linux-kernel - [RFC PATCH 03/11] block: Add queue attributes to manage dpmg and swapin requests

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Date:	Wed, 18 Apr 2012 11:55:24 +0530
From:	Venkatraman S <svenkatr@...com>
To:	<linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
CC:	<arnd.bergmann@...aro.org>, <cjb@...top.org>,
	<alex.limberg@...disk.com>, <ilan.smith@...disk.com>,
	<lporzio@...ron.com>, Venkatraman S <svenkatr@...com>,
	Alex Lemberg <alex.lemberg@...disk.com>
Subject: [RFC PATCH 03/11] block: Add queue attributes to manage dpmg and swapin requests

Add block queue properties to identify and manage demand paging
and swap read requests differently. sysfs entries are included
to enable or disable this feature at runtime.

Signed-off-by: Venkatraman S <svenkatr@...com>
Signed-off-by: Ilan Smith <ilan.smith@...disk.com>
Signed-off-by: Alex Lemberg <alex.lemberg@...disk.com>
---
 block/blk-sysfs.c      |   16 ++++++++++++++++
 include/linux/blkdev.h |    8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index cf15001..764de9f 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -213,6 +213,8 @@ queue_store_##name(struct request_queue *q, const char *page, size_t count) \
 }
 
 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
+QUEUE_SYSFS_BIT_FNS(expedite_dmpg, EXP_DMPG, 0);
+QUEUE_SYSFS_BIT_FNS(expedite_swapin, EXP_SWAPIN, 0);
 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
 QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
 #undef QUEUE_SYSFS_BIT_FNS
@@ -387,6 +389,18 @@ static struct queue_sysfs_entry queue_random_entry = {
 	.store = queue_store_random,
 };
 
+static struct queue_sysfs_entry queue_dmpg_entry = {
+	.attr = {.name = "expedite_demandpaging", .mode = S_IRUGO | S_IWUSR },
+	.show = queue_show_expedite_dmpg,
+	.store = queue_store_expedite_dmpg,
+};
+
+static struct queue_sysfs_entry queue_swapin_entry = {
+	.attr = {.name = "expedite_swapping", .mode = S_IRUGO | S_IWUSR },
+	.show = queue_show_expedite_swapin,
+	.store = queue_store_expedite_swapin,
+};
+
 static struct attribute *default_attrs[] = {
 	&queue_requests_entry.attr,
 	&queue_ra_entry.attr,
@@ -409,6 +423,8 @@ static struct attribute *default_attrs[] = {
 	&queue_rq_affinity_entry.attr,
 	&queue_iostats_entry.attr,
 	&queue_random_entry.attr,
+	&queue_dmpg_entry.attr,
+	&queue_swapin_entry.attr,
 	NULL,
 };
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 606cf33..fd620b9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -420,6 +420,8 @@ struct request_queue {
 #define QUEUE_FLAG_ADD_RANDOM  16	/* Contributes to random pool */
 #define QUEUE_FLAG_SECDISCARD  17	/* supports SECDISCARD */
 #define QUEUE_FLAG_SAME_FORCE  18	/* force complete on same CPU */
+#define QUEUE_FLAG_EXP_DMPG    19	/* Expedite Demand paging requests */
+#define QUEUE_FLAG_EXP_SWAPIN  20	/* Expedit page swapping */
 
 #define QUEUE_FLAG_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
 				 (1 << QUEUE_FLAG_STACKABLE)	|	\
@@ -506,6 +508,12 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 #define blk_queue_secdiscard(q)	(blk_queue_discard(q) && \
 	test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
 
+#define blk_queue_exp_dmpg(q) \
+	test_bit(QUEUE_FLAG_EXP_DMPG, &(q)->queue_flags)
+
+#define blk_queue_exp_swapin(q) \
+	test_bit(QUEUE_FLAG_EXP_SWAPIN, &(q)->queue_flags)
+
 #define blk_noretry_request(rq) \
 	((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
 			     REQ_FAILFAST_DRIVER))
-- 
1.7.10.rc2

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