错误：“struct task_struct”没有名为“it_virt_value”的成员

Question

我正在尝试在Linux ubuntu-studio中创建一个系统调用，它具有以下功能：

带来虚拟内存更大的进程和它所占用的字节数。

下面是系统调用的实现代码：

#include <linux/module.h>
#include <linux/printk.h>
#include <linux/sched.h>

struct pid_size{
    int pid;
    unsigned long size;
};


struct pid_size pid maiorMemoriaVirtual(void)
{
    struct task_struct *task;
    struct task_struct *maior = NULL;

    for_each_process(task)
    {
        if(maior == NULL)
            maior = task; 
        else if(task->it_virt_value > maior->it_virt_value)
            maior = task;
    }

    struct pid_size retorno;
    retorno.pid = maior->pid;
    retorno.size = maior->it_virt_value;

    return retorno;
}

当编译尝试编译内核时，得到以下错误：

kernel/maiorMemoriaVirtual.c: In function ‘sys_maiorMemoriaVirtual’:
kernel/maiorMemoriaVirtual.c:19:21: error: ‘struct task_struct’ has no member named ‘it_virt_value’
         else if(task->it_virt_value > maior->it_virt_value)
                     ^
kernel/maiorMemoriaVirtual.c:19:44: error: ‘struct task_struct’ has no member named ‘it_virt_value’
         else if(task->it_virt_value > maior->it_virt_value)
                                            ^
kernel/maiorMemoriaVirtual.c:23:5: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
     struct pid_size retorno;
     ^
kernel/maiorMemoriaVirtual.c:25:25: error: ‘struct task_struct’ has no member named ‘it_virt_value’
     retorno.size = maior->it_virt_value;
                         ^
make[1]: ** [kernel/maiorMemoriaVirtual.o] Erro 1

Answer 1

我在做作业时遇到了类似的问题，我意识到“task_struct”结构的定义有相当多的变化。

我的猜测是，您正在查找累积的虚拟内存使用情况。你可能会发现这个链接很有用。Accumulated Virtual Memory usage

Link to the task_struct definition in kernel 2.6.36