0xAX/linux-insides

SYSCALL - multitasking & Interruput event

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#493 opened on 2017年7月16日

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help wanted

説明

Dear OxAX , Thanks for your efforts for writing "Linux Inside" . It has cleared most of my doubts. I request you to please elaborate few technical doubts about System call .

  1. System call in multitasking environment : a. What will happen if higher priority task need system resources by SYSCALL but already lower priority task's SYSCALL in running ( kernel code is executing ) ?

b. During one system call multitasking / multi threading is still possible or only one thread will have access to SYSCALL ?

  1. System call during External / Peripheral interrupt : a. what will happen if external interrupt or higher priority pheripheral interrupt triggers while processing SYSCALL ?

Request you to please reply on this & if possible please add explanation in "Linux Inside"

Regards, Gaurav

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技術スタック
c
領域
documentation
Issue 種別
documentation
難度新しい貢献者にとっての実装難度です。1 は非常に小さな変更、5 は専門的な作業です。
4
推定時間経験ある貢献者が調査、実装、テスト、pull request 準備にかけるおおよその時間範囲です。
over 1 week
活動状況Issue が今どれだけ取り組みやすいかを示します。新しい、活発、古い、ブロック中、またはメンテナー入力待ちなどです。
stale
明確さ期待される変更、受け入れ条件、次の手順がどれだけ明確かを示します。
mostly clear
前提条件
Linux kernel basicssystem call mechanismsinterrupt handling
初心者向け度初回貢献者にどれだけ取り組みやすいかを 1-100 で推定したスコアです。
15
調査方針
Investigate the Linux kernel syscall entry points (e.g., arch/x86/kernel/entry 64.S) and scheduling mechanism (kernel/sched/core.c) to explain how system calls interact with multitasking. Also analyze interrupt handling code (kernel/irq/) to describe what happens when an interrupt occurs during a syscall. Consider adding a new section to the linux insides book covering these scenarios.