From 0d3a9abe8ae055e1052295698bcd0722c92eff47 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 6 Dec 2006 20:34:32 -0800 Subject: [PATCH] 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 Cc: Pavel Machek Cc: Nigel Cunningham Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/power/power.h | 4 ++++ kernel/power/swap.c | 24 ++---------------------- kernel/power/swsusp.c | 33 +++++++++++++++++++++++++++++++++ 3 files changed, 39 insertions(+), 22 deletions(-) (limited to 'kernel/power') diff --git a/kernel/power/power.h b/kernel/power/power.h index 3763343bde2f..3afa5dbe6bc5 100644 --- a/kernel/power/power.h +++ b/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 *); diff --git a/kernel/power/swap.c b/kernel/power/swap.c index 52e70ca832a8..dedf8797b723 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -133,26 +133,6 @@ static int wait_on_bio_chain(struct bio **bio_chain) 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_handle *handle, 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_handle *handle, 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; } diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c index 68de5c1dbd78..aa31432bbd97 100644 --- a/kernel/power/swsusp.c +++ b/kernel/power/swsusp.c @@ -49,6 +49,7 @@ #include #include #include +#include #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; } -- cgit v1.2.3