+
+#Gather settings
+log_file=data
+gather_delay=1
+
+done_file=plot_done
+
+# Plot settings
+trunc_file=trunc_data
+plot_samples=1000
+plot_delay=2
+
+
+
+
+
+# Gathering task
+
+gather_data() {
+i=0;
+rm -f $log_file
+
+while [ ! -e $done_file ] ; do
+ erased_blocks=$(cat /proc/yaffs | grep n_erased_blocks | cut -d ' ' -f 2)
+ free_chunks=$(cat /proc/yaffs | grep n_free_chunks | cut -d ' ' -f 2)
+
+ erased_chunks=$(($erased_blocks*64))
+ str=" $i, 0, $free_chunks, $erased_chunks"
+ echo $str
+ echo $str >> $log_file
+ i=$(($i+1))
+ sleep $gather_delay
+done
+}
+
+
+# Plotting task
+# Periodically creates a truncated version of the log file and
+# outputs commands into gnuplot, thus driving gnuplot
+
+drive_gnuplot(){
+sleep 5
+tail -$plot_samples $log_file > $trunc_file
+
+plot_str=" plot '$trunc_file' using 1:3 with linespoints title 'free', '' using 1:4 with linespoints title 'erased'"
+
+echo "set title 'yaffs free space vs erased space'"
+echo "set xlabel 'seconds'"
+echo "set ylabel 'chunks'"
+
+
+echo $plot_str
+
+while [ ! -e $done_file ]; do
+sleep $plot_delay
+tail -$plot_samples $log_file > $trunc_file
+echo replot
+done
+}
+
+
+rm -f $done_file
+trap "touch $done_file" INT
+
+echo "Start gathering task in background"
+gather_data &
+echo "Run plotting task"
+drive_gnuplot | gnuplot
+
+wait
+
+echo "All done"