Re: headsup: swap_pager.c

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 08/02/03

  • Next message: Andy Farkas: "Re: headsup: swap_pager.c" 
    To: Andy Farkas <andyf@speednet.com.au>
Date: Sat, 02 Aug 2003 15:46:45 +0200

    In message <20030802221832.S41132-100000@hewey.af.speednet.com.au>, Andy Farkas
     writes:
    >Poul-Henning Kamp wrote:
    >
    >> Setting NSWAPDEV=1 is not an option, because that means that
    >> administrators which find themselves in a pinch can not add another
    >> swap-space to ride off a storm.
    >
    >You still are not explaining why the current code is wrong. You say
    >"bogo-vnode". Please explain what that means.

    A bogos vnode.

    >What does "in a pinch" mean??

    That for instance you are running out of swap, if NSWAPDEV==1 you cannot
    add another swapdev because the one and only slot is occupied (and the
    device is filled too).

    >What do those numbers in kern.malloc mean??

    That the corresponding amount of RAM is unchangably occupied by a table
    which is 3/4 empty and therefore nothing else can use that RAM productively. 

    -- 
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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