diff --git a/blk_kprobe.c b/blk_kprobe.c
index 5403394..1cb68c1 100644
--- a/blk_kprobe.c
+++ b/blk_kprobe.c
@@ -4,6 +4,7 @@
 #include <linux/bio.h>
 #include <linux/bvec.h>
 #include <linux/blkdev.h>
+#include <linux/blk-mq.h>
 
 static int submit_bio_pre(struct kprobe *p, struct pt_regs *regs) {
     struct bio *bio = (struct bio *)regs->di;
@@ -16,9 +17,6 @@ static int submit_bio_pre(struct kprobe *p, struct pt_regs *regs) {
                iter.bi_idx, iter.bi_sector, iter.bi_size, iter.bi_bvec_done, (unsigned long)bvec.bv_page, bvec.bv_len, bvec.bv_offset);
     }
 
-    if (bio->bi_vcnt != 1)
-    	dump_stack();
-
     return 0;
 }
 
@@ -27,8 +25,22 @@ static struct kprobe submit_bio_kp = {
     .pre_handler = submit_bio_pre,
 };
 
+static int blk_mq_start_request_pre(struct kprobe *p, struct pt_regs *regs) {
+    struct request *rq = (struct request *)regs->di;
+
+    printk(KERN_INFO "tag is %d, internal_tag is %d, sector is %lld, bytes is %d, nr_phys_segments is %d\n", rq->tag, rq->internal_tag, blk_rq_pos(rq), blk_rq_bytes(rq), rq->nr_phys_segments);
+
+    return 0;
+}
+
+static struct kprobe blk_mq_start_request_kp = {
+    .symbol_name = "blk_mq_start_request",
+    .pre_handler = blk_mq_start_request_pre,
+};
+
 static struct kprobe *kprobes[] = {
     &submit_bio_kp,
+    &blk_mq_start_request_kp,
 };
 
 static int __init kprobe_init(void) {