| Subject | Re: [PATCH 12/14] scatterlist: allow chaining to preallocated chunks | From | "Martin K. Petersen" <> | Date | Fri, 25 Jul 2014 15:15:04 -0400 |
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>>>>> "Christoph" == Christoph Hellwig <hch@lst.de> writes:
Christoph> Blk-mq drivers usually preallocate their S/G list as part of Christoph> the request, but if we want to support the very large S/G Christoph> lists currently supported by the SCSI code that would tie up Christoph> a lot of memory in the preallocated request pool. Add Christoph> support to the scatterlist code so that it can initialize a Christoph> S/G list that uses a preallocated first chunks and Christoph> dynamically allocated additional chunks. That way the Christoph> scsi-mq code can preallocate a first page worth of S/G Christoph> entries as part of the request, and dynamically extend the Christoph> S/G list when needed.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
-- Martin K. Petersen Oracle Linux Engineering
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