diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-09-25 23:32:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:48:58 -0700 |
| commit | 3a4f7577c9ef393ca80c783f02ffbc125de771c7 (patch) | |
| tree | 9b55b98309d0ac13e35db05379792d52b29a2345 /kernel/power | |
| parent | 930631edd4b1fe2781d9fe90edbe35d89dfc94cc (diff) | |
[PATCH] swsusp: add write-speed instrumentation
Add some instrumentation to the swsusp writeout code to show what bandwidth
we're achieving.
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/swap.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/kernel/power/swap.c b/kernel/power/swap.c index f1dd146bd64d..79b66e734bdb 100644 --- a/kernel/power/swap.c +++ b/kernel/power/swap.c @@ -146,6 +146,26 @@ static void release_swap_writer(struct swap_map_handle *handle) handle->bitmap = NULL; } +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); +} + static int get_swap_writer(struct swap_map_handle *handle) { handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); @@ -206,17 +226,21 @@ static int flush_swap_writer(struct swap_map_handle *handle) static int save_image(struct swap_map_handle *handle, struct snapshot_handle *snapshot, - unsigned int nr_pages) + unsigned int nr_to_write) { unsigned int m; int ret; int error = 0; + int nr_pages; + struct timeval start; + struct timeval stop; - printk("Saving image data pages (%u pages) ... ", nr_pages); - m = nr_pages / 100; + printk("Saving image data pages (%u pages) ... ", nr_to_write); + m = nr_to_write / 100; if (!m) m = 1; nr_pages = 0; + do_gettimeofday(&start); do { ret = snapshot_read_next(snapshot, PAGE_SIZE); if (ret > 0) { @@ -228,8 +252,10 @@ static int save_image(struct swap_map_handle *handle, nr_pages++; } } while (ret > 0); + do_gettimeofday(&stop); if (!error) printk("\b\b\b\bdone\n"); + show_speed(&start, &stop, nr_to_write, "Wrote"); return error; } |