linux-kernel - [PATCH RFC RESEND 03/14] block: add hierarchical-support option to kconfig

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Message-Id: <1401194558-5283-4-git-send-email-paolo.valente@unimore.it>
Date:	Tue, 27 May 2014 14:42:27 +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 03/14] block: add hierarchical-support option to kconfig

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

Add the CGROUP_BFQIO option to Kconfig.iosched. This option allows
full hierarchical support to be enabled in BFQ, and the bfqio
controller to be added to the cgroups interface.

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 | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 8f98cc7..a3675cb 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -46,7 +46,18 @@ config IOSCHED_BFQ
 	  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.
+	  of the disk parameters and with any workload. If compiled
+	  built-in (saying Y here), BFQ can be configured to support
+	  hierarchical scheduling.
+
+config CGROUP_BFQIO
+	bool "BFQ hierarchical scheduling support"
+	depends on CGROUPS && IOSCHED_BFQ=y
+	default n
+	---help---
+	  Enable hierarchical scheduling in BFQ, using the cgroups
+	  filesystem interface.  The name of the subsystem will be
+	  bfqio.
 
 choice
 	prompt "Default I/O scheduler"
-- 
1.9.2

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