centos 系统调用overhead
大家好！ 本人刚刚接触linux内核开发，想在内核中添加几个系统调用，内核的版本为2.6.32.63。在网上搜了一下类似于教程的博文，照着上面的方法实验了一下，可是每次编译内核的时候总是警告： syscall ***** not implemented。一开始以为是我没有严格按照教程上说的将系统调用的服务例程放到kernel/sys.c里面去实现，而是将他放到了ppp_generic.c里面。后来我去查看了内核中的sys_perf_event_open系统调用的实现，发现它也是放...
by romandoooo - Linux新手园地 - 2014-07-24 16:29:32 阅读（995） 回复（0）
求助，最近研究inl、outl系统调用，使用gdb调试时候，发现一个问题； 同样的inl函数声明： static inline unsigned int inl(int port) { unsigned int value; __asm__ __volatile__("in" "l" " %w1, %" "0" : "=a"(value) : "Nd"(port)); return value; } 在centos6.2上单步执行，执行到inl函数里的汇编代码如下： __asm__ __volatile__("in" "l" " %w1, %" "0" : "=a"(value) : "Nd"(port)); 但是在c...
After adding new web nodes for the launch of our plugin directory, we started seeing performance problems with our MongoDB database cluster. The symptom was increased response times in the main web app and using mongostat we were able to see this was being caused by queue spikes in MongoDB as queries were backing up waiting to get executed. We spent several days optimising queries and even the se...
Due to file system overhead, the largest file size that can be created is approximately 866 Gbytes.
Due to file system overhead, the largest file size that can be created\r\nis approximately 866 Gbytes.
有谁知道在cisco cat4006上这两个进程是什么意思，为什么占用CPU资源这么大？ s4006>;(enable) show proc cpu 98 269272113 126951344 9154 21.02% 22.11% 21.54% 0 Switching overhead 99 128291423 151429996 24659 2.05% 2.15% 2.14% 0 Admin overhead
有谁知道在cisco cat4006上这两个进程是什么意思，为什么占用CPU资源这么大？\r\ns4006>;(enable) show proc cpu\r\n98 269272113 126951344 9154 21.02% 22.11% 21.54% 0 Switching overhead\r\n99 128291423 151429996 24659 2.05% 2.15% 2.14% 0 Admin overhead
