Re: use O_DIRECT open file, when read will hang.

[Andrew Morton]

Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:
>
> I am also seeing some kind of regression on raw in 2.6.0-test5-mm2.

What is "some kind of regression"?

> Unfortunately, this happens only with huge database benchmarks.
> I still haven't narrowed it down.

Use mm3 - it has fixes.  Daniel McNeil reports that mm3 fixes the dbt2
problems he was seeing.

> 
> 	- can I do fsx, rawiobench on NFS files to test DIO on NFS ?

Probably, but it will deadlock immediately.

All the i_sem and i_alloc_sem rework needs to be pushed down to the
blockdev_direct_IO level.  That means reverting
O_DIRECT-race-fixes-fixes-2.patch first.


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