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Commit 438e2ce6 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki Committed by Linus Torvalds
Browse files

freezer: measure freezing time 



Measure the time of the freezing of tasks, even if it doesn't fail.

Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b842ee57

kernel/power/process.c

+15 −3
Original line number Diff line number Diff line
@@ -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;