An estimate of how much memory is available for starting new applications, without swapping. Calculated from MemFree, SReclaimable, the size of the file LRU lists, and the low watermarks in each zone.

The estimate takes into account that the system needs some page cache to function well, and that not all reclaimable slab will be reclaimable, due to items being in use. The impact of those factors will vary from system to system.

https://blog.famzah.net/2014/09/24/memavailable-metric-for-linux-kernels-before-3-14-in-procmeminfo/


大概意思:

估算在准备启动一个新程序时所需要的可用内存的,不包括交换区。计算包括空闲内存,可回收内存,最近最少使用列表的大小以及每个内存分区中的低水平标记。

这种估算考虑到系统需要一些页面缓存给函数,不是所有可回收内存都能被回收,因为它们正在被使用着。面对这种情况,每个系统的处理都各不相同。