http://kernel.taobao.org/index.php?title=Kernel_Documents/mm_sysctl min_free_kbytes 先看官方解释:This is used to force the Linux VM to keep a minimum number of kilobytes free. The VM uses this number to compute a watermark[WMARK_MIN] value for each lowmem…
min_free_kbytes 内存域水印值:min_free_kbytes 当不设置的时候:sqrt(16M)=4k 4k*4 = 16k 设置内存水印值的函数是: 6792 /* 6793 * Initialise min_free_kbytes. 6794 * 6795 * For small machines we want it small (128k min). For large machinemis 6796 * we want it large (64MB max). But…
1. min_free_kbytes 先看官方解释: This is used to force the Linux VM to keep a minimum number of kilobytes free. The VM uses this number to compute a watermark[WMARK_MIN] value for each lowmem zone in the system. Each lowmem zone gets a number of reserved f…
内核参数:内存相关 内存管理从三个层次管理内存,分别是node, zone ,page; 64位的x86物理机内存从高地址到低地址分为: Normal DMA32 DMA.随着地址降低. [root@localhost01 /home/ahao.mah] #cat /proc/zoneinfo |grep "Node" Node 0, zone DMA Node 0, zone DMA32 Node 0, zone Normal Node 1, zone Normal 每个zone都有…
1. min_free_kbytes 先看官方解释: This is used to force the Linux VM to keep a minimum number of kilobytes free. The VM uses this number to compute a watermark[WMARK_MIN] value for each lowmem zone in the system. Each lowmem zone gets a number of reserved f…
1.内存域水印值:需要为关键性分配保留的内存空间的最小值:该值保存在全局变量min_free_kbytes中 2.内存域水印值的计算由函数init_per_zone_pages_min完成: /* * Initialise min_free_kbytes. * * For small machines we want it small (128k min). For large machines * we want it large (64MB max). But it is not linea…
