docs/zh_CN: Update zh_CN/accounting/delay-accounting.rst
Update zh_CN/accounting/delay-accounting.rst. The document modification has been merged which refers to the following link: https://lore.kernel.org/all/1639583021-92977-1-git-send-email-wang.yong12@zte.com.cn/ Signed-off-by: wangyong <wang.yong12@zte.com.cn> Reviewed-by: Yang Yang <yang.yang29@zte.com.cn> Reviewed-by: Alex Shi <alexs@kernel.org> Link: https://lore.kernel.org/r/1642003482-48935-1-git-send-email-wang.yong12@zte.com.cn Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -17,6 +17,8 @@ a) 等待一个CPU(任务为可运行)
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b) 完成由该任务发起的块I/O同步请求
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c) 页面交换
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d) 内存回收
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e) 页缓存抖动
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f) 直接规整
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并将这些统计信息通过taskstats接口提供给用户空间。
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@ -37,10 +39,10 @@ d) 内存回收
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向用户态返回一个通用数据结构,对应每pid或每tgid的统计信息。延时计数功能填写
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该数据结构的特定字段。见
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include/linux/taskstats.h
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include/uapi/linux/taskstats.h
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其描述了延时计数相关字段。系统通常以计数器形式返回 CPU、同步块 I/O、交换、内存
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回收等的累积延时。
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回收、页缓存抖动、直接规整等的累积延时。
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取任务某计数器两个连续读数的差值,将得到任务在该时间间隔内等待对应资源的总延时。
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@ -72,40 +74,36 @@ kernel.task_delayacct进行开关。注意,只有在启用延时计数后启
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getdelays命令的一般格式::
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getdelays [-t tgid] [-p pid] [-c cmd...]
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getdelays [-dilv] [-t tgid] [-p pid]
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获取pid为10的任务从系统启动后的延时信息::
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# ./getdelays -p 10
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# ./getdelays -d -p 10
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(输出信息和下例相似)
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获取所有tgid为5的任务从系统启动后的总延时信息::
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# ./getdelays -t 5
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# ./getdelays -d -t 5
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print delayacct stats ON
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TGID 5
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CPU count real total virtual total delay total
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7876 92005750 100000000 24001500
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IO count delay total
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0 0
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SWAP count delay total
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0 0
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RECLAIM count delay total
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0 0
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CPU count real total virtual total delay total delay average
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8 7000000 6872122 3382277 0.423ms
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IO count delay total delay average
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0 0 0ms
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SWAP count delay total delay average
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0 0 0ms
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RECLAIM count delay total delay average
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0 0 0ms
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THRASHING count delay total delay average
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0 0 0ms
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COMPACT count delay total delay average
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0 0 0ms
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获取指定简单命令运行时的延时信息::
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获取pid为1的IO计数,它只和-p一起使用::
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# ./getdelays -i -p 1
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printing IO accounting
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linuxrc: read=65536, write=0, cancelled_write=0
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# ./getdelays -c ls /
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bin data1 data3 data5 dev home media opt root srv sys usr
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boot data2 data4 data6 etc lib mnt proc sbin subdomain tmp var
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CPU count real total virtual total delay total
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6 4000250 4000000 0
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IO count delay total
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0 0
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SWAP count delay total
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0 0
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RECLAIM count delay total
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0 0
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上面的命令与-v一起使用,可以获取更多调试信息。
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