cfq-iosched: add message logging through blktrace

Now that blktrace has the ability to carry arbitrary messages in
its stream, use that for some CFQ logging.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 55 insertions, 10 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 32aa3674f8a3..0ebb626a25d3 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -11,6 +11,7 @@
 #include <linux/elevator.h>
 #include <linux/rbtree.h>
 #include <linux/ioprio.h>
+#include <linux/blktrace_api.h>
 
 /*
  * tunables
@@ -41,7 +42,7 @@ static int cfq_slice_idle = HZ / 125;
 
 #define RQ_CIC(rq)              \
         ((struct cfq_io_context *) (rq)->elevator_private)
-#define RQ_CFQQ(rq)             ((rq)->elevator_private2)
+#define RQ_CFQQ(rq)             (struct cfq_queue *) ((rq)->elevator_private2)
 
 static struct kmem_cache *cfq_pool;
 static struct kmem_cache *cfq_ioc_pool;
@@ -156,6 +157,7 @@ struct cfq_queue {
         unsigned short ioprio, org_ioprio;
         unsigned short ioprio_class, org_ioprio_class;
 
+        pid_t pid;
 };
 
 enum cfqq_state_flags {
@@ -199,6 +201,11 @@ CFQ_CFQQ_FNS(slice_new);
 CFQ_CFQQ_FNS(sync);
 #undef CFQ_CFQQ_FNS
 
+#define cfq_log_cfqq(cfqd, cfqq, fmt, args...)  \
+        blk_add_trace_msg((cfqd)->queue, "cfq%d " fmt, (cfqq)->pid, ##args)
+#define cfq_log(cfqd, fmt, args...)     \
+        blk_add_trace_msg((cfqd)->queue, "cfq " fmt, ##args)
+
 static void cfq_dispatch_insert(struct request_queue *, struct request *);
 static struct cfq_queue *cfq_get_queue(struct cfq_data *, int,
                                        struct io_context *, gfp_t);
@@ -235,8 +242,10 @@ static inline int cfq_bio_sync(struct bio *bio)
  */
 static inline void cfq_schedule_dispatch(struct cfq_data *cfqd)
 {
-        if (cfqd->busy_queues)
+        if (cfqd->busy_queues) {
+                cfq_log(cfqd, "schedule dispatch");
                 kblockd_schedule_work(&cfqd->unplug_work);
+        }
 }
 
 static int cfq_queue_empty(struct request_queue *q)
@@ -271,6 +280,7 @@ static inline void
 cfq_set_prio_slice(struct cfq_data *cfqd, struct cfq_queue *cfqq)
 {
         cfqq->slice_end = cfq_prio_to_slice(cfqd, cfqq) + jiffies;
+        cfq_log_cfqq(cfqd, cfqq, "set_slice=%lu", cfqq->slice_end - jiffies);
 }
 
 /*
@@ -540,6 +550,7 @@ static void cfq_resort_rr_list(struct cfq_data *cfqd, struct cfq_queue *cfqq)
  */
 static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
 {
+        cfq_log_cfqq(cfqd, cfqq, "add_to_rr");
         BUG_ON(cfq_cfqq_on_rr(cfqq));
         cfq_mark_cfqq_on_rr(cfqq);
         cfqd->busy_queues++;
@@ -553,6 +564,7 @@ static void cfq_add_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
  */
 static void cfq_del_cfqq_rr(struct cfq_data *cfqd, struct cfq_queue *cfqq)
 {
+        cfq_log_cfqq(cfqd, cfqq, "del_from_rr");
         BUG_ON(!cfq_cfqq_on_rr(cfqq));
         cfq_clear_cfqq_on_rr(cfqq);
 
@@ -639,6 +651,8 @@ static void cfq_activate_request(struct request_queue *q, struct request *rq)
         struct cfq_data *cfqd = q->elevator->elevator_data;
 
         cfqd->rq_in_driver++;
+        cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "activate rq, drv=%d",
+                                                cfqd->rq_in_driver);
 
         /*
          * If the depth is larger 1, it really could be queueing. But lets
@@ -658,6 +672,8 @@ static void cfq_deactivate_request(struct request_queue *q, struct request *rq)
 
         WARN_ON(!cfqd->rq_in_driver);
         cfqd->rq_in_driver--;
+        cfq_log_cfqq(cfqd, RQ_CFQQ(rq), "deactivate rq, drv=%d",
+                                                cfqd->rq_in_driver);
 }
 
 static void cfq_remove_request(struct request *rq)
@@ -747,6 +763,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
                                    struct cfq_queue *cfqq)
 {
         if (cfqq) {
+                cfq_log_cfqq(cfqd, cfqq, "set_active");
                 cfqq->slice_end = 0;
                 cfq_clear_cfqq_must_alloc_slice(cfqq);
                 cfq_clear_cfqq_fifo_expire(cfqq);
@@ -764,6 +781,8 @@ static void
 __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
                     int timed_out)
 {
+        cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out);
+
         if (cfq_cfqq_wait_request(cfqq))
                 del_timer(&cfqd->idle_slice_timer);
 
@@ -773,8 +792,10 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
         /*
          * store what was left of this slice, if the queue idled/timed out
          */
-        if (timed_out && !cfq_cfqq_slice_new(cfqq))
+        if (timed_out && !cfq_cfqq_slice_new(cfqq)) {
                 cfqq->slice_resid = cfqq->slice_end - jiffies;
+                cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid);
+        }
 
         cfq_resort_rr_list(cfqd, cfqq);
 
