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Date: Fri, 8 Oct 2010 16:35:14 +0800 From: Yong Wang <yong.y.wang@...ux.intel.com> To: Jens Axboe <jaxboe@...ionio.com>, Christoph Hellwig <hch@....de>, Artem Bityutskiy <Artem.Bityutskiy@...ia.com>, Wu Fengguang <fengguang.wu@...el.com> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, xia.wu@...el.com Subject: [PATCH] bdi: use deferable timer for sync_supers task 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@...el.com> Signed-off-by: Xia Wu <xia.wu@...el.com> --- 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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