Re: Very aggressive swapping after 2 hours rest

From: Rik van Riel (riel@conectiva.com.br)
Date: Sat Sep 16 2000 - 14:31:13 EDT

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    On Sat, 16 Sep 2000, Byron Stanoszek wrote:
    > On Sat, 16 Sep 2000, Rik van Riel wrote:
    >
    > > MemFree: memory on the freelist, contains no data
    > > Buffers: buffer cache memory
    > > Cached: page cache memory
    > >
    > > Active: buffer or page cache memory which is in active
    > > use (that is, page->age > 0 or many references)
    > > Inact_dirty: buffer or cache pages with page->age == 0 that
    > > /might/ be freeable
    > > (page->buffers is set or page->count == 2 when
    > > we add the page ... while holding a reference)
    > > Inact_clean: page cache pages with page->age == 0 of which
    > > we are /certain/ that they are freeable, these
    > > are counted almost as free pages
    > > Inact_target: the net amount of allocations we get per second,
    > > averaged over one minute
    >
    > I think I understand what those numbers mean, now. :)

    Cool ;)

    > But, I guess I'm still looking for a calculation that tells me
    > exactly how many free (non-in-use) pages that I can allocate
    > before running out of memory.

    > total used free shared buffers cached
    > Mem: 126516 34728 91788 0 264 7836
    > -/+ buffers/cache: 26628 99888
    > Swap: 32124 964 31160
    >
    >
    > Here, the value 26628+964 is closer to what the 'actual' amount
    > of RAM usage really is by processes (minus shared mem, buffers,
    > and cache). But I was unable to find that without the
    > allocation. So, my question is, is it possible to add a line to
    > /proc/meminfo that tells us this information?

    It would be better to put that in a userspace tool like
    vmstat.

    Oh, and now we're talking about vmstat, I guess that
    program also needs support for displaying the number
    of active/inactive_dirty/inactive_clean pages ... ;)

    (any volunteers?)

    regards,

    Rik 

    --
"What you're running that piece of shit Gnome?!?!"
       -- Miguel de Icaza, UKUUG 2000

    http://www.conectiva.com/		http://www.surriel.com/

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