[PATCH v2] staging/lustre: lloop depends on BLOCK

Dilger, Andreas andreas.dilger at intel.com
Thu Aug 1 19:57:22 UTC 2013

On 2013/08/01 2:45 AM, "Christoph Hellwig" <hch at infradead.org> wrote:

>On Tue, Jul 30, 2013 at 08:29:51AM +0800, Xiong Zhou wrote:
>> From: Xiong Zhou <jencce.kernel at gmail.com>
>> In the lustre client driver, lloop depends on BLOCK. Add an
>> option for this dependence. Last version of this patch makes
>> LUSTRE_FS depends on BLOCK.
>> Remove unnecessary jdb head files which depends on BLOCK.
>The driver should be removed, a filesystem has no business bringing
>its own loop driver.

It provides significant performance improvement for network IO on Lustre.
It bypasses DLM locking in Lustre and the VFS layer on the client, copying
in the loop driver, and page-by-page IO submission in the normal IO path.

Cheers, Andreas
Andreas Dilger

Lustre Software Architect
Intel High Performance Data Division

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