读写操作之间的联系是一件不太好做的事情,原因其实就是Grace period(宽限期),内核中的做法[1]非常优雅,不但简单,直观,而且对用户代码的侵入性也很低,其在rcu_read_lock和rcu_read_unlock接口中分别关开中断,这样使得读操作临界区中不发生上下文切换,这样对于写操作来说,只要每个核都经历过一次上下文切换就可以退...
tid %lu\n","reader",urcu_get_thread_id());// 执行时加上-v 就可以显示出来,看做printf就可以set_affinity();// 修改CPU亲和性,默认关闭,使用use_affinity控制rcu_register_thread();// 将自己挂接在全局链表registry上,执行读操作必须调用这个assert(rcu_read_ongoing());rcu_...
(4).编译 [root@localhost userspace-rcu]# make Making all in include make[1]: Entering directory `/home/userspace-rcu/include' (CDPATH="${ZSH_VERSION+.}:" && cd .. && /bin/sh /home/userspace-rcu/config/missing --run autoheader) rm -f stamp-h1 touch config.h.in cd .. && /...
可以不改动应用程序代码,通过编译选项RCU_MEMBARRIER,RCU_SIGNAL,RCU_MB在这三个中切换。 从下面代码可以看到 // include/urcu.h #if !defined(RCU_MEMBARRIER) && !defined(RCU_SIGNAL) && !defined(RCU_MB) #define RCU_MEMBARRIER #endif #ifdef RCU_MEMBARRIER #include <urcu/urcu-memb.h> #elif def...
The APIs provided by Userspace RCU are, by prefix: rcu_: Read-Copy Update (see doc/rcu-api.md) cmm_: Concurrent Memory Model caa_: Concurrent Architecture Abstraction cds_: Concurrent Data Structures (see doc/cds-api.md) uatomic_: Userspace Atomic (see doc/uatomic-api.md) Quick start...
User-space RCU: Memory-barrier menagerie [LWN.net] file:///C:/Users/John/Desktop/内存/User-space RCU Memory-barrier menagerie [LWN... Weekly edition Archives Kernel Calendar Security Subscribe Distributions Write for LWN Contact Us LWN.net FAQ Search Sponsors User-space RCU: Memory-barrier mena...
Userspace RCU API by Mathieu Desnoyers and Paul E. McKenney API void rcu_init(void); This must be called before any of the following functions are invoked. void rcu_read_lock(void); Begin an RCU read-side critical section. These critical sections may be nested. void rcu_read_unlock(void...
The APIs provided by Userspace RCU are, by prefix: rcu_: Read-Copy Update (see doc/rcu-api.md) cmm_: Concurrent Memory Model caa_: Concurrent Architecture Abstraction cds_: Concurrent Data Structures (see doc/cds-api.md) uatomic_: Userspace Atomic (see doc/uatomic-api.md) Quick start...
2023-02-14 Userspace RCU 0.14.0 * Fix: urcu-bp: only teardown call-rcu worker in destructor * Fix: rculfhash: urcu_die() takes positive error value * Fix: call_rcu: teardown default call_rcu worker on application exit * Fix: join worker thread in call_rcu_data_free ...
LLTng的一些介绍 low-overhead, creation of local atomic operations in the linux kernel 与Ftrace的一些对比 RCU for data structure 其中的一个buffer使用强烈依赖于X86的TSO, ARM不友好!!! eBPF an aggregator. The eBPF interpreter provides data structures to its users, such as simple arrays and hashma...