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    SubjectRe: [RFC PATCH] ext3 writepage() journal avoidance
    On Fri, Mar 10, 2006 at 09:43:57AM +0100, Arjan van de Ven wrote:
    > On Fri, 2006-03-10 at 00:23 -0800, Andrew Morton wrote:
    > > Arjan van de Ven <arjan@infradead.org> wrote:
    > > >
    > > >
    > > > > I'm not sure that PageMappedToDisk() gets set in all the right places
    > > > > though - it's mainly for the `nobh' handling and block_prepare_write()
    > > > > would need to be taught to set it. I guess that'd be a net win, even if
    > > > > only ext3 uses it..
    > > >
    > > > btw is nobh mature enough yet to become the default, or to just go away
    > > > entirely as option ?
    > >
    > > I don't know how much usage it's had, sorry. It's only allowed in
    > > data=writeback mode and not many people seem to use even that.
    >
    > would you be prepared to turn it on by default in -mm for a bit to see
    > how it holds up? The concept seems valuable in itself, so much so that I
    > feel this should be 1) on always by default when possible and 2) isn't
    > really the kind of thing that should be a long term option; not having
    > it almost is a -o pleaseAddThisBug option for each bug fixed.

    It'd be good to get that hammered on, as it doesn't see hardly any testing
    based upon the experiments I did sometime last year. It left me with
    an unmountable root filesystem :-/

    Dave

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