Linux Process Manager: The Internals of Scheduling, by John O'Gorman
By John O'Gorman
* a great source to appreciate the internals, line by means of line* seems to be at structure based code for laptop model* Addresses approach production, timers, software program and interrupts, signs, tracing techniques, and the digital 8086 mode
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Sample text
231 some of the CPUs on which Linux is implemented have sophisticated caches that can actually distinguish between the same virtual address in two different address spaces. This results in great savings in cache flushes, but it needs some way of identifying different address spaces. The context field holds the address space number assigned to this process. This field is cleared to 0 by fork(). Otherwise, its manipulation is totally architecture-dependent. It is not relevant to the i386. swap_address.
This field is manipulated by the scheduler, and will be considered in Chapter 7. Line 316: cpus_runnable This field is all 1s if the process is not running on any CPU. If it is running on a CPU, then the bit corresponding to that CPU is set. Line 316: cpus_allowed In multiprocessor mode, Linux tries to arrange that processes are scheduled onto CPUs on which they have recently run. This makes better use of caches. This field is a bitmap, specifying the CPUs onto which this process can be scheduled.
Line 342: leader The leader field is a boolean value indicating whether the process is a session leader or not. Line 348: p_opptr, p_pptr, p_cptr, p_ysptr, p_osptr There are a number of pointers to the structures representing other processes that are related to this one. The process that actually created this one (its original parent) is pointed to by p_opptr. The process that is currently its parent is pointed to by p_pptr. These are normally the same. 1). The p_opptr field allows this temporary change to be reversed, when tracing has terminated.