core/linux-kirkwood add BFQ patch files (source host seems to be down)

core/linux-kirkwood/0001-block-bfq-attempt-to-fix-use-after-free-which-3.3.0-to-3.8.0.patch

@@ -0,0 +1,62 @@
+From 599be431332e31a25ebe203155fa18d34781c3d3 Mon Sep 17 00:00:00 2001
+From: Arianna Avanzini <avanzini.arianna@gmail.com>
+Date: Tue, 5 Mar 2013 10:41:49 +0100
+Subject: [PATCH] block, bfq: attempt to fix use-after-free which affects SLUB
+ behavior (3.3.0 to 3.8.0)
+
+It may happen that a call to bfq_del_bfqq_busy() puts the last
+reference taken on a queue and frees it. Subsequent accesses to that
+same queue would result in a use-after-free. Make sure that a queue
+that has just been deleted from busy is no more touched.
+---
+ block/bfq-iosched.c | 20 ++++++++++----------
+ 1 file changed, 10 insertions(+), 10 deletions(-)
+
+diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
+index 9378b7d..e9a6514 100644
+--- a/block/bfq-iosched.c
++++ b/block/bfq-iosched.c
+@@ -1244,14 +1244,23 @@ static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq)
+ 
+ 	__bfq_bfqd_reset_active(bfqd);
+ 
++	/*
++	 * If this bfqq is shared between multiple processes, check
++	 * to make sure that those processes are still issuing I/Os
++	 * within the mean seek distance. If not, it may be time to
++	 * break the queues apart again.
++	 */
++	if (bfq_bfqq_coop(bfqq) && BFQQ_SEEKY(bfqq))
++		bfq_mark_bfqq_split_coop(bfqq);
++
+ 	if (RB_EMPTY_ROOT(&bfqq->sort_list)) {
+-		bfq_del_bfqq_busy(bfqd, bfqq, 1);
+ 		/*
+ 		 * overloading budget_timeout field to store when
+ 		 * the queue remains with no backlog, used by
+ 		 * the weight-raising mechanism
+ 		 */
+ 		bfqq->budget_timeout = jiffies ;
++		bfq_del_bfqq_busy(bfqd, bfqq, 1);
+ 	} else {
+ 		bfq_activate_bfqq(bfqd, bfqq);
+ 		/*
+@@ -1259,15 +1268,6 @@ static void __bfq_bfqq_expire(struct bfq_data *bfqd, struct bfq_queue *bfqq)
+ 		 */
+ 		bfq_rq_pos_tree_add(bfqd, bfqq);
+ 	}
+-
+-	/*
+-	 * If this bfqq is shared between multiple processes, check
+-	 * to make sure that those processes are still issuing I/Os
+-	 * within the mean seek distance. If not, it may be time to
+-	 * break the queues apart again.
+-	 */
+-	if (bfq_bfqq_coop(bfqq) && BFQQ_SEEKY(bfqq))
+-		bfq_mark_bfqq_split_coop(bfqq);
+ }
+ 
+ /**
+-- 
+1.8.1.4
+

core/linux-kirkwood/0001-block-cgroups-kconfig-build-bits-for-BFQ-v6-3.8.patch

@@ -0,0 +1,97 @@
+From 59fd22f37d9acfa07186a02bb1cd2d64785d82b1 Mon Sep 17 00:00:00 2001
+From: Arianna Avanzini <avanzini.arianna@gmail.com>
+Date: Sat, 4 Feb 2012 10:55:51 +0100
+Subject: [PATCH 1/2] block: cgroups, kconfig, build bits for BFQ-v6-3.8
+
+Update Kconfig.iosched and do the related Makefile changes to include
+kernel configuration options for BFQ. Also add the bfqio controller
+to the cgroups subsystem.
+
+Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
+Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com>
+---
+ block/Kconfig.iosched         | 26 ++++++++++++++++++++++++++
+ block/Makefile                |  1 +
+ include/linux/cgroup_subsys.h |  6 ++++++
+ 3 files changed, 33 insertions(+)
+
+diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
+index 421bef9..56474b2 100644
+--- a/block/Kconfig.iosched
++++ b/block/Kconfig.iosched
+@@ -39,6 +39,28 @@ config CFQ_GROUP_IOSCHED
+ 	---help---
+ 	  Enable group IO scheduling in CFQ.
+ 
++config IOSCHED_BFQ
++	tristate "BFQ I/O scheduler"
++	depends on EXPERIMENTAL
++	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, independently of
++	  the disk parameters and with any workload. It also tries to
++	  guarantee low latency to interactive and soft real-time
++	  applications.  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"
+ 	default DEFAULT_CFQ
+@@ -52,6 +74,9 @@ choice
+ 	config DEFAULT_CFQ
+ 		bool "CFQ" if IOSCHED_CFQ=y
+ 
++	config DEFAULT_BFQ
++		bool "BFQ" if IOSCHED_BFQ=y
++
+ 	config DEFAULT_NOOP
+ 		bool "No-op"
+ 
+@@ -61,6 +86,7 @@ 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 39b76ba..c0d20fa 100644
+--- a/block/Makefile
++++ b/block/Makefile
+@@ -15,6 +15,7 @@ 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
+diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
+index f204a7a..b999bfa 100644
+--- a/include/linux/cgroup_subsys.h
++++ b/include/linux/cgroup_subsys.h
+@@ -78,3 +78,9 @@ SUBSYS(hugetlb)
+ #endif
+ 
+ /* */
++
++#ifdef CONFIG_CGROUP_BFQIO
++SUBSYS(bfqio)
++#endif
++
++/* */
+-- 
+1.8.1.2
+