mastering instructional design process

Course Description:Python data analysis from getting started to mastering video tutorial instructional Videos----------------------Course Catalogue------------------------------Python Data Analysis ChapterThe first part. Python Basics Lesson One: Overview of Python--python basic introduction, installation and basic syntax, variable types and operatorsLesson Two: Understanding Python

area. Possible signs are Prot_read, Prot_write, Prot_exec and Prot_none. The first 3 marks are the same as those of the Mark Vm_read, Vm_write and Vm_exec. Prot_none indicates that the process does not have any of the above 3 access rights. flag: This parameter specifies additional flags for the virtual area. The function calls the Do_mmap_pgoff () function, which does the main work of memory mapping, the function is longer, detailed implementation c

the portion of the file to be mapped.Addr: An address in a virtual space that represents a virtual area where a spare is located from this address.Prot: This parameter specifies access rights to the pages included in the virtual area. Possible signs are Prot_read, Prot_write, Prot_exec and Prot_none. The first 3 marks are the same as those of the Mark Vm_read, Vm_write and Vm_exec. Prot_none indicates that the process does not have any of the above 3

WLAN from getting started to mastering-Basic article "phase 8th--sta Access process "WLAN from getting started to mastering-Basic article" phase 8th--sta Access Process The last period and everyone to share the fit AP on the AC on-line process, in fact, whether the fa

"Copyright Notice: respect for the original, reproduced please retain the source: blog.csdn.net/shallnet, the article only for learning Exchange, do not use for commercial purposes"This column analyzes the design implementation of the Linux kernel, including system calls, interrupts, the lower half of the mechanism, time management, kernel synchronization, process management, memory management and other rel

about three lower-half mechanisms: soft interrupts, Tasklet, and task queues. Where Tasklet is based on soft interrupts, and the work queue is implemented by kernel threads. The use of soft interrupts must ensure the security of shared data, as soft interrupts of the same class may be performed concurrently on different processors. Consider using soft interrupts, such as network subsystems, in applications where time requirements are stringent and high frequency of execution, or if you are read

(Timeout when the timer expires, the Process_timeout () function is called:static void Process_timeout (unsigned long __data) { wake_up_process (struct task_struct *) __data);}When the task is re-dispatched, the return code will continue to be executed before it enters sleep, at exactly schedule (). code for the process context to wait for a specific time to occur, you can put yourself in the waiting queue. However, waiting for a task on the queue

long flags;trace_kfree (_ret_ip_, OBJP); if (Unlikely (zero_ Or_null_ptr (OBJP)) Return;local_irq_save (Flags) Kfree_debugcheck (OBJP); c = Virt_to_cache (OBJP);d Ebug_check_no_ Locks_freed (OBJP, Obj_size (c));d Ebug_check_no_obj_freed (OBJP, Obj_size (c)); __cache_free (c, (void *) OBJP); Local_irq _restore (flags);}Finally, in conjunction with the previous section,look at the selection of the allocation function:If you need a contiguous physical page, you can use a low-level page allocator o

(); Account_system_vtime (current); _local_bh_enable ();}The use of soft interrupts must be statically registered during compilation, generally only like the network of high performance requirements for the use of soft interrupts, the article before we also see that the system registered soft interrupt just a few. Most of the time, using the second half of another mechanism tasklet more, Tasklet can be dynamically registered and can be seen as a product of balancing performance and usability

also ensure that "excessive" soft interrupt will eventually be processed. Finally, on idle systems, this scheme also behaves well and soft interrupts are handled very quickly (because the memory threads that are stored are bound to be dispatched immediately). To ensure that as long as there are idle processors, they handle soft interrupts, so each processor is assigned one such thread. The names of all the threads are called ksoftirad/n, the difference being N, which corresponds to the number o

):def __init__(self): Self.name='Processserver'self.state=state.newdefboot (self):Print('booting the {}'. Format ( self) self.state=state.runningdefKill (Self, restart=True):Print('killing {}'. Format ( self) self.state= Stae.restartifRestartElseState.zobmiedefcreate_process (self, user, name):Print("trying to create process ' {} ' for user ' {} '". Format (name, user)classWindowsServer:PassclassNetworkserver:PassclassOperatingSystem:def __init__(self