@@ -867,6 +888,12 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
                 return;
 
         /*
+         * still requests with the driver, don't idle
+         */
+        if (cfqd->rq_in_driver)
+                return;
+
+        /*
          * task has exited, don't wait
          */
         cic = cfqd->active_cic;
@@ -893,6 +920,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
                 sl = min(sl, msecs_to_jiffies(CFQ_MIN_TT));
 
         mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
+        cfq_log(cfqd, "arm_idle: %lu", sl);
 }
 
 /*
@@ -903,6 +931,8 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq)
         struct cfq_data *cfqd = q->elevator->elevator_data;
         struct cfq_queue *cfqq = RQ_CFQQ(rq);
 
+        cfq_log_cfqq(cfqd, cfqq, "dispatch_insert");
+
         cfq_remove_request(rq);
         cfqq->dispatched++;
         elv_dispatch_sort(q, rq);
@@ -932,8 +962,9 @@ static struct request *cfq_check_fifo(struct cfq_queue *cfqq)
         rq = rq_entry_fifo(cfqq->fifo.next);
 
         if (time_before(jiffies, rq->start_time + cfqd->cfq_fifo_expire[fifo]))
-                return NULL;
+                rq = NULL;
 
+        cfq_log_cfqq(cfqd, cfqq, "fifo=%p", rq);
         return rq;
 }
 
@@ -1073,6 +1104,7 @@ static int cfq_forced_dispatch(struct cfq_data *cfqd)
 
         BUG_ON(cfqd->busy_queues);
 
+        cfq_log(cfqd, "forced_dispatch=%d\n", dispatched);
         return dispatched;
 }
 
@@ -1113,6 +1145,7 @@ static int cfq_dispatch_requests(struct request_queue *q, int force)
                 dispatched += __cfq_dispatch_requests(cfqd, cfqq, max_dispatch);
         }
 
+        cfq_log(cfqd, "dispatched=%d", dispatched);
         return dispatched;
 }
 
@@ -1131,6 +1164,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
         if (!atomic_dec_and_test(&cfqq->ref))
                 return;
 
+        cfq_log_cfqq(cfqd, cfqq, "put_queue");
         BUG_ON(rb_first(&cfqq->sort_list));
         BUG_ON(cfqq->allocated[READ] + cfqq->allocated[WRITE]);
         BUG_ON(cfq_cfqq_on_rr(cfqq));
@@ -1439,6 +1473,8 @@ retry:
                                 cfq_mark_cfqq_idle_window(cfqq);
                         cfq_mark_cfqq_sync(cfqq);
                 }
+                cfqq->pid = current->pid;
+                cfq_log_cfqq(cfqd, cfqq, "alloced");
         }
 
         if (new_cfqq)
@@ -1687,7 +1723,7 @@ static void
 cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
                        struct cfq_io_context *cic)
 {
-        int enable_idle;
+        int old_idle, enable_idle;
 
         /*
          * Don't idle for async or idle io prio class
@@ -1695,7 +1731,7 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
         if (!cfq_cfqq_sync(cfqq) || cfq_class_idle(cfqq))
                 return;
 
-        enable_idle = cfq_cfqq_idle_window(cfqq);
+        old_idle = cfq_cfqq_idle_window(cfqq);
 
         if (!atomic_read(&cic->ioc->nr_tasks) || !cfqd->cfq_slice_idle ||
             (cfqd->hw_tag && CIC_SEEKY(cic)))
@@ -1707,10 +1743,13 @@ cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
                         enable_idle = 1;
         }
 
-        if (enable_idle)
-                cfq_mark_cfqq_idle_window(cfqq);
-        else
-                cfq_clear_cfqq_idle_window(cfqq);
+        if (old_idle != enable_idle) {
+                cfq_log_cfqq(cfqd, cfqq, "idle=%d", enable_idle);
+                if (enable_idle)
+                        cfq_mark_cfqq_idle_window(cfqq);
+                else
+                        cfq_clear_cfqq_idle_window(cfqq);
+        }
 }
 
 /*
@@ -1769,6 +1808,7 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
  */
 static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
 {
+        cfq_log_cfqq(cfqd, cfqq, "preempt");
         cfq_slice_expired(cfqd, 1);
 
         /*
@@ -1830,6 +1870,7 @@ static void cfq_insert_request(struct request_queue *q, struct request *rq)
         struct cfq_data *cfqd = q->elevator->elevator_data;
         struct cfq_queue *cfqq = RQ_CFQQ(rq);
 
+        cfq_log_cfqq(cfqd, cfqq, "insert_request");
         cfq_init_prio_data(cfqq, RQ_CIC(rq)->ioc);
 
         cfq_add_rq_rb(rq);
@@ -1847,6 +1888,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
         unsigned long now;
 
         now = jiffies;
+        cfq_log_cfqq(cfqd, cfqq, "complete");
 
         WARN_ON(!cfqd->rq_in_driver);
         WARN_ON(!cfqq->dispatched);
@@ -2016,6 +2058,7 @@ queue_fail:
 
         cfq_schedule_dispatch(cfqd);
         spin_unlock_irqrestore(q->queue_lock, flags);
+        cfq_log(cfqd, "set_request fail");
         return 1;
 }
 
@@ -2041,6 +2084,8 @@ static void cfq_idle_slice_timer(unsigned long data)
         unsigned long flags;
         int timed_out = 1;
 
+        cfq_log(cfqd, "idle timer fired");
+
         spin_lock_irqsave(cfqd->queue->queue_lock, flags);
 
         cfqq = cfqd->active_queue;