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Message-Id: <200611041131.40323.rjw@sisk.pl>
Date: Sat, 4 Nov 2006 11:31:39 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Andrew Morton <akpm@...l.org>
Cc: Pavel Machek <pavel@....cz>, LKML <linux-kernel@...r.kernel.org>,
Stefan Seyfried <seife@...e.de>
Subject: [PATCH -mm] swsusp: Measure memory shrinking time
Make swsusp measure and print the time needed to shrink memory during the
suspend.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
kernel/power/power.h | 4 ++++
kernel/power/swap.c | 24 ++----------------------
kernel/power/swsusp.c | 33 +++++++++++++++++++++++++++++++++
3 files changed, 39 insertions(+), 22 deletions(-)
Index: linux-2.6.19-rc4-mm2/kernel/power/power.h
===================================================================
--- linux-2.6.19-rc4-mm2.orig/kernel/power/power.h
+++ linux-2.6.19-rc4-mm2/kernel/power/power.h
@@ -171,3 +171,7 @@ extern int swsusp_read(void);
extern int swsusp_write(void);
extern void swsusp_close(void);
extern int suspend_enter(suspend_state_t state);
+
+struct timeval;
+extern void swsusp_show_speed(struct timeval *, struct timeval *,
+ unsigned int, char *);
Index: linux-2.6.19-rc4-mm2/kernel/power/swap.c
===================================================================
--- linux-2.6.19-rc4-mm2.orig/kernel/power/swap.c
+++ linux-2.6.19-rc4-mm2/kernel/power/swap.c
@@ -133,26 +133,6 @@ static int wait_on_bio_chain(struct bio
return ret;
}
-static void 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);
-}
-
/*
* Saving part
*/
@@ -375,7 +355,7 @@ static int save_image(struct swap_map_ha
error = err2;
if (!error)
printk("\b\b\b\bdone\n");
- show_speed(&start, &stop, nr_to_write, "Wrote");
+ swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
return error;
}
@@ -562,7 +542,7 @@ static int load_image(struct swap_map_ha
if (!snapshot_image_loaded(snapshot))
error = -ENODATA;
}
- show_speed(&start, &stop, nr_to_read, "Read");
+ swsusp_show_speed(&start, &stop, nr_to_read, "Read");
return error;
}
Index: linux-2.6.19-rc4-mm2/kernel/power/swsusp.c
===================================================================
--- linux-2.6.19-rc4-mm2.orig/kernel/power/swsusp.c
+++ linux-2.6.19-rc4-mm2/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"
@@ -164,6 +165,34 @@ void free_all_swap_pages(int swap, struc
}
/**
+ * 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
*
* ... but do not OOM-kill anyone
@@ -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;
}
-
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