cvs commit: src/sys/vm vm_page.c

Poul-Henning Kamp phk at
Fri Jun 6 19:11:24 UTC 2008

In message <200806061838.m56Icu2E074642 at>, Alan Cox writes:
>alc         2008-06-06 18:38:43 UTC
>  FreeBSD src repository
>  Modified files:
>    sys/vm               vm_page.c 
>  Log:
>  SVN rev 179623 on 2008-06-06 18:38:43Z by alc
>  Essentially, neither madvise(..., MADV_DONTNEED) nor madvise(..., MADV_FREE)
>  work.  (Moreover, I don't believe that they have ever worked as intended.)

I remember they did have a measurable but minor impact on performance
in systems which paged a lot, back when they were introduced, sort
of 1995-ish.  But with the subsequent plunge in RAM prices they
never saw much use.

Thanks for fixing them.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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