Error Detected During Page Fault Processing
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introducing more precise citations. (February 2008) (Learn how and when to remove this template message) A page fault (sometimes called #PF, PF or hard fault[a]) is a type of interrupt, called trap, raised by computer error detected while processing hardware when a running program accesses a memory page that is mapped into the
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virtual address space, but not actually loaded into main memory. The hardware that detects a page fault is the processor's memory error detected while processing function youcompleteme#enable line 13 management unit (MMU), while the exception handling software that handles page faults is generally a part of the operating system kernel. When handling a page fault, the operating system generally tries to make the required
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page accessible at the location in physical memory, or terminates the program in case of an illegal memory access. Contrary to what "fault" might suggest, valid page faults are not errors, and are common and necessary to increase the amount of memory available to programs in any operating system that utilizes virtual memory, including OpenVMS, Microsoft Windows, Unix-like systems (including Mac OS X, Linux, *BSD, Solaris, AIX, and HP-UX), and error detected while processing function vim_geeknotetoggle z/OS. Contents 1 Types 1.1 Minor 1.2 Major 1.3 Invalid 2 Invalid conditions 3 See also 4 Notes 5 References 6 External links Types[edit] Minor[edit] If the page is loaded in memory at the time the fault is generated, but is not marked in the memory management unit as being loaded in memory, then it is called a minor or soft page fault. The page fault handler in the operating system merely needs to make the entry for that page in the memory management unit point to the page in memory and indicate that the page is loaded in memory; it does not need to read the page into memory. This could happen if the memory is shared by different programs and the page is already brought into memory for other programs. The page could also have been removed from the working set of a process, but not yet written to disk or erased, such as in operating systems that use Secondary Page Caching. For example, HP OpenVMS may remove a page that does not need to be written to disk (if it has remained unchanged since it was last read from disk, for example) and place it on a Free Page List if the working set is deeme
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Page Faults Explained 07-16-2014,11:29 PM #1 Patrick View Profile View Forum Posts View Blog Entries Visit Homepage View Articles Sysnative StaffEmeritus Join error detected while processing function ghcmod#util#check_version Date Jun 2012 Posts4,504 Page Faults Explained Hello everyone! In this post, I'm going to do my best to go in-depth regarding page faults, but do my best to speak English at the same time. There are https://en.wikipedia.org/wiki/Page_fault many page fault related articles out there, but I've noticed they're either picking up from an imaginary somewhere (i.e a rushed explanation that seems to begin and end abruptly), incomplete, assume you're already knowledgeable (even basic) regarding Windows' memory manager, paging, page faults, etc. Recently, thanks very much to Pavel Yosifovich, I have a better understanding of page faults and would like to as always share my knowledge as a whole. First off, https://www.sysnative.com/forums/bsod-kernel-dump-analysis-debugging-information/10551-page-faults-explained.html before even diving into page faults themselves, and especially since we want to do this the right way, we need to understand a few things (well, many things). Disclaimer: I am not going to go extremely in-depth regarding Windows' memory manager (as that would take forever and a half/my knowledge is solely my knowledge), and if you are interested in that, Mark Russinovich has done a brilliant article over at TechNet, as well as many others all across the web if you do some digging (or check the reference links below). I am merely laying the groundwork for the understanding and explanation of page faults and nothing more. If you ask me personally, Windows' memory manager (and memory management in general throughout the operating system) is one of the most complicated and in-depth parts of Windows internals. It's daunting yet extremely fascinating at the same time, as one extremely in-depth piece leads to another. It seems endless, and I highly recommend spending time reading into the memory management specifics throughout Windows, as it's truly fascinating. Physical Memory Physical memory is by far one of the most important resources, and one we must absolutely understand. Among many things, the memory manager within Windows is responsible for the data of all current active processes, drivers, and the operating syste
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About http://stackoverflow.com/questions/5684365/what-causes-page-faults Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What causes page faults? up error detected vote 22 down vote favorite 12 According to Wikipedia: A page fault is a trap to the software raised by the hardware when a program accesses a page that is mapped in the virtual address space, but not loaded in physical memory. (emphasis mine) Okay, that makes sense. But if that's the case, why is it that whenever the process information in Process Hacker is refreshed, error detected while I see about 15 page faults? Or in other words, why is any memory getting paged out? (I have no idea if it's user or kernel memory.) I have no page file, and the RAM usage is about 1.2 GB out of 4 GB, which is after a clean reboot. There's no shortage of any resource; why would anything get paged out? windows x86 paging x86-64 share|improve this question edited Nov 11 '12 at 6:45 Michael Mrozek 71.9k11125136 asked Apr 16 '11 at 3:59 Mehrdad 103k64310612 add a comment| 7 Answers 7 active oldest votes up vote 30 down vote accepted (I'm the author of Process Hacker.) Firstly: A page fault is a trap to the software raised by the hardware when a program accesses a page that is mapped in the virtual address space, but not loaded in physical memory. That's not entirely correct, as explained later in the same article (Minor page fault). There are soft page faults, where all the kernel needs to do is add a page to the working set of the process. Here's a table from the Windows Internals book (I've excluded the ones that result in an access violati