perf top: Add overwrite fall back

[linux-2.6-microblaze.git] / block / blk-wbt.c

diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index b252da0..f92fc84 100644 (file)
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -178,12 +178,11 @@ void wbt_done(struct rq_wb *rwb, struct blk_issue_stat *stat)
 
                if (wbt_is_read(stat))
                        wb_timestamp(rwb, &rwb->last_comp);
-               wbt_clear_state(stat);
        } else {
                WARN_ON_ONCE(stat == rwb->sync_cookie);
                __wbt_done(rwb, wbt_stat_to_mask(stat));
-               wbt_clear_state(stat);
        }
+       wbt_clear_state(stat);
 }
 
 /*
@@ -482,7 +481,7 @@ static inline unsigned int get_limit(struct rq_wb *rwb, unsigned long rw)
 
        /*
         * At this point we know it's a buffered write. If this is
-        * kswapd trying to free memory, or REQ_SYNC is set, set, then
+        * kswapd trying to free memory, or REQ_SYNC is set, then
         * it's WB_SYNC_ALL writeback, and we'll use the max limit for
         * that. If the write is marked as a background write, then use
         * the idle limit, or go to normal if we haven't had competing
@@ -698,7 +697,15 @@ u64 wbt_default_latency_nsec(struct request_queue *q)
 
 static int wbt_data_dir(const struct request *rq)
 {
-       return rq_data_dir(rq);
+       const int op = req_op(rq);
+
+       if (op == REQ_OP_READ)
+               return READ;
+       else if (op == REQ_OP_WRITE || op == REQ_OP_FLUSH)
+               return WRITE;
+
+       /* don't account */
+       return -1;
 }
 
 int wbt_init(struct request_queue *q)
@@ -723,8 +730,6 @@ int wbt_init(struct request_queue *q)
                init_waitqueue_head(&rwb->rq_wait[i].wait);
        }
 
-       rwb->wc = 1;
-       rwb->queue_depth = RWB_DEF_DEPTH;
        rwb->last_comp = rwb->last_issue = jiffies;
        rwb->queue = q;
        rwb->win_nsec = RWB_WINDOW_NSEC;