More data printed

Makefile

@@ -6,11 +6,8 @@ CFLAGS=
 
 default: test
 
-%.0: %.c
-	$(CC) -c -o $@ $< $(CFLAGS)
-
 test: test.o 
-	gcc -lperfstat -o test test.o
+	$(CC) -lperfstat -o test test.o
 
 clean:
 	-rm -f test.o

test.c

@@ -15,8 +15,6 @@ int main(int argc, char* argv[]) {
         perfstat_disk_t *statp;
         perfstat_id_t first;
 
-    while(1) {
-
         /* check how many perfstat_disk_t structures are available */
         tot =  perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0);
 
@@ -30,6 +28,11 @@ int main(int argc, char* argv[]) {
                 exit(-1);
         }
 
+
+        long history[32][8];
+
+        while(1) {
+
                 /* allocate enough memory for all the structures */
                 statp = calloc(tot, sizeof(perfstat_disk_t));
 
@@ -46,15 +49,46 @@ int main(int argc, char* argv[]) {
                         exit(-1);
                 }
 
+
                 /* print statistics for each of the disks */
                 for (i = 0; i < ret; i++) {
-                printf("%s: %11u blocks of %11u bytes read, %11u blocks of %11u bytes written\n",
+                        
+                        unsigned long bsize = statp[i].bsize;   // Disk block size (in bytes).
+                        unsigned long rblks = statp[i].rblks;   // Number of blocks read from disk.
+                        unsigned long wblks = statp[i].wblks;   // Number of blocks written to disk.
+
+                        unsigned long rbytes = 0;
+                        if(rblks > 0) {
+                                rbytes = rblks * bsize;
+                        }
+
+                        unsigned long rdiff = 0;
+                        if(history[i][0] > 0) {
+                                rdiff = rbytes - history[i][0];
+                        }
+
+                        unsigned long wbytes = 0;
+                        if(wblks > 0) {
+                                wbytes = wblks * bsize;
+                        }
+
+                        unsigned long wdiff = 0;
+                        if(history[i][1] > 0) {
+                                wdiff = wbytes - history[i][1];
+                        }
+
+                        printf("%s => reads [ blocks: %10u, bytes %10u, diff %8u ], writes [ blocks: %10u, bytes: %10u, diff: %8u ]\n",
                                 statp[i].name,
-                        statp[i].rblks,
-                        statp[i].bsize,
-                        statp[i].wblks,
-                        statp[i].bsize
+                                rblks,
+                                rbytes,
+                                rdiff,
+                                wblks,
+                                wbytes,
+                                wdiff
                         );
+
+                        history[i][0] = rbytes;
+                        history[i][1] = wbytes;
                 }
 
                 sleep(10);