sync_supers task currently wakes up periodically for superblock writeback. This hurts power on battery driven devices. This patch turns this housekeeping timer into a deferable timer so that it does not fire when system is really idle. Signed-off-by: Yong Wang <yong.y.wang@xxxxxxxxx> Signed-off-by: Xia Wu <xia.wu@xxxxxxxxx> --- mm/backing-dev.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 65d4204..9a8daa5 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -238,7 +238,9 @@ static int __init default_bdi_init(void) sync_supers_tsk = kthread_run(bdi_sync_supers, NULL, "sync_supers"); BUG_ON(IS_ERR(sync_supers_tsk)); - setup_timer(&sync_supers_timer, sync_supers_timer_fn, 0); + init_timer_deferrable(&sync_supers_timer); + sync_supers_timer.function = sync_supers_timer_fn; + sync_supers_timer.data = 0; bdi_arm_supers_timer(); err = bdi_init(&default_backing_dev_info); -- 1.5.5.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>