linux-kernel - [PATCH][RFC 13/23]: Export of alloc_io

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Date:	Wed, 10 Dec 2008 21:49:19 +0300
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	linux-scsi@...r.kernel.org
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Jeff Garzik <jeff@...zik.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, scst-devel@...ts.sourceforge.net,
	Bart Van Assche <bart.vanassche@...il.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH][RFC 13/23]: Export of alloc_io_context() function

This patch exports alloc_io_context() function. For performance reasons 
SCST queues commands using a pool of IO threads. It is considerably 
better for performance (>30% increase on sequential reads) if threads in 
  a pool have the same IO context. Since SCST can be built as a module, 
it needs alloc_io_context() function exported.

Signed-off-by: Vladislav Bolkhovitin <vst@...b.net>
---
  block/blk-ioc.c |    1 +
  1 file changed, 1 insertion(+)

diff -upkr linux-2.6.27.2/block/blk-ioc.c linux-2.6.27.2/block/blk-ioc.c
--- linux-2.6.27.2/block/blk-ioc.c	2008-10-10 02:13:53.000000000 +0400
+++ linux-2.6.27.2/block/blk-ioc.c	2008-11-25 21:27:01.000000000 +0300
@@ -105,6 +105,7 @@ struct io_context *alloc_io_context(gfp_
 
 	return ret;
 }
+EXPORT_SYMBOL(alloc_io_context);
 
 /*
  * If the current task has no IO context then create one and initialise it.

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