June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Avoiding page faults
A page fault occurs when an application reads or writes to memory that is not committed to physical memory. It is impossible (or very hard) to predict when a page fault will happen, so they are another source of non-determinism in computers.
Fortunately, there is a function that allows you to commit all the memory used by the process and lock it down so that it cannot cause a page fault. It is mlockall(2). These are its two flags:
- MCL_CURRENT: This locks all pages currently mapped
- MCL_FUTURE: This locks pages that are mapped in later
You usually call mlockall during the startup of the application with both flags set to lock all current and future memory mappings.
MCL_FUTURE is not magic, in that there will still be ...
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