summaryrefslogtreecommitdiffstats
path: root/block/mq-deadline.c
diff options
context:
space:
mode:
authorOmar Sandoval <osandov@fb.com>2017-05-04 00:31:34 -0700
committerJens Axboe <axboe@fb.com>2017-05-04 08:25:17 -0600
commitdaaadb3e9453ab89c2e113a2d1df8e19e30944cc (patch)
tree4a72782bd1b32dd4b0757e993644ff98b7cbc9d5 /block/mq-deadline.c
parent16b738f651c83a01db057e5db02ec4b830af9130 (diff)
downloadlinux-0-day-daaadb3e9453ab89c2e113a2d1df8e19e30944cc.tar.gz
mq-deadline: add debugfs attributes
Expose the fifo lists, cached next requests, batching state, and dispatch list. It'd also be possible to add the sorted lists, but there aren't already seq_file helpers for rbtrees. Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/mq-deadline.c')
-rw-r--r--block/mq-deadline.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/block/mq-deadline.c b/block/mq-deadline.c
index 23612163..1b964a3 100644
--- a/block/mq-deadline.c
+++ b/block/mq-deadline.c
@@ -19,6 +19,7 @@
#include "blk.h"
#include "blk-mq.h"
+#include "blk-mq-debugfs.h"
#include "blk-mq-tag.h"
#include "blk-mq-sched.h"
@@ -517,6 +518,125 @@ static struct elv_fs_entry deadline_attrs[] = {
__ATTR_NULL
};
+#ifdef CONFIG_BLK_DEBUG_FS
+#define DEADLINE_DEBUGFS_DDIR_ATTRS(ddir, name) \
+static void *deadline_##name##_fifo_start(struct seq_file *m, \
+ loff_t *pos) \
+ __acquires(&dd->lock) \
+{ \
+ struct request_queue *q = m->private; \
+ struct deadline_data *dd = q->elevator->elevator_data; \
+ \
+ spin_lock(&dd->lock); \
+ return seq_list_start(&dd->fifo_list[ddir], *pos); \
+} \
+ \
+static void *deadline_##name##_fifo_next(struct seq_file *m, void *v, \
+ loff_t *pos) \
+{ \
+ struct request_queue *q = m->private; \
+ struct deadline_data *dd = q->elevator->elevator_data; \
+ \
+ return seq_list_next(v, &dd->fifo_list[ddir], pos); \
+} \
+ \
+static void deadline_##name##_fifo_stop(struct seq_file *m, void *v) \
+ __releases(&dd->lock) \
+{ \
+ struct request_queue *q = m->private; \
+ struct deadline_data *dd = q->elevator->elevator_data; \
+ \
+ spin_unlock(&dd->lock); \
+} \
+ \
+static const struct seq_operations deadline_##name##_fifo_seq_ops = { \
+ .start = deadline_##name##_fifo_start, \
+ .next = deadline_##name##_fifo_next, \
+ .stop = deadline_##name##_fifo_stop, \
+ .show = blk_mq_debugfs_rq_show, \
+}; \
+ \
+static int deadline_##name##_next_rq_show(void *data, \
+ struct seq_file *m) \
+{ \
+ struct request_queue *q = data; \
+ struct deadline_data *dd = q->elevator->elevator_data; \
+ struct request *rq = dd->next_rq[ddir]; \
+ \
+ if (rq) \
+ __blk_mq_debugfs_rq_show(m, rq); \
+ return 0; \
+}
+DEADLINE_DEBUGFS_DDIR_ATTRS(READ, read)
+DEADLINE_DEBUGFS_DDIR_ATTRS(WRITE, write)
+#undef DEADLINE_DEBUGFS_DDIR_ATTRS
+
+static int deadline_batching_show(void *data, struct seq_file *m)
+{
+ struct request_queue *q = data;
+ struct deadline_data *dd = q->elevator->elevator_data;
+
+ seq_printf(m, "%u\n", dd->batching);
+ return 0;
+}
+
+static int deadline_starved_show(void *data, struct seq_file *m)
+{
+ struct request_queue *q = data;
+ struct deadline_data *dd = q->elevator->elevator_data;
+
+ seq_printf(m, "%u\n", dd->starved);
+ return 0;
+}
+
+static void *deadline_dispatch_start(struct seq_file *m, loff_t *pos)
+ __acquires(&dd->lock)
+{
+ struct request_queue *q = m->private;
+ struct deadline_data *dd = q->elevator->elevator_data;
+
+ spin_lock(&dd->lock);
+ return seq_list_start(&dd->dispatch, *pos);
+}
+
+static void *deadline_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct request_queue *q = m->private;
+ struct deadline_data *dd = q->elevator->elevator_data;
+
+ return seq_list_next(v, &dd->dispatch, pos);
+}
+
+static void deadline_dispatch_stop(struct seq_file *m, void *v)
+ __releases(&dd->lock)
+{
+ struct request_queue *q = m->private;
+ struct deadline_data *dd = q->elevator->elevator_data;
+
+ spin_unlock(&dd->lock);
+}
+
+static const struct seq_operations deadline_dispatch_seq_ops = {
+ .start = deadline_dispatch_start,
+ .next = deadline_dispatch_next,
+ .stop = deadline_dispatch_stop,
+ .show = blk_mq_debugfs_rq_show,
+};
+
+#define DEADLINE_QUEUE_DDIR_ATTRS(name) \
+ {#name "_fifo_list", 0400, .seq_ops = &deadline_##name##_fifo_seq_ops}, \
+ {#name "_next_rq", 0400, deadline_##name##_next_rq_show}
+static const struct blk_mq_debugfs_attr deadline_queue_debugfs_attrs[] = {
+ DEADLINE_QUEUE_DDIR_ATTRS(read),
+ DEADLINE_QUEUE_DDIR_ATTRS(write),
+ {"batching", 0400, deadline_batching_show},
+ {"starved", 0400, deadline_starved_show},
+ {"dispatch", 0400, .seq_ops = &deadline_dispatch_seq_ops},
+ {},
+};
+#undef DEADLINE_QUEUE_DDIR_ATTRS
+#endif
+
static struct elevator_type mq_deadline = {
.ops.mq = {
.insert_requests = dd_insert_requests,
@@ -533,6 +653,9 @@ static struct elevator_type mq_deadline = {
},
.uses_mq = true,
+#ifdef CONFIG_BLK_DEBUG_FS
+ .queue_debugfs_attrs = deadline_queue_debugfs_attrs,
+#endif
.elevator_attrs = deadline_attrs,
.elevator_name = "mq-deadline",
.elevator_owner = THIS_MODULE,