未找到DEADLINE调度策略

Question

我想在C中实现DEADLINE调度策略.我知道该功能已经实现,因为Linux 3.14.10我使用的Ubuntu 14.04 Linux #### 3.17.0-031700-lowlatency #201410060605 SMP PREEMPT已经足够了.我用Eclipse开发程序(作为sudo启动).

我已经定义_GNU_SOURCE和包含sched.h,我仍然无法使用关键字SCHED_DEADLINE,来定义struct sched_attr或使用像这样的函数sched_getattr.

#define _GNU_SOURCE
#include <sched.h>

我的/usr/include/文件夹中没有定义这些关键字和函数,但我已设法找到它们/usr/src/linux-headers-3.17.0-031700/include/.我试图在我的项目的构建选项中包含此文件夹,但它似乎生成链接错误.

我真的不习惯C开发(我原来是一个JS开发者)所以如果有人能解释我做错了什么以及如何解决这个问题,那将是非常好的.

内容 /usr/include/linux/sched.h

#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

/*
 * cloning flags:
 */
#define CSIGNAL     0x000000ff  /* signal mask to be sent at exit */
#define CLONE_VM    0x00000100  /* set if VM shared between processes */
#define CLONE_FS    0x00000200  /* set if fs info shared between processes */
#define CLONE_FILES 0x00000400  /* set if open files shared between processes */
#define CLONE_SIGHAND   0x00000800  /* set if signal handlers and blocked signals shared */
#define CLONE_PTRACE    0x00002000  /* set if we want to let tracing continue on the child too */
#define CLONE_VFORK 0x00004000  /* set if the parent wants the child to wake it up on mm_release */
#define CLONE_PARENT    0x00008000  /* set if we want to have the same parent as the cloner */
#define CLONE_THREAD    0x00010000  /* Same thread group? */
#define CLONE_NEWNS 0x00020000  /* New namespace group? */
#define CLONE_SYSVSEM   0x00040000  /* share system V SEM_UNDO semantics */
#define CLONE_SETTLS    0x00080000  /* create a new TLS for the child */
#define CLONE_PARENT_SETTID 0x00100000  /* set the TID in the parent */
#define CLONE_CHILD_CLEARTID    0x00200000  /* clear the TID in the child */
#define CLONE_DETACHED      0x00400000  /* Unused, ignored */
#define CLONE_UNTRACED      0x00800000  /* set if the tracing process can't force CLONE_PTRACE on this clone */
#define CLONE_CHILD_SETTID  0x01000000  /* set the TID in the child */
/* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
   and is now available for re-use. */
#define CLONE_NEWUTS        0x04000000  /* New utsname group? */
#define CLONE_NEWIPC        0x08000000  /* New ipcs */
#define CLONE_NEWUSER       0x10000000  /* New user namespace */
#define CLONE_NEWPID        0x20000000  /* New pid namespace */
#define CLONE_NEWNET        0x40000000  /* New network namespace */
#define CLONE_IO        0x80000000  /* Clone io context */

/*
 * Scheduling policies
 */
#define SCHED_NORMAL        0
#define SCHED_FIFO      1
#define SCHED_RR        2
#define SCHED_BATCH     3
/* SCHED_ISO: reserved but not implemented yet */
#define SCHED_IDLE      5
/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
#define SCHED_RESET_ON_FORK     0x40000000


#endif /* _LINUX_SCHED_H */

编辑

我想要的/usr/src/linux-headers-3.17.0-031700/include/文件位于该文件夹中.无论如何,我尝试使用几种方法将文件夹添加到我的项目中.首先使用-Igcc的标志,然后使用C_INCLUDE_PATH环境变量.

在两种方式中,gcc在默认位置优先搜索并找到错误的<sched.h>文件.我试图使用-nostdinc选项来抑制默认位置,但这更糟糕......我遇到了很多错误.

Answer 1

我实际上升级到了Ubuntu 16.04 LTSakernel 4.4.0-21-lowlatency并且关键字SCHED_DEADLINE现在是默认定义的。

问题是还没有struct sched_attr方法！sched_getattr() / sched_setattr()

经过一番研究（感谢 Google），我发现了内核开发人员发布的这篇文章。文档最后描述了如何使用截止时间调度策略。它们只是自行定义结构并用于syscallget/set 方法。