如何解决获取lvs的pids / locks-dmsetup信息上的opencount的来源
# dmsetup info
Name: ubuntu--vg-root
State: ACTIVE
Read Ahead: 256 <----
Tables present: LIVE
Open count: 1 <--- # how / from where are we getting this value
Event number: 0
Major,minor: 253,0
Number of targets: 1
UUID: LVM-cNOV7zcldgzsAuxUbXbSdk2WhT012Pjay1B0JmoKCcTFOQDa9u19bDkqkdceVY0a
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我想弄清楚dmsetup信息从何处获得计数,我真的很想弄清楚,运行了一个跟踪但无法分辨
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我也看到/ sys / dev / block / 253:0 / bdi / read_ahead_kb上的预读值128,但是dmsetup info显示256。这不是不一致的吗?我在这里想念什么吗?
open("/sys/dev/block/253:0/bdi/read_ahead_kb",O_RDONLY) = 4 read(4,"128\n",23) = 4 close(4) = 0 write(1,"Read Ahead: 256\n",23Read Ahead: 256 ) = 23 write(1,"Tables present: LIVE\n",24Tables present: LIVE ) = 24 write(1,"Open count: 1\n",21Open count: 1 ) = 21 write(1,"Event number: 0\n",21Event number: 0 ) = 21 write(1,"Major,0\n",26Major,0 ) = 26 write(1,"Number of targets: 1\n",21Number of targets: 1 ) = 21 write(1,"UUID: LVM-cNOV7zcldgzsAuxUbXbSdk"...,75UUID: LVM-cNOV7zcldgzsAuxUbXbSdk2WhT012Pjay1B0JmoKCcTFOQDa9u19bDkqkdceVY0a ) = 75 write(1,"\n",1 ) = 1
关闭(3)= 0 exit_group(0)=? +++以0退出+++ root @ dockserver:/ sys / dev / block / 253:0 / dm#cat / sys / dev / block / 253:0 / bdi / read_ahead_kb 128 root @ dockserver:/ sys / dev / block / 253:0 / dm#
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