函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\io_uring.c Create Date:2022-07-29 10:55:05
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：io_sq_thread

函数原型：static int io_sq_thread(void *data)

返回类型：int

参数：

类型参数名称
void *data
3855  ctx等于data
3856  struct mm_struct * cur_mm = NULL
3859  DEFINE_WAIT(wait)
3864  mplete: - signals a single thread waiting on this completion*@x: holds the state of this particular completion* This will wake up a single thread waiting on this completion. Threads will be* awakened in the same order in which they were queued.
3866  old_fs等于获取当前进程地址空间上限()
3867  设置寄存器值(fs)
3868  old_cred等于verride_creds - Override the current process's subjective credentials*@new: The credentials to be assigned* Install a set of temporary override subjective credentials on the current* process, returning the old set for later reversion.
3870  ret等于timeout等于inflight等于0
3871  当非kthread_should_park - should this kthread park now?* When someone calls kthread_park() on your kthread, it will be woken* and this will return true循环
3874  如果inflight则
3875  nr_events等于0
3877  如果flags按位与_context is polled 则
3892  否则
3897  nr_events等于inflight
3900  inflight减等于nr_events
3901  如果非inflight则timeout等于jiffies加sq_thread_idle
3905  to_submit等于io_sqring_entries(ctx)
3911  如果非to_submit或ret恒等于负EBUSY则
3918  如果cur_mm则
3931  如果inflight或非These inlines deal with timer wrapping correctly. You are * strongly encouraged to use them* 1. Because people otherwise forget* 2. Because if the timer wrap changes in future you won't have to* alter your driver code.(jiffies, timeout)且ret不等于负EBUSY且非percpu_ref_is_dying - test whether a percpu refcount is dying or dead*@ref: percpu_ref to test* Returns %true if @ref is dying or dead.* This function is safe to call as long as @ref is between init and exit则
3934  cond_resched()
3935  继续下一循环
3938  Note: we use "set_current_state()" _after_ the wait-queue add,* because we need a memory barrier there on SMP, so that any* wake-function that tests for the wait-queue being active* will be guaranteed to see waitqueue addition _or_ subsequent
3942  Runtime flags* Written by the kernel, shouldn't be modified by the* application.* The application needs a full memory barrier before checking* for IORING_SQ_NEED_WAKEUP after updating the sq tail.或等于ds io_uring_enter wakeup
3944  smp_mb()
3946  to_submit等于io_sqring_entries(ctx)
3947  如果非to_submit或ret恒等于负EBUSY则
3960  sh_wait - clean up after waiting in a queue*@wq_head: waitqueue waited on*@wq_entry: wait descriptor* Sets current thread back to running state and removes* the wait descriptor from the given waitqueue if still* queued.
3962  Runtime flags* Written by the kernel, shouldn't be modified by the* application.* The application needs a full memory barrier before checking* for IORING_SQ_NEED_WAKEUP after updating the sq tail.与等于ds io_uring_enter wakeup 的反
3965  to_submit等于两数取小(to_submit, sq_entries)
3966  mutex_lock( & uring_lock)
3967  ret等于io_submit_sqes(ctx, to_submit, NULL, - 1, & cur_mm, true)
3968  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
3969  如果ret大于0则inflight加等于ret
3973  设置寄存器值(fs)
3974  如果cur_mm则
3975  unuse_mm(cur_mm)
3976  Decrement the use count and release all resources for an mm.
3978  vert_creds - Revert a temporary subjective credentials override*@old: The credentials to be restored* Revert a temporary set of override subjective credentials to an old set,* discarding the override set.
3980  kthread_parkme()
3982  返回:0