Re: headsup: swap_pager.c

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 08/01/03

  • Next message: Dan Nelson: "Re: headsup: swap_pager.c" 
    To: des@des.no (Dag-Erling Smørgrav)
Date: Fri, 01 Aug 2003 12:02:00 +0200

    In message <xzpel0568cn.fsf@dwp.des.no>, Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=
     writes:
    >"Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
    >> The thing you overlook is that often when things gets paged out, the
    >> system is short on memory and therefore more likely to not do anything
    >> productive, whereas when things gets paged in, there are a better chance
    >> of some other process being able to use the CPU time productively.
    >> If we did predictive pageouts like some of the "serious" mainfram OS's
    >> this would be less true.
    >
    >How hard would it be to get the kernel to write the pages "most likely
    >to be swapped out" to swap in the idle loop, to save time if / when
    >they actually need to be swapped out later?

    I don't know :-)

    Quite frankly, given the sizes of RAM we see these days, I think that
    paging optimizations may be largely a thing of the past. 

    -- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@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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  • Next message: Dan Nelson: "Re: headsup: swap_pager.c"

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