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Message-Id: <1642003482-48935-1-git-send-email-wang.yong12@zte.com.cn>
Date: Wed, 12 Jan 2022 08:04:42 -0800
From: yongw.pur@...il.com
To: alexs@...nel.org, siyanteng@...ngson.cn, corbet@....net,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
wang.yong12@....com.cn, yang.yang29@....com.cn
Subject: [PATCH] docs/zh_CN: Update zh_CN/accounting/delay-accounting.rst
From: wangyong <wang.yong12@....com.cn>
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@....com.cn>
Reviewed-by: Yang Yang <yang.yang29@....com.cn>
---
.../zh_CN/accounting/delay-accounting.rst | 62 +++++++++++-----------
1 file changed, 30 insertions(+), 32 deletions(-)
diff --git a/Documentation/translations/zh_CN/accounting/delay-accounting.rst b/Documentation/translations/zh_CN/accounting/delay-accounting.rst
index 67d5606..f184941 100644
--- a/Documentation/translations/zh_CN/accounting/delay-accounting.rst
+++ b/Documentation/translations/zh_CN/accounting/delay-accounting.rst
@@ -17,6 +17,8 @@ a) 等待一个CPU（任务为可运行）
b) 完成由该任务发起的块I/O同步请求
c) 页面交换
d) 内存回收
+e) 页缓存抖动
+f) 直接规整
并将这些统计信息通过taskstats接口提供给用户空间。
@@ -37,10 +39,10 @@ d) 内存回收
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
该数据结构的特定字段。见
- include/linux/taskstats.h
+ include/uapi/linux/taskstats.h
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
-回收等的累积延时。
+回收、页缓存抖动、直接规整等的累积延时。
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。
@@ -72,40 +74,36 @@ kernel.task_delayacct进行开关。注意，只有在启用延时计数后启
getdelays命令的一般格式::
- getdelays [-t tgid] [-p pid] [-c cmd...]
+ getdelays [-dilv] [-t tgid] [-p pid]
获取pid为10的任务从系统启动后的延时信息::
- # ./getdelays -p 10
+ # ./getdelays -d -p 10
（输出信息和下例相似）
获取所有tgid为5的任务从系统启动后的总延时信息::
- # ./getdelays -t 5
-
-
- CPU count real total virtual total delay total
- 7876 92005750 100000000 24001500
- IO count delay total
- 0 0
- SWAP count delay total
- 0 0
- RECLAIM count delay total
- 0 0
-
-获取指定简单命令运行时的延时信息::
-
- # ./getdelays -c ls /
-
- bin data1 data3 data5 dev home media opt root srv sys usr
- boot data2 data4 data6 etc lib mnt proc sbin subdomain tmp var
-
-
- CPU count real total virtual total delay total
- 6 4000250 4000000 0
- IO count delay total
- 0 0
- SWAP count delay total
- 0 0
- RECLAIM count delay total
- 0 0
+ # ./getdelays -d -t 5
+ print delayacct stats ON
+ TGID 5
+
+
+ CPU count real total virtual total delay total delay average
+ 8 7000000 6872122 3382277 0.423ms
+ IO count delay total delay average
+ 0 0 0ms
+ SWAP count delay total delay average
+ 0 0 0ms
+ RECLAIM count delay total delay average
+ 0 0 0ms
+ THRASHING count delay total delay average
+ 0 0 0ms
+ COMPACT count delay total delay average
+ 0 0 0ms
+
+获取pid为1的IO计数，它只和-p一起使用::
+ # ./getdelays -i -p 1
+ printing IO accounting
+ linuxrc: read=65536, write=0, cancelled_write=0
+
+上面的命令与-v一起使用，可以获取更多调试信息。
--
2.7.4
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