Re: HEADSUP: UMA not reentrant / possible memory leak

From: Bosko Milekic (bmilekic_at_technokratis.com)
Date: 07/30/03

  • Next message: Jeff Roberson: "Re: HEADSUP: UMA not reentrant / possible memory leak" 
    Date: Tue, 29 Jul 2003 22:19:28 +0000
To: Tor.Egge@cvsup.no.freebsd.org

    On Wed, Jul 30, 2003 at 01:23:21AM +0000, Tor.Egge@cvsup.no.freebsd.org wrote:
    > > The indication of this is that the g_bio zone does not return to
    > > zero USED as it should.
    >
    > It looks like z->uz_cachefree is slightly out of date (updated in
    > zone_timout() every 20th second) and often too low (not taking the
    > z->uz_full_bucket list into account).
    >
    > The enclosed patch recalculates the number of free elements on the
    > buckets instead of using z->uz_cachefree.
    >
    > - Tor Egge
    >

       We took this into account when we did the comparison. We know that
       uz_cachefree is only a snapshot count; but Poul-Henning`s patch
       clearly illustrates a frequent fluctuation in the free zone value but
       where the actual number of allocated g_bio zone elements stays stable
       at 0, for example.

       The fact that the problem is solved when buckets are disabled also is
       indicative that there is a clear reentrancy problems somewhere.
       There may also be some bucket leakage (although I have not yet
       confirmed this) as well.

        

    -- 
Bosko Milekic  *  bmilekic@technokratis.com  *  bmilekic@FreeBSD.org
TECHNOkRATIS Consulting Services  *  http://www.technokratis.com/
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  • Next message: Jeff Roberson: "Re: HEADSUP: UMA not reentrant / possible memory leak"