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List:       freebsd-hackers
Subject:    Re: How to tune the number of pages that is brought into the memory when a page fault occurs .
From:       Konstantin Belousov <kostikbel () gmail ! com>
Date:       2020-10-16 10:15:48
Message-ID: 20201016101548.GT2643 () kib ! kiev ! ua
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On Fri, Oct 16, 2020 at 01:37:56PM +0530, SHAMANTHA KRISHNA K G wrote:
> Hello All,
>            Is there any way of changing the number of pages that Is brought
> into the memory when a page fault occurs?

Look at madvise(2) and posix_madvise(2).  It does not give the direct knob
to change the number, but it allows to set a policy affecting this decision.
In particular, it allows to disable prefeching at all with MADV_RANDOM.

The mmap(2) syscall also provides MAP_PREFAULT_READ, read about it in the
man page.
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