log0files_capacity.h File Reference

Redo log management of capacity. More...

#include "log0files_dict.h"
#include "log0types.h"
#include "os0file.h"

Go to the source code of this file.

Classes
class	Log_files_capacity
	Responsible for the redo log capacity computations. More...
struct	Log_files_capacity::Exposed

Functions
void	log_files_capacity_get_limits (const log_t &log, lsn_t &limit_for_free_check, lsn_t &limit_for_dirty_page_age)
	Retrieves limitations determined by the current state of log.m_capacity. More...

Detailed Description

Redo log management of capacity.

Function Documentation

log_files_capacity_get_limits()

void log_files_capacity_get_limits	(	const log_t &	log,
		lsn_t &	limit_for_free_check,
		lsn_t &	limit_for_dirty_page_age
	)

Retrieves limitations determined by the current state of log.m_capacity.

These values are retrieved atomically (are consistent with each other).

Parameters

[in]	log	redo log
[out]	limit_for_free_check	soft capacity of the redo decreased by the current free check margin; this is limit for size of redo until which the log_free_check calls do not force waits
[out]	limit_for_dirty_page_age	limit for the oldest dirty page until which the async (adaptive) flushing is not forced to be started (it might be started if turned on explicitly by the innodb_adaptive_flushing); note that computation of this value include doing the subtraction of the current log free check margin