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    SubjectRe: [RFC] JBD ordered mode rewrite
    On Thu 06-03-08 14:05:03, Josef Bacik wrote:
    > On Thursday 06 March 2008 12:42:09 pm Jan Kara wrote:
    > > Hi,
    > >
    > > Below is my rewrite of ordered mode in JBD. Now we don't have a list of
    > > data buffers that need syncing on transaction commit but a list of inodes
    > > that need writeout during commit. This brings all sorts of advantages such
    > > as possibility to get rid of journal heads and buffer heads for data
    > > buffers in ordered mode, better ordering of writes on transaction commit,
    > > simplification of some JBD code, no more anonymous pages when truncate of
    > > data being committed happens. The patch has survived some light testing
    > > but it still has some potential of eating your data so beware :) I've run
    > > dbench to see whether we didn't decrease performance by different handling
    > > of truncate and the throughput I'm getting on my machine is the same (OK,
    > > is lower by 0.5%) if I disable the code in truncate waiting for commit to
    > > finish... Also the throughput of dbench is about 2% better with my patch
    > > than with current JBD.
    > > Any comments or testing most welcome.
    > >
    > > Honza
    >
    > Just one nit, doesn't compile properly when jbd/ext3 are modules :). Thanks
    > much,
    Thanks for spotting this. Will fix :).

    Honza
    --
    Jan Kara <jack@suse.cz>
    SUSE Labs, CR


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