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Date: Sat, 25 Sep 2010 14:16:43 +1000
From: Nigel Cunningham <nigel@...onice.net>
To: "Rafael J. Wysocki" <rjw@...k.pl>,
Linux PM <linux-pm@...ts.linux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
TuxOnIce-devel <tuxonice-devel@...onice.net>
Subject: [PATCH 01/22] Record & display i/o speed post resume.
Record the speed at which the image is written and read, and
display it to the user post-resume.
Signed-off-by: Nigel Cunningham <nigel@...onice.net>
---
kernel/power/hibernate.c | 11 ++++++++++-
kernel/power/power.h | 4 +++-
kernel/power/swap.c | 14 +++++++++++---
3 files changed, 24 insertions(+), 5 deletions(-)
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 8dc31e0..8cd0bbc 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -211,7 +211,7 @@ static void platform_recover(int platform_mode)
* @msg - introductory message to print
*/
-void swsusp_show_speed(struct timeval *start, struct timeval *stop,
+int swsusp_show_speed(struct timeval *start, struct timeval *stop,
unsigned nr_pages, char *msg)
{
s64 elapsed_centisecs64;
@@ -230,6 +230,7 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
msg, k,
centisecs / 100, centisecs % 100,
kps / 1000, (kps % 1000) / 10);
+ return kps / 1000;
}
/**
@@ -645,6 +646,14 @@ int hibernate(void)
power_down();
} else {
pr_debug("PM: Image restored successfully.\n");
+ if (write_speed)
+ pr_debug("PM: Image written at %u MB/s.\n",
+ (u8) write_speed);
+ write_speed = 0;
+ if (read_speed)
+ pr_debug("PM: Image read at %u MB/s.\n",
+ (u8) read_speed);
+ read_speed = 0;
}
Thaw:
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 006270f..67b6896 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -49,6 +49,8 @@ static inline char *check_image_kernel(struct swsusp_info *info)
extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);
+
+extern char __nosavedata write_speed, read_speed;
#endif
extern int pfn_is_nosave(unsigned long);
@@ -153,7 +155,7 @@ extern int hib_wait_on_bio_chain(struct bio **bio_chain);
struct timeval;
/* kernel/power/swsusp.c */
-extern void swsusp_show_speed(struct timeval *, struct timeval *,
+extern int swsusp_show_speed(struct timeval *, struct timeval *,
unsigned int, char *);
#ifdef CONFIG_SUSPEND
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index e6a5bdf..728f85b 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -64,7 +64,8 @@ struct swap_map_handle {
};
struct swsusp_header {
- char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)];
+ char reserved[PAGE_SIZE - 21 - sizeof(sector_t) - sizeof(int)];
+ char write_speed;
sector_t image;
unsigned int flags; /* Flags to pass to the "boot" kernel */
char orig_sig[10];
@@ -180,6 +181,7 @@ int swsusp_swap_in_use(void)
static unsigned short root_swap = 0xffff;
struct block_device *hib_resume_bdev;
+char __nosavedata write_speed, read_speed;
/*
* Saving part
@@ -194,6 +196,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
!memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
+ swsusp_header->write_speed = write_speed;
swsusp_header->image = handle->first_sector;
swsusp_header->flags = flags;
error = hib_bio_write_page(swsusp_resume_block,
@@ -372,6 +375,7 @@ static int save_image(struct swap_map_handle *handle,
struct bio *bio;
struct timeval start;
struct timeval stop;
+ int mps;
printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ",
nr_to_write);
@@ -400,7 +404,8 @@ static int save_image(struct swap_map_handle *handle,
printk(KERN_CONT "\b\b\b\bdone\n");
else
printk(KERN_CONT "\n");
- swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
+ mps = swsusp_show_speed(&start, &stop, nr_to_write, "Wrote");
+ write_speed = (mps < 256) ? (char) mps : 0;
return ret;
}
@@ -550,6 +555,7 @@ static int load_image(struct swap_map_handle *handle,
struct bio *bio;
int err2;
unsigned nr_pages;
+ int mps;
printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ",
nr_to_read);
@@ -585,7 +591,8 @@ static int load_image(struct swap_map_handle *handle,
error = -ENODATA;
} else
printk("\n");
- swsusp_show_speed(&start, &stop, nr_to_read, "Read");
+ mps = swsusp_show_speed(&start, &stop, nr_to_read, "Read");
+ read_speed = (mps < 256) ? mps : 0;
return error;
}
@@ -641,6 +648,7 @@ int swsusp_check(void)
goto put;
if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) {
+ write_speed = swsusp_header->write_speed;
memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
/* Reset swap signature now */
error = hib_bio_write_page(swsusp_resume_block,
--
1.7.0.4
--
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