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Date:	Fri, 25 Jul 2014 15:15:04 -0400
From:	"Martin K. Petersen" <>
To:	Christoph Hellwig <>
Cc:	James Bottomley <>,, Jens Axboe <>,
	Bart Van Assche <>,
	Mike Christie <>,
	"Martin K. Petersen" <>,
	Robert Elliott <>, Webb Scales <>,
Subject: Re: [PATCH 12/14] scatterlist: allow chaining to preallocated chunks

>>>>> "Christoph" == Christoph Hellwig <> 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 K. Petersen	Oracle Linux Engineering
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