有关虚拟存储区的知识
"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
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