Add blktrace and verify debug tracing

[fio.git] / blktrace.c

diff --git a/blktrace.c b/blktrace.c
index 629aebed84d7b40ebcb58942f1383a6a8b0bdfae..538bcd71b9091b02b558d362fafabc6b15b630c2 100644 (file)
--- a/blktrace.c
+++ b/blktrace.c
@@ -34,6 +34,7 @@ static int refill_fifo(struct thread_data *td, struct fifo *fifo, int fd)
        if (ret > 0)
                ret = fifo_put(fifo, buf, ret);
 
+       dprint(FD_BLKTRACE, "refill: filled %d bytes\n", ret);
        return ret;
 }
 
@@ -62,6 +63,7 @@ static int discard_pdu(struct thread_data *td, struct fifo *fifo, int fd,
        if (t->pdu_len == 0)
                return 0;
 
+       dprint(FD_BLKTRACE, "discard pdu len %u\n", t->pdu_len);
        return trace_fifo_get(td, fifo, fd, NULL, t->pdu_len);
 }
 
@@ -75,10 +77,8 @@ int is_blktrace(const char *filename)
        int fd, ret;
 
        fd = open(filename, O_RDONLY);
-       if (fd < 0) {
-               perror("open blktrace");
+       if (fd < 0)
                return 0;
-       }
 
        ret = read(fd, &t, sizeof(t));
        close(fd);
@@ -132,6 +132,7 @@ static int lookup_device(char *path, unsigned int maj, unsigned int min)
                        continue;
 
                if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) {
+                       dprint(FD_BLKTRACE, "device lookup: %d/%d\n", maj,min);
                        strcpy(path, full_path);
                        found = 1;
                        break;
@@ -142,16 +143,16 @@ static int lookup_device(char *path, unsigned int maj, unsigned int min)
        return found;
 }
 
-#define MINORBITS      20
-#define MINORMASK      ((1U << MINORBITS) - 1)
-#define MAJOR(dev)     ((unsigned int) ((dev) >> MINORBITS))
-#define MINOR(dev)     ((unsigned int) ((dev) & MINORMASK))
+#define FMINORBITS     20
+#define FMINORMASK     ((1U << FMINORBITS) - 1)
+#define FMAJOR(dev)    ((unsigned int) ((dev) >> FMINORBITS))
+#define FMINOR(dev)    ((unsigned int) ((dev) & FMINORMASK))
 
 static void trace_add_file(struct thread_data *td, __u32 device)
 {
        static unsigned int last_maj, last_min;
-       unsigned int maj = MAJOR(device);
-       unsigned int min = MINOR(device);
+       unsigned int maj = FMAJOR(device);
+       unsigned int min = FMINOR(device);
        struct fio_file *f;
        char dev[256];
        unsigned int i;
@@ -170,8 +171,10 @@ static void trace_add_file(struct thread_data *td, __u32 device)
                        return;
 
        strcpy(dev, "/dev");
-       if (lookup_device(dev, maj, min))
+       if (lookup_device(dev, maj, min)) {
+               dprint(FD_BLKTRACE, "add devices %s\n", dev);
                add_file(td, dev);
+       }
 }
 
 /*
@@ -195,6 +198,9 @@ static void store_ipo(struct thread_data *td, unsigned long long offset,
        else
                ipo->ddir = DDIR_READ;
 
+       dprint(FD_BLKTRACE, "store ddir=%d, off=%llu, len=%lu, delay=%lu\n",
+                                                       ipo->ddir, ipo->offset,
+                                                       ipo->len, ipo->delay);
        list_add_tail(&ipo->list, &td->io_log_list);
 }
 
@@ -235,7 +241,7 @@ int load_blktrace(struct thread_data *td, const char *filename)
 {
        unsigned long long ttime, delay;
        struct blk_io_trace t;
-       unsigned long ios[2];
+       unsigned long ios[2], skipped_writes;
        unsigned int cpu;
        unsigned int rw_bs[2];
        struct fifo *fifo;
@@ -255,6 +261,7 @@ int load_blktrace(struct thread_data *td, const char *filename)
        ttime = 0;
        ios[0] = ios[1] = 0;
        rw_bs[0] = rw_bs[1] = 0;
+       skipped_writes = 0;
        do {
                int ret = trace_fifo_get(td, fifo, fd, &t, sizeof(t));
 
@@ -283,6 +290,8 @@ int load_blktrace(struct thread_data *td, const char *filename)
                        log_err("fio: discarded %d of %d\n", ret, t.pdu_len);
                        goto err;
                }
+               if (t.action & BLK_TC_ACT(BLK_TC_NOTIFY))
+                       continue;
                if (!ttime) {
                        ttime = t.time;
                        cpu = t.cpu;
@@ -290,7 +299,10 @@ int load_blktrace(struct thread_data *td, const char *filename)
                delay = 0;
                if (cpu == t.cpu)
                        delay = t.time - ttime;
-               handle_trace(td, &t, delay, ios, rw_bs);
+               if ((t.action & BLK_TC_ACT(BLK_TC_WRITE)) && read_only)
+                       skipped_writes++;
+               else
+                       handle_trace(td, &t, delay, ios, rw_bs);
                ttime = t.time;
                cpu = t.cpu;
        } while (1);
@@ -298,6 +310,9 @@ int load_blktrace(struct thread_data *td, const char *filename)
        fifo_free(fifo);
        close(fd);
 
+       if (skipped_writes)
+               log_err("fio: <%s> skips replay of %lu writes due to read-only\n", td->o.name, skipped_writes);
+
        if (!ios[DDIR_READ] && !ios[DDIR_WRITE]) {
                log_err("fio: found no ios in blktrace data\n");
                return 1;