[PATCH V2 09/13] blk-throttle: add trace for new proporation throttle

[Shaohua Li]

The trace log is very helpful to track bug and performance issues.

Signed-off-by: Shaohua Li <s...@fb.com>
---
 block/blk-throttle.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 01ca04e..68e2598 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1153,6 +1153,7 @@ static void tg_update_share(struct throtl_data *td, 
struct throtl_grp *tg)
                        sq->parent_sq->share * sq->acting_weight /
                                sq->parent_sq->children_weight,
                        1);
+               throtl_log(sq, "new share=%u", sq->share);
        }
 }
 
@@ -1168,6 +1169,8 @@ static void tg_update_active_time(struct throtl_grp *tg)
                        sq->acting_weight = sq->weight;
                        sq->parent_sq->children_weight += sq->acting_weight;
                        tg = sq_to_tg(sq);
+                       throtl_log(sq, "active weight=%u parent_weight=%u",
+                               sq->acting_weight, 
sq->parent_sq->children_weight);
                }
                sq = sq->parent_sq;
        }
@@ -1206,6 +1209,8 @@ static void detect_inactive_cg(struct throtl_grp *tg)
                                sq->parent_sq->children_weight -= 
sq->acting_weight;
                                sq->acting_weight = 0;
                                update_share = true;
+                               throtl_log(sq, "inactive weight=%u 
parent_weight=%u",
+                                       sq->weight, 
sq->parent_sq->children_weight);
                        }
                }
        }
@@ -1621,6 +1626,10 @@ static void __tg_set_weight(struct throtl_grp *tg, 
unsigned int weight)
                        psq->children_weight -= old_weight - weight;
                tg->service_queue.acting_weight = weight;
        }
+       throtl_log(&tg->service_queue, "weight=%d parent_weight=%d",
+               tg->service_queue.acting_weight,
+               tg->service_queue.parent_sq ?
+                       tg->service_queue.parent_sq->children_weight : 0);
 
        tg_update_share(tg->td, tg);
 }
-- 
2.6.5