2/28/2023 0 Comments Linux see process timeslice![]() Idle A program running with idle io priority will only get disk time when no other program has asked for disk io for a defined grace period. Or just -p is given, ionice will query the current io scheduling class and priority for that process.Īs of this writing, a process can be in one of three scheduling classes: * * The type inconsistency of the wait_event_*() _ret variable is also * on purpose we use long where we can return timeout values and int * otherwise.This program sets or gets the io scheduling class and priority for a program. * * This is so that both can use the _wait_cond_timeout() construct * to wrap the condition. Static _always_inline struct rq * context_switch ( struct rq * rq, struct task_struct * prev, struct task_struct * next, struct rq_flags * rf ) while (0) #define _wait_event(wq_head, condition) \ (void)_wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ schedule()) /* * The below macro _wait_event() has an explicit shadow of the _ret * variable when used from the wait_event_*() macros. Point to that new namespace instead of the default one. Is created a new net namespace is created and then new processes can System initializes with a default namespace ( init_net) and byĭefault all processes will share this namespace. Networking interfaces, the list is part of a struct net. For example, instead of having a global list for ItĬurrently supports IPC, networking, cgroup, mount, networking, PID, Is used to group types of resources that we want to partition. To achieve this partitioning, the struct nsproxy structure With containers, processes in oneĬontainer will not be visible (in /proc or be killable) to other ![]() ![]() They allow isolation of different resources that would Lightweight "VM" and docker - a specialized container for running aĬontainers are built on top of a few kernel features, one of which is Hypervisor runs multiple VMs, each with its one kernelĮxamples of container technologies are LXC - that allows running Same kernel instance, as opposed to normal virtualization where a "Containers" are a form of lightweight virtual machines that share the They will point to different resource structure instances. If two threads are in different processes Thus, if two threads are the same process will point to the same Task structure it has pointers to these resources. The basic unit isĬalled a task (hence the struct task_struct) and it is usedįor both tasks and processes. Linux uses a different implementation for threads. For example, the Windows kernel uses such an Implemented as a separate data structure which is then linked to the The typical thread implementation is one where the threads is fibers, coroutines, etc.) are not visible at the kernel level
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