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    SubjectRe: Linux 2.6.29
    On Thu, Mar 26 2009, Hugh Dickins wrote:
    > On Thu, 26 Mar 2009, Jens Axboe wrote:
    > > On Thu, Mar 26 2009, Hugh Dickins wrote:
    > > >
    > > > So, directing a barrier (WRITE_BARRIER or DISCARD_BARRIER) to a range
    > > > of sectors in one partition interposes a barrier into the queue of I/O
    > > > across (all partitions of) that whole device.
    > >
    > > Correct
    > >
    > > > I think that's not how filesystems really want barriers to behave,
    > > > and might tend to discourage us from using barriers more freely.
    > > > But I have zero appreciation of whether it's a significant issue
    > > > worth non-trivial change - just wanted to get it out into the open.
    > >
    > > Per-partition definitely makes sense. The problem is that we do sorting
    > > on a per-device basis right now. But it's a good point, I'll try and
    > > take a look at how much work it would be to make it per-partition
    > > instead. It wont be trivial :-)
    >
    > Thanks, that would be interesting.
    > Trivial bores you anyway, doesn't it?

    You're a good motivator, Hugh!

    --
    Jens Axboe



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