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@xxxxxx>
Signed-off-by: Ilan Smith <ilan.smith@xxxxxxxxxxx>
Signed-off-by: Alex Lemberg <alex.lemberg@xxxxxxxxxxx>
---
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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