Re: 2.6.19 -mm merge plans

Badari Pulavarty
2006-09-20T21:38:33Z

On Wed, 2006-09-20 at 13:54 -0700, Andrew Morton wrote:

Sorry, I didn't get back to this earlier. I have been chasing
one more ext2 & ext3 regression (this time with random reads).
Anyway ..

> add-address_space_operationsbatch_write.patch
> add-address_space_operationsbatch_write-fix.patch
> pass-io-size-to-batch_write-address-space-operation.patch
>
> These add a new address_space operation. For reiser4, with potential for
> use by other filesystems.
>
> Problem is, 2.6.18 has a significant writev() performace regression on NFS
> and probably on other filesystems. Because 2.6.18 does
> prepare_write/commit_write for each iovec segment. We want to go back to
> copying mulitple iovec segments within a single prepare_write/commit_write.
>
> Plus there's still the possible deadlock in our standard write() function
> (thw thing which fault_in_pages_readable() tries to prevent).
>
> All of this should be fixed.

What needs to be fixed here ?

Thanks,
Badari