Messages in this thread | | | Date | Thu, 26 Mar 2009 19:00:10 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: Linux 2.6.29 |
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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?
Hugh
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