"nr_dirty",
"nr_writeback",
"nr_unstable",
"nr_page_table_pages",
"nr_mapped",
"nr_slab",

"pgpgin",
"pgpgout",
"pswpin",
"pswpout",
"pgalloc_high",

"pgalloc_normal",
"pgalloc_dma",
"pgfree",
"pgactivate",
"pgdeactivate",

"pgfault",
"pgmajfault",
"pgrefill_high",
"pgrefill_normal",
"pgrefill_dma",

"pgsteal_high",
"pgsteal_normal",
"pgsteal_dma",
"pgscan_kswapd_high",
"pgscan_kswapd_normal",

"pgscan_kswapd_dma",
"pgscan_direct_high",
"pgscan_direct_normal",
"pgscan_direct_dma",
"pginodesteal",

"slabs_scanned",
"kswapd_steal",
"kswapd_inodesteal",
"pageoutrun",
"allocstall",

"pgrotated",
以上这些项是/proc/vmstat中的内容，我想知道她们都代表什么意思！请各位高手说明！谢谢　　　　　　

页交换信息，标志
pgalloc_normal",
"pgalloc_dma",
"pgfree",
"pgactivate",
"pgdeactivate",
分配page的类型
释放page的次数

等等，都是关于内存的现状，使用情况的一些参数