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Asked: 2026-06-03T05:31:11+00:00

I have mapped a file into memory using mmap . Now I would like

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I have mapped a file into memory using mmap. Now I would like to ensure that there will be no page faults when accessing this memory, i.e. I want to force the system to actually read the data from the harddisk and store it in RAM. I believe
that once the data is there, I can prevent swapping with mlockall. But what is the proper way to get the system to load the data?

I could obviously just do dummy reads of all the pages, but this seems like an ugly hack. Also, I don’t want to worry about the compiler being too smart and optimizing away the dummy reads.

Any suggestions?

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1 Answer

  1. Editorial Team

    You’re looking for MAP_POPULATE.

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