函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\linux\blk-cgroup.h Create Date:2022-07-27 06:56:16
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：blk_cgroup_congested

函数原型：static inline bool blk_cgroup_congested(void)

返回类型：bool

参数：无

281  bool ret = false
283  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
284  css等于kthread_blkcg - get associated blkcg css of current kthread* Current thread must be a kthread.
285  如果非css则css等于循环获得css
287  当css循环
288  如果atomic_read( & If there is block congestion on this cgroup. )则
289  ret = true
290  退出
292  css等于PI: the parent css. Placed here for cache proximity to following* fields of the containing structure.
294  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
295  返回:ret
调用者
名称描述
page_cache_sync_readaheadpage_cache_sync_readahead - generic file readahead*@mapping: address_space which holds the pagecache and I/O vectors*@ra: file_ra_state which holds the readahead state*@filp: passed on to ->readpage() and ->readpages()*@offset: start offset into @mapping,
page_cache_async_readaheadpage_cache_async_readahead - file readahead for marked pages*@mapping: address_space which holds the pagecache and I/O vectors*@ra: file_ra_state which holds the readahead state*@filp: passed on to ->readpage() and ->readpages()*@page: the page at @offset
mem_cgroup_throttle_swaprate