Messages in this thread | | | Date | Mon, 10 Feb 2003 08:31:59 +0100 | From | Andrea Arcangeli <> | Subject | Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest] |
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On Mon, Feb 10, 2003 at 02:47:19AM -0200, Rik van Riel wrote: > On Sun, 9 Feb 2003, Andrew Morton wrote: > > David Lang <david.lang@digitalinsight.com> wrote: > > > > > > note that issuing a fsync should change all pending writes to 'syncronous' > > > as should writes to any partition mounted with the sync option, or writes > > > to a directory with the S flag set. > > > > We know, at I/O submission time, whether a write is to be waited upon. > > That's in writeback_control.sync_mode. > > An fsync might change already submitted asynchronous writes > into synchronous writes, but this is not something I'm going > to lose sleep over. ;)
correct.
> > > That, combined with an assumption that "all reads are synchronous" would > > allow the outgoing BIOs to be appropriately tagged. > > > > It's still approximate. > > Sounds like a good enough approximation to me.
yes, the approximation should be more than enough IMHO
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