas/comments/commentRss/350041.htmlhttp://www.blogjava.net/canvas/services/trackbacks/350041.html
好久都没有做总结了，好久都没有做什么项目了，整天忙着上课，读论文，最近一段时间还开始忙着谈恋爱了。

2011年开始这几个月读了数篇readings in database systems中超牛们的论文，对关系数据库知识也有了一定了解，而不是停留在以前仅仅会用关系数据库那个层次上了。还读了simpledb的源代码，minibase的源代码没有读完，也不想读了，很没意思，Jim Gray大神说关系数据库没啥搞头了，我觉得也是。Stonebraker大神也搞出了scidb，不搞传统的关系数据库了。

好吧，我也不搞关系数据库了，开始跟进scidb吧。no-sql，not only-sql。我来了。



小码哥 2011-05-11 22:26 发表评论
]]>小记盛大校园牛人创新技术大赛http://www.blogjava.net/canvas/archive/2010/09/18/snda.html小码哥小码哥Sat, 18 Sep 2010 09:13:00 GMThttp://www.blogjava.net/canvas/archive/2010/09/18/snda.htmlhttp://www.blogjava.net/canvas/comments/332388.htmlhttp://www.blogjava.net/canvas/archive/2010/09/18/snda.html#Feedback0http://www.blogjava.net/canvas/comments/commentRss/332388.htmlhttp://www.blogjava.net/canvas/services/trackbacks/332388.html阅读全文

小码哥 2010-09-18 17:13 发表评论
]]>删除Firefox地址栏下拉列表中的指定记录http://www.blogjava.net/canvas/archive/2010/01/11/del-firefox-address.html小码哥小码哥Mon, 11 Jan 2010 08:31:00 GMThttp://www.blogjava.net/canvas/archive/2010/01/11/del-firefox-address.htmlhttp://www.blogjava.net/canvas/comments/309038.htmlhttp://www.blogjava.net/canvas/archive/2010/01/11/del-firefox-address.html#Feedback0http://www.blogjava.net/canvas/comments/commentRss/309038.htmlhttp://www.blogjava.net/canvas/services/trackbacks/309038.html原因很简单，我要删掉删除Firefox地址栏下拉列表中指定的几条记录，试了del、alt+del、shift+del、ctrl+del都不管用
才发现这些记录都已经是书签了，于是选择:书签-->管理书签-->在搜索书签栏里面输入要删除的网址，找到删除即可  阅读全文

小码哥 2010-01-11 16:31 发表评论
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