Return to vadvise.2v CVS log

Up to [Research Unix] / researchv10dc / man / manb

Annotation of researchv10dc/man/manb/vadvise.2v, revision 1.1

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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.