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Linux 内存分配/解除分配

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Linux 内存分配/解除分配

如果没有 ?该pgfree/s命令会发生吗pgscand/s？pgfree/s和 和 有什么区别pgscank/s？

答案1

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$ man sar

-B     Report paging statistics.  The following values are displayed:


          pgpgin/s
                 Total number of kilobytes the system paged in from disk per second.

          pgpgout/s
                 Total number of kilobytes the system paged out to disk per second.

          fault/s
                 Number of page faults (major + minor) made by the system per second.
                 This is not a count of page faults that generate I/O, because some page 
                 faults can be resolved without I/O.

          majflt/s
                 Number of major faults the system has made per second, those which have 
                 required loading a memory page from disk.

          pgfree/s
                 Number of pages placed on the free list by the system per second.

          pgscank/s
                 Number of pages scanned by the kswapd daemon per second.

          pgscand/s
                 Number of pages scanned directly per second.

答案2

有不同的“系统每秒”

有：

系统\文件读取操作/秒：是计算机上所有设备的文件系统读取请求的综合速率，包括从文件系统缓存读取的请求。

系统\文件写入操作/秒是对计算机上所有设备的文件系统写入请求的综合速率，

系统\系统正常运行时间是计算机自上次启动以来已运行的时间（以秒为单位）。

系统\系统调用/秒是计算机上运行的所有进程调用操作系统服务例程的综合速率。

这kswapd 守护进程如果列表上的页数变得太少，则扫描空闲列表中的可用页。该守护进程仅在需要时运行。

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