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Annotation of 43BSDReno/old/man/vadvise.2v, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)vadvise.2v  4.1 (Berkeley) 5/9/85
        !             6: .\"
        !             7: .TH VADVISE 2V
        !             8: .UC 4
        !             9: .SH NAME
        !            10: vadvise \- give advice to paging system
        !            11: .SH SYNOPSIS
        !            12: .B vadvise(param)
        !            13: .SH DESCRIPTION
        !            14: .I Vadvise
        !            15: is used to inform the system that process paging behavior merits special
        !            16: consideration.  Parameters to
        !            17: .I vadvise
        !            18: are defined in the file
        !            19: .B <vadvise.h> .
        !            20: Currently, two calls to
        !            21: .I vadvise
        !            22: are implemented:
        !            23: .PP
        !            24: The call
        !            25: .IP
        !            26: .B "vadvise(VA_ANOM);"
        !            27: .LP
        !            28: advises that the paging behavior is not likely to
        !            29: be well handled by the system's default algorithm, since reference information
        !            30: collected over macroscopic intervals (e.g. 10-20 seconds)
        !            31: will not serve to indicate future page references.  The system in this case
        !            32: will choose to replace pages with little emphasis placed on recent usage,
        !            33: and more emphasis on referenceless circular behavior.  It is \fIessential\fR
        !            34: that processes which have very random paging behavior (such as
        !            35: LISP during garbage collection of very large address spaces) call
        !            36: .I vadvise,
        !            37: as otherwise the system has great difficulty dealing with their
        !            38: page-consumptive demands.
        !            39: .PP
        !            40: The call
        !            41: .IP
        !            42: .B "vadvise(VA_NORM);"
        !            43: .LP
        !            44: restores default paging replacement behavior after a call to
        !            45: .IP
        !            46: .B "vadvise(VA_ANOM);"
        !            47: .SH BUGS
        !            48: This call is peculiar to this version of UNIX.
        !            49: The options and specifications of this system call and even the call itself
        !            50: are expected to change.  It is expected to be extended with additional
        !            51: facilities in future versions of the system.  In particular it is expected
        !            52: that this call will be particular to a segment, and that other behaviors
        !            53: such as sequential behavior will be specifiable.

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