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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2007-10-18 03:04:49 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-18 14:37:19 -0700 |
| commit | 438e2ce68dfd4af4cfcec2f873564fb921db4bb5 (patch) | |
| tree | 685262ee1f983001db52df4253548f03d98dd33f /kernel/power/process.c | |
| parent | b842ee578eeb2c10303725e28edca130ede0397c (diff) | |
| download | linux-438e2ce68dfd4af4cfcec2f873564fb921db4bb5.tar.gz linux-438e2ce68dfd4af4cfcec2f873564fb921db4bb5.tar.bz2 linux-438e2ce68dfd4af4cfcec2f873564fb921db4bb5.zip | |
freezer: measure freezing time
Measure the time of the freezing of tasks, even if it doesn't fail.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power/process.c')
| -rw-r--r-- | kernel/power/process.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c index 3d98d7f99b14..6533923e711b 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -168,6 +168,11 @@ static int try_to_freeze_tasks(int freeze_user_space) struct task_struct *g, *p; unsigned long end_time; unsigned int todo; + struct timeval start, end; + s64 elapsed_csecs64; + unsigned int elapsed_csecs; + + do_gettimeofday(&start); end_time = jiffies + TIMEOUT; do { @@ -194,6 +199,11 @@ static int try_to_freeze_tasks(int freeze_user_space) break; } while (todo); + do_gettimeofday(&end); + elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start); + do_div(elapsed_csecs64, NSEC_PER_SEC / 100); + elapsed_csecs = elapsed_csecs64; + if (todo) { /* This does not unfreeze processes that are already frozen * (we have slightly ugly calling convention in that respect, @@ -201,10 +211,9 @@ static int try_to_freeze_tasks(int freeze_user_space) * but it cleans up leftover PF_FREEZE requests. */ printk("\n"); - printk(KERN_ERR "Freezing of %s timed out after %d seconds " + printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds " "(%d tasks refusing to freeze):\n", - freeze_user_space ? "user space " : "tasks ", - TIMEOUT / HZ, todo); + elapsed_csecs / 100, elapsed_csecs % 100, todo); show_state(); read_lock(&tasklist_lock); do_each_thread(g, p) { @@ -215,6 +224,9 @@ static int try_to_freeze_tasks(int freeze_user_space) task_unlock(p); } while_each_thread(g, p); read_unlock(&tasklist_lock); + } else { + printk("(elapsed %d.%02d seconds) ", elapsed_csecs / 100, + elapsed_csecs % 100); } return todo ? -EBUSY : 0; |