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authorRafael J. Wysocki <rjw@sisk.pl>2012-02-11 00:00:34 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2012-02-13 16:26:05 +0100
commit6c83b4818dd65eb17e633b6b629a81da7bed90b3 (patch)
tree97eddcc6d07daf0ea1be84c57e7a687b3d406151 /kernel/power/process.c
parent7c95149b7f1f61201b12c73c4862a41bf2428961 (diff)
downloadlinux-6c83b4818dd65eb17e633b6b629a81da7bed90b3.tar.bz2
PM / Sleep: Do not check wakeup too often in try_to_freeze_tasks()
Use the observation that it is more efficient to check the wakeup variable once before the loop reporting tasks that were not frozen in try_to_freeze_tasks() than to do that in every step of that loop. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'kernel/power/process.c')
-rw-r--r--kernel/power/process.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 7e426459e60a..6aeb5efe00eb 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -98,13 +98,15 @@ static int try_to_freeze_tasks(bool user_only)
elapsed_csecs / 100, elapsed_csecs % 100,
todo - wq_busy, wq_busy);
- read_lock(&tasklist_lock);
- do_each_thread(g, p) {
- if (!wakeup && !freezer_should_skip(p) &&
- p != current && freezing(p) && !frozen(p))
- sched_show_task(p);
- } while_each_thread(g, p);
- read_unlock(&tasklist_lock);
+ if (!wakeup) {
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p) {
+ if (p != current && !freezer_should_skip(p)
+ && freezing(p) && !frozen(p))
+ sched_show_task(p);
+ } while_each_thread(g, p);
+ read_unlock(&tasklist_lock);
+ }
} else {
printk("(elapsed %d.%02d seconds) ", elapsed_csecs / 100,
elapsed_csecs % 100);