![]() Pass 4: using cached /root/.systemtap/cache/02/stap_02d3975cd5dedf7b6697a2d5f92f966a_3811.koĢ) Execute the process model program on another terminal. Pass 2: analyzed script: 2 probe(s), 8 function(s), 0 embed(s), 0 global(s) in 670usr/40sys/699real ms. Pass 1: parsed user script and 54 library script(s) in 680usr/40sys/728real ms. ![]() fork_exit.stp: systemtap script to overlook satprocess/satthread It creates a child thread and join it several It creates a child process and wait for it What do you think? Any comments are welcome.īTW, We can easily confirm the problem with systemtap, a convenient diagnostic We also need to change sys_getppid() implementation. However it has many side effects, for example, It needs extra memory.ī) Doesn't add extra field and have thread's parent the creater, which is Now I have some patch plan to fix this problem as follow:Ī) Add the field for the creator to task_struct. I believe it's a bug and the exiting process should give its timeslice In addition, somehow, the parent (typically shell?) gets extra Hence, on this kind of program, the creatorĬan't retrieve shared timeslice and exausts its timeslice at a rate of However, on the thread model, the creator is not the parent, it is sameĪs the creator's parent. It has no problem on the process model since the creator is the parent. Timeslice yet, it gives its timeslice to the parent. Sched_fork()/sched_exit() implementation as follows:Ī) On sched_fork, the creator share its timeslice with new process.ī) On sched_exit, if the exiting process didn't exhaust its first I found that the thread model's latency is longer than proess Each child process/thread does the assigned job and exit immediately. The process creates a thread or a process per job (I examined bothģ. There are a large amount of small jobs takes several msecs,Īnd the number of job increases constantly.Ģ. When I was examining the following program. Next in thread: Satoru Takeuchi: "Re: scheduler: first timeslice of the exiting thread".Previous message: Jiri Slaby: "Re: Char: cyclades, remove volatiles".Next message: johnrobertbanks: "Re: COMPILING AND CONFIGURING A NEW KERNEL.".the * initial _kernel.Linux-Kernel Archive: scheduler: first timeslice of the exiting thread scheduler: first timeslice of the exiting thread From: Satoru Takeuchi */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include LOG_MODULE_DECLARE ( os, CONFIG_KERNEL_LOG_LEVEL ) #ifdef CONFIG_THREAD_MONITOR /* This lock protects the linked list of active threads i.e. * * SPDX-License-Identifier: Apache-2.0 */ /** * * Kernel thread support * * This module provides general purpose thread support. * * Copyright (c) 2010-2014 Wind River Systems, Inc.
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