linux-kernel - [PATCH RFC RESEND 01/14] block: kconfig update and build bits for BFQ

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Date:	Tue, 27 May 2014 14:42:25 +0200
From:	paolo <paolo.valente@...more.it>
To:	Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizefan@...wei.com>
Cc:	Fabio Checconi <fchecconi@...il.com>,
	Arianna Avanzini <avanzini.arianna@...il.com>,
	Paolo Valente <posta_paolo@...oo.it>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	Paolo Valente <paolo.valente@...more.it>
Subject: [PATCH RFC RESEND 01/14] block: kconfig update and build bits for BFQ

From: Fabio Checconi <fchecconi@...il.com>

Update Kconfig.iosched and make the related Makefile changes to include
kernel-configuration options for BFQ.

Signed-off-by: Fabio Checconi <fchecconi@...il.com>
Signed-off-by: Paolo Valente <paolo.valente@...more.it>
Signed-off-by: Arianna Avanzini <avanzini.arianna@...il.com>
---
 block/Kconfig.iosched | 19 +++++++++++++++++++
 block/Makefile        |  1 +
 2 files changed, 20 insertions(+)

diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 421bef9..8f98cc7 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -39,6 +39,15 @@ config CFQ_GROUP_IOSCHED
 	---help---
 	  Enable group IO scheduling in CFQ.
 
+config IOSCHED_BFQ
+	tristate "BFQ I/O scheduler"
+	default n
+	---help---
+	  The BFQ I/O scheduler tries to distribute bandwidth among all
+	  processes according to their weights.
+	  It aims at distributing the bandwidth as desired, regardless
+	  of the disk parameters and with any workload.
+
 choice
 	prompt "Default I/O scheduler"
 	default DEFAULT_CFQ
@@ -52,6 +61,15 @@ choice
 	config DEFAULT_CFQ
 		bool "CFQ" if IOSCHED_CFQ=y
 
+	config DEFAULT_BFQ
+		bool "BFQ" if IOSCHED_BFQ=y
+		help
+		  Selects BFQ as the default I/O scheduler which will be
+		  used by default for all block devices.
+		  The BFQ I/O scheduler aims at distributing the bandwidth
+		  as desired, regardless of the disk parameters and with
+		  any workload.
+
 	config DEFAULT_NOOP
 		bool "No-op"
 
@@ -61,6 +79,7 @@ config DEFAULT_IOSCHED
 	string
 	default "deadline" if DEFAULT_DEADLINE
 	default "cfq" if DEFAULT_CFQ
+	default "bfq" if DEFAULT_BFQ
 	default "noop" if DEFAULT_NOOP
 
 endmenu
diff --git a/block/Makefile b/block/Makefile
index 20645e8..cbd83fb 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_BLK_DEV_THROTTLING)	+= blk-throttle.o
 obj-$(CONFIG_IOSCHED_NOOP)	+= noop-iosched.o
 obj-$(CONFIG_IOSCHED_DEADLINE)	+= deadline-iosched.o
 obj-$(CONFIG_IOSCHED_CFQ)	+= cfq-iosched.o
+obj-$(CONFIG_IOSCHED_BFQ)	+= bfq-iosched.o
 
 obj-$(CONFIG_BLOCK_COMPAT)	+= compat_ioctl.o
 obj-$(CONFIG_BLK_DEV_INTEGRITY)	+= blk-integrity.o
-- 
1.9.2

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