The question you described sound like page demanding for data abort. Some reasons for a page fault are following. Try the following: ps -eo min_flt,maj_flt,cmd. Most noticeable single cost? Page fault is searched by the operating system, and trace the virtual pages which are needed. This will list the current running processes on the system along with the number of minor and major page faults that each process has generated. Page fault handling by the CPU. This ultimately is for improving the behavior of applications/games to avoid hangs and/or invalid access messages … I wrote a small test-program to pinpoint this more exactly, and it's interesting. Even if the chances of success are lower, if he is able to succeed in speeding up every page fault on future Intel processors, I would consider that a much greater good. One of the easiest ways to see the number of major and minor page faults on a Linux system is with the ps command. handle_mm_fault is the sub-routine to fix the page table for user space in linux. For example a missing page can be handled by paging in from a remote source, or write-protecting pages and handling write events. And I really mean that "by the CPU" part. -- Logs begin at Wed 2020-01-22 08:45:01 EST, end at Wed 2020-02-26 17:25:39 EST. Between the exception_enter and exception_exit we call actual page fault handler: __do_page_fault(regs, error_code, address); The __do_page_fault is defined in the same source code file as do_page_fault - arch/x86/mm/fault.c. In the beginning of the __do_page_fault we check state of the kmemcheck checker. Personally, I don't care much about the speed of the Linux kernel build system, but I do care about the speed with which page faults are handled by the CPU. Page Fault Handling. Your design has … The memory region descriptors allow the exception handler to perform its job quite efficiently. userfaultfd - create a file descriptor for handling page faults in user space SYNOPSIS #include #include int userfaultfd(int flags); Note: There is no glibc wrapper for this system call; see NOTES. This graceful page fault handling support is on their trek to providing recoverable page fault handling for newer Radeon GPUs with the AMDGPU Linux kernel driver. A page fault is also an implicit interrupt generated by MMU but both are NOT same. In particular we won’t be able to cover: The signal codes (see Table 11-8 in Chapter 11 ) … -- Feb 26 16:28:17 lybica kernel: Linux version 5.5.6-arch1-1 (linux@archlinux) (gcc version 9.2.1 20200130 (Arch Linux 9.2.1+20200130-2)) #1 SMP PREEMPT Mon, 24 Feb 2020 12:20:16 +0000 Feb 26 16:28:17 lybica kernel: Command line: initrd=\initramfs-linux.img initrd=\intel-ucode.img … The kernel VM does really well. Example reasons for page fault are as follows. 8.4 Page Fault Exception Handler. It's literally the cost of the page fault itself, and (to a smaller degree) the cost of the "iret" returning from the page fault. The userfaultfd feature in the Linux kernel allows userspace to handle page faults and some other memory management tasks. ; Assembly programs help to store general registers as well as volatile information. As stated previously, the Linux Page Fault exception handler must distinguish exceptions caused by programming errors from those caused by a reference to a page that legitimately belongs to the process address space but simply hasn't been allocated yet.. All hardware components of computer monitor program counter and kernel that are saved in the stack, and CPU registers have to store all current running state information.