[PATCH] swsusp: Measure memory shrinking time

[powerpc.git] / kernel / power / swsusp.c

diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 68de5c1..aa31432 100644 (file)
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -49,6 +49,7 @@
 #include <linux/bootmem.h>
 #include <linux/syscalls.h>
 #include <linux/highmem.h>
+#include <linux/time.h>
 
 #include "power.h"
 
@@ -163,6 +164,34 @@ void free_all_swap_pages(int swap, struct bitmap_page *bitmap)
        }
 }
 
+/**
+ *     swsusp_show_speed - print the time elapsed between two events represented by
+ *     @start and @stop
+ *
+ *     @nr_pages -     number of pages processed between @start and @stop
+ *     @msg -          introductory message to print
+ */
+
+void swsusp_show_speed(struct timeval *start, struct timeval *stop,
+                       unsigned nr_pages, char *msg)
+{
+       s64 elapsed_centisecs64;
+       int centisecs;
+       int k;
+       int kps;
+
+       elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
+       do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
+       centisecs = elapsed_centisecs64;
+       if (centisecs == 0)
+               centisecs = 1;  /* avoid div-by-zero */
+       k = nr_pages * (PAGE_SIZE / 1024);
+       kps = (k * 100) / centisecs;
+       printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
+                       centisecs / 100, centisecs % 100,
+                       kps / 1000, (kps % 1000) / 10);
+}
+
 /**
  *     swsusp_shrink_memory -  Try to free as much memory as needed
  *
@@ -187,8 +216,10 @@ int swsusp_shrink_memory(void)
        unsigned long pages = 0;
        unsigned int i = 0;
        char *p = "-\\|/";
+       struct timeval start, stop;
 
        printk("Shrinking memory...  ");
+       do_gettimeofday(&start);
        do {
                long size, highmem_size;
 
@@ -222,7 +253,9 @@ int swsusp_shrink_memory(void)
                }
                printk("\b%c", p[i++%4]);
        } while (tmp > 0);
+       do_gettimeofday(&stop);
        printk("\bdone (%lu pages freed)\n", pages);
+       swsusp_show_speed(&start, &stop, pages, "Freed");
 
        return 0;
 }