Re: Softupdates a mount option?

From: Bernd Walter (ticso_at_cicely12.cicely.de)
Date: 05/28/04

  • Next message: Willem Jan Withagen: "Possible bug in malloc-code" 
    Date: Fri, 28 May 2004 01:20:10 +0200
To: Ivan Voras <ivoras@fer.hr>

    On Thu, May 27, 2004 at 05:45:50PM +0200, Ivan Voras wrote:
    > Bernd Walter wrote:
    >
    > >>>SU makes perfectly sense for swap backed md drives.
    > >>
    > >>I always thought the "swap backed" meant the memory is allocated from the
    > >>same pool as for userland applications, e.g. they only get swapped out if
    > >>memory is scarce. Is this wrong?
    > >
    > >
    > >You are right, but md(4) doesn't know about the filesystem and therefor
    > >can't know which blocks have content to keep and which are unused.
    > >SU now allows files that are deleted quite fast to never touch the
    > >block device and md never need to write those blocks into swap storage
    > >as they never got dirty.
    >
    > As opposed to the 'async' mode?

    I think all async mode files get writen sooner or later even if already
    deleted, but I'm not shure. 

    -- 
B.Walter                   BWCT                http://www.bwct.de
bernd@bwct.de                                  info@bwct.de
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