ni linux rt

PID Process NumberUser usernamePR-PriorityNI nice value. Negative values indicate high priority, positive values indicate low priorityThe amount of physical memory not swapped out by the RES process, in kilobytesS Process Status:D non-disruptive sleep stateR Run StatusS SleepT Track/StopZ Zombie Process%CPU CPU UsagePercentage of physical memory used by the%MEM processTotal CPU time used by the time+ process, Unit 1/100 secCommand execution commandsReference: http://blog.csdn.net/lxpbs8851/artic

Tags: 6.2 efault explanation Modify interrupt a process scheduling algorithm JPG AACWhy do you have a process priority?This does not seem to explain too much, after all, since the birth of a multitasking operating system, the ability of the process to execute CPU is a matter that must be artificially controlled. Because some processes are relatively important, some processes are less important.The way the process priority works has been largely unchanged since the invention, whether it is a sing

Process priority of 1.PRI, most systems (Linux, ucosii) are the lower the number of priority, the higher the process will run, the PRI (new) = PRI (old) and Nice in Linux, where the PRI (old) is determined by the system algorithm, Created with different values, the user cannot be modified , and the user can only modify the priority of the process by modifying niceNice, 2.

The problem of Vanilla kernel Linux kernel cannot be preempted in spinlock, IRQ contexts, so the time that a high-priority task wakes up to execution cannot be completely determined. Also, the Linux kernel itself does not handle priority inversion. Rt-preempt Patch is based on the Linux community kernel, plus the asso

1. Origin of SpinlockSpin Lock: An Access Protection lock on a shared resource, which uses a "spin" loop to wait for a mutex to be acquired.在Linux中，有多套spinlock操作接口。但是，实现机制并不相同。根据使用场景，实现机制可能是“自旋“，也可能不是”自旋”方式。这些实现机制的共通特点是：以不产生调度的方式，获取互斥锁。但是，在实时Linux(RtLinux)中，spinlock却是产生调度的。2. Spinlock usespinlock的不产生调度机制决定了用途：1、对共享数据的访问操作时间一定要短。不同系统对实时性要求不同，这个时间要求有差异，应该控制在5us以内。2、spinlock接口性能较高，适用在高频繁使用，但是冲突又少的场景。3、spinlock

Learn about Linux, please refer to the book "Linux should Learn" The birth of the 2012 Surface RT tablet is a tragic product, based on the ARM architecture running Windows RT operating system, but incompatible with the x86 environment, resulting in product and market positioning confusion, consumers ar

When I used bcp to back up data yesterday, the following error is always prompted and only several large tables can be exported at a time. This made me very strange that I failed to try it several times in a row. 00: 00000: 00053: 2007/07/23 09:07:14. 25 kernel cannot send, host process disconnected: Linux 15871 SUID: 100: 00000: 00056: 2007/07/23 09:07:14. 37 kernel cannot send, host process disconnected: Linux