函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\readahead.c Create Date:2022-07-27 15:35:47
Last Modify:2020-03-17 21:13:07 Copyright©Brick
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函数名称：Count contiguously cached pages from @offset-1 to @offset-@max,* this count is a conservative estimation of* - length of the sequential read sequence, or* - thrashing threshold in memory tight systems

函数原型：static unsigned long count_history_pages(struct address_space *mapping, unsigned long offset, unsigned long max)

返回类型：unsigned long

参数：

类型参数名称
struct address_space *mapping
unsigned longoffset
unsigned longmax
337  _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
338  head等于page_cache_prev_miss() - Find the previous gap in the page cache.*@mapping: Mapping.*@index: Index.*@max_scan: Maximum range to search.* Search the range [max(index - max_scan + 1, 0), index] for the* gap with the highest index.
339  _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()
341  返回:offset减1减head
调用者
名称描述
try_context_readaheadpage cache context based read-ahead