By Daniel P. Bovet, Marco Cesati
In order to completely comprehend what makes Linux tick and why it really works so good on a wide selection of platforms, you must delve deep into the guts of the kernel. The kernel handles all interactions among the CPU and the exterior global, and determines which courses will proportion processor time, in what order. It manages restricted reminiscence so good that enormous quantities of strategies can proportion the method successfully, and expertly organizes info transfers in order that the CPU isn't really stored ready from now on than worthwhile for the quite gradual disks.
The 3rd variation of Understanding the Linux Kernel takes you on a guided travel of the main major information constructions, algorithms, and programming methods utilized in the kernel. Probing past superficial good points, the authors provide necessary insights to those who need to know how issues rather paintings inside of their computer. vital Intel-specific positive factors are mentioned. proper segments of code are dissected line by way of line. however the booklet covers greater than simply the functioning of the code; it explains the theoretical underpinnings of why Linux does issues how it does.
This variation of the publication covers model 2.6, which has obvious major alterations to almost each kernel subsystem, relatively within the parts of reminiscence administration and block units. The e-book specializes in the subsequent topics:
- Memory administration, together with dossier buffering, strategy swapping, and Direct reminiscence entry (DMA)
- The digital Filesystem layer and the second one and 3rd prolonged Filesystems
- Process production and scheduling
- Signals, interrupts, and the fundamental interfaces to equipment drivers
- Timing
- Synchronization in the kernel
- Interprocess communique (IPC)
- Program execution
Understanding the Linux Kernel will acquaint you with the entire internal workings of Linux, yet it really is greater than simply an educational workout. you will research what stipulations carry out Linux's most sensible functionality, and you can see the way it meets the problem of supplying strong process reaction in the course of technique scheduling, dossier entry, and reminiscence administration in a wide selection of environments. This ebook can assist you're making the main of your Linux system.
Read or Download Understanding the Linux Kernel, Third Edition PDF
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Additional info for Understanding the Linux Kernel, Third Edition
If the kernel features enforcing the execution area and the executable structure (see bankruptcy 20) of the hot approach are incorporated in kernel modules, it raises their utilization counters (see Appendix B). units a couple of an important fields with regards to the method nation: Initializes the massive kernel lock counter tsk->lock_depth to -1 (see the part "The large Kernel Lock" in bankruptcy 5). Initializes the tsk->did_exec box to zero: it counts the variety of execve( ) process calls issued by way of the method. Updates a few of the flags integrated within the tsk->flags box which were copied from the dad or mum technique: first clears the PF_SUPERPRIV flag, which shows no matter if the method has used any of its superuser privileges, then units the PF_FORKNOEXEC flag, which shows that the kid has no longer but issued an execve( ) procedure name. shops the PID of the hot procedure within the tsk->pid box. If the CLONE_PARENT_SETTID flag within the clone_flags parameter is determined, it copies the kid's PID into the consumer Mode variable addressed by means of the parent_tidptr parameter. Initializes the list_head information buildings and the spin locks integrated within the kid's strategy descriptor, and units up a number of different fields regarding pending signs, timers, and time information. Invokes copy_semundo( ), copy_files( ), copy_fs( ), copy_sighand( ), copy_signal( ), copy_mm( ), and copy_namespace( ) to create new info constructions and duplicate into them the values of the corresponding mum or dad method information constructions, except distinctive in a different way through the clone_flags parameter. Invokes copy_thread( ) to initialize the Kernel Mode stack of the kid procedure with the values inside the CPU registers whilst the clone( ) procedure name used to be issued (these values were kept within the Kernel Mode stack of the guardian, as defined in bankruptcy 10). although, the functionality forces the worth zero into the sphere reminiscent of the eax sign in (this is the kid's go back worth of the fork() or clone( ) procedure call). The thread. esp box within the descriptor of the kid technique is initialized with the bottom handle of the kid's Kernel Mode stack, and the deal with of an meeting language functionality (ret_from_fork( )) is kept within the thread. eip box. If the mother or father technique uses an I/O Permission Bitmap, the kid will get a replica of such bitmap. ultimately, if the CLONE_SETTLS flag is decided, the kid will get the TLS phase laid out in the person Mode facts constitution pointed to via the tls parameter of the clone( ) process name. [*] If both CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID is determined within the clone_flags parameter, it copies the worth of the child_tidptr parameter within the tsk->set_chid_tid or tsk->clear_child_tid box, respectively. those flags specify that the price of the variable pointed to via child_tidptr within the consumer Mode handle house of the kid needs to be replaced, even if the particular write operations can be performed later. Turns off the TIF_SYSCALL_TRACE flag within the thread_info constitution of the kid, in order that the ret_from_fork( ) functionality won't notify the debugging technique in regards to the approach name termination (see the part "Entering and Exiting a process name" in bankruptcy 10).