一、构建基本的实验环境1.1基本实验环境与前提条件Windows7 、Word 2010、Vmware WorkStation 8.5、AdobeReaderReadHatLinux 9.0，gcc，viLinux内核[V2.4.18]1.2虚拟机的安装及使用1.3将Linux 内核源代码及配置文件传送给虚拟机上的Red Hat Linux V9.0 系统配置网络时遇到这个问题，Determining IP information for eth0... failed; no link present. Check cable？通过查找资料发现是系统的Bug，解决方法如下：到/etc/sysconfig/network-scripts/ifcfg-eth0在文件最后一行中加入check_link_down () {return 1;}另外如果存在/etc/sysconfig/networking/profiles/default/ifcfg-eth0 文件，则同样在其中加入这一段东西即可，然后重启系统。

设置网络为DHCP，重新启动就可以，啦，直接上图最后将内核代码下载到/root目录下二、Linux 内核编译、配置与调试2.1 内核配置与编译2.1.1、解压内核源代码文件tar -zxf linux-2.4.18.tar.gz2.1.2、解压后如下2.1.3、拷贝linux，命名为linux-2.4.18cp -r linux linux-2.4.182.1.4、移动config-2.4.18forMP.txt到linux-2.4.18根目录，替换掉.config2.1.5、进入linux-2.4.18目录，配置和编译内核模块make oldconfigmake depmake cleanmake bzImagemake modules2.2 内核安装与测试2.2.1安装内核映像文件cp arch/i386/boot/bzImage /boot/vmlinux-2.4.182.2.2拷贝和安装Linux系统映射文件System.map,并创建其与系统映射文件System.map之间的符号链接2.2.3执行命令make modules_install 以安装可动态加载的内核模块2.2.4添加启动项的配置利用vi编辑器，vi grub.conf查看/ 所在的位置，为/dev/sda32.2.5reboot重新启动系统，从自己创建的内核启动系统启动后查看内核分别用uname –r，和dmesg查看三、Linux 系统调用添加与实现3.1 在内核增加系统调用3.1.1结构体struct srz_rusage可声明如下：.struct srz_rusage {struct timeval ru_utime; /* user time used */struct timeval ru_stime; /* system time used */long ru_majflt; /* major page faults */long ru_minflt; /* minor page faults */long ru_nswap; /* swaps */};3.1.2添加到linux-2.4.18/include/linux下的resource.h中3.1.3添加的系统调用名称为：int get_process_usage(pid_t, struct srz_rusage*);参考的getrusage和sys_getrusage的代码在linux-2.4.18/linux/kernel/sys.c下面3.1.4分析getrusage()和sys_getrusage()的源代码1)数据结构rusage 在头文件resource.h中定义。

struct rusage {struct timeval ru_utime; /* user time used */struct timeval ru_stime; /* system time used */long r u_maxrss; /* maximum resident set size */long r u_ixrss; /* integral shared memory size */long r u_idrss; /* integral unshared data size */long r u_isrss; /* integral unshared stack size */long r u_minflt; /* page reclaims */long r u_majflt; /* page faults */long r u_nswap; /* swaps */long r u_inblock; /* block input operations */long r u_oublock; /* block output operations */long r u_msgsnd; /* messages sent */long r u_msgrcv; /* messages received */long r u_nsignals; /* signals received */long r u_nvcsw; /* voluntary context switches */long r u_nivcsw; /* involuntary " */};2)函数getrusage()的作用是获取系统资源使用情况。

/** It would make sense to put struct rusage in the task_struct,* except that would make the task_struct be *really big*. After* task_struct gets moved into malloc'ed memory, it would* make sense to do this. It will make moving the rest of the information* a lot simpler! (Which we're not doing right now because we're not* measuring them yet).** This is SMP safe. Either we are called from sys_getrusage on ourselves* below (we know we aren't going to exit/disappear and only we change our* rusage counters), or we are called from wait4() on a process which is* either stopped or zombied. In the zombied case the task won't get* reaped till shortly after the call to getrusage(), in both cases the* task being examined is in a frozen state so the counters won't change.** FIXME! Get the fault counts properly!*/int getrusage(struct task_struct *p, int who, struct rusage *ru){struct rusage r;memset((char *) &r, 0, sizeof(r));switch (who) {case RUSAGE_SELF:r.ru__sec = CT_TO_SECS(p->times.tms_utime);r.ru__usec = CT_TO_USECS(p->times.tms_utime);r.ru__sec = CT_TO_SECS(p->times.tms_stime);r.ru__usec = CT_TO_USECS(p->times.tms_stime);r.ru_minflt = p->min_flt;r.ru_majflt = p->maj_flt;r.ru_nswap = p->nswap;break;case RUSAGE_CHILDREN:r.ru__sec = CT_TO_SECS(p->times.tms_cutime);r.ru__usec = CT_TO_USECS(p->times.tms_cutime);r.ru__sec = CT_TO_SECS(p->times.tms_cstime);r.ru__usec = CT_TO_USECS(p->times.tms_cstime);r.ru_minflt = p->cmin_flt;r.ru_majflt = p->cmaj_flt;r.ru_nswap = p->cnswap;break;default:r.ru__sec = CT_TO_SECS(p->times.tms_utime + p->times.tms_cutime);r.ru__usec = CT_TO_USECS(p->times.tms_utime +p->times.tms_cutime);r.ru__sec = CT_TO_SECS(p->times.tms_stime + p->times.tms_cstime);r.ru__usec = CT_TO_USECS(p->times.tms_stime + p->times.tms_cstime);r.ru_minflt = p->min_flt + p->cmin_flt;r.ru_majflt = p->maj_flt + p->cmaj_flt;r.ru_nswap = p->nswap + p->cnswap;break;}return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;}3)sys_getrusage()只是调用了内核函数getrusage()，是内核提供给用户的接口。