[PATCH] blkparse: allow tracking of Queue -> Complete time for md/dm

For remapper devices, we want to track the Queue -> Complete cycle,
as that is all we have the option of doing there.

diff --git a/blkparse.c b/blkparse.c
index 2b385b690addc85c745a2014dcb34522f1a6ddb5..4823401a02afb26efecefc6910d249bce4d18ba7 100644 (file)
--- a/blkparse.c
+++ b/blkparse.c
@@ -840,6 +840,30 @@ static void log_track_getrq(struct per_dev_info *pdi, struct blk_io_trace *t)
        iot->allocation_time = t->time;
 }
 
+static inline int is_remapper(struct per_dev_info *pdi)
+{
+       int major = MAJOR(pdi->dev);
+
+       return (major == 253 || major == 9);
+}
+
+/*
+ * for md/dm setups, the interesting cycle is Q -> C. So track queueing
+ * time here, as dispatch time
+ */
+static void log_track_queue(struct per_dev_info *pdi, struct blk_io_trace *t)
+{
+       struct io_track *iot;
+
+       if (!track_ios)
+               return;
+       if (!is_remapper(pdi))
+               return;
+
+       iot = find_track(pdi, t->pid, t->comm, t->sector);
+       iot->dispatch_time = t->time;
+}
+
 /*
  * return time between rq allocation and insertion
  */
@@ -919,8 +943,6 @@ static unsigned long long log_track_complete(struct per_dev_info *pdi,
 
        if (!track_ios)
                return -1;
-       if ((t->action & BLK_TC_ACT(BLK_TC_FS)) == 0)
-               return -1;
 
        iot = __find_track(pdi, t->sector);
        if (!iot) {
@@ -1229,6 +1251,7 @@ static void dump_trace_fs(struct blk_io_trace *t, struct per_dev_info *pdi,
 
        switch (act) {
                case __BLK_TA_QUEUE:
+                       log_track_queue(pdi, t);
                        account_queue(t, pci, w);
                        log_queue(pci, t, "Q");
                        break;