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Date: Tue, 10 Nov 2009 16:22:19 -0800 From: Randy Dunlap <randy.dunlap@...cle.com> To: lkml <linux-kernel@...r.kernel.org>, Jens Axboe <jens.axboe@...cle.com> Subject: [PATCH] block core: use round_jiffies on timer to reduce wakeups From: Randy Dunlap <randy.dunlap@...cle.com> Use round_jiffies() variant to schedule the timer along with other timer wakeups on the same CPU. Source file also needs to include jiffies.h since it uses functions or macros from it. Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com> --- block/blk-core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- lnx-2632-rc6.orig/block/blk-core.c +++ lnx-2632-rc6/block/blk-core.c @@ -17,6 +17,7 @@ #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/highmem.h> +#include <linux/jiffies.h> #include <linux/mm.h> #include <linux/kernel_stat.h> #include <linux/string.h> @@ -212,7 +213,8 @@ void blk_plug_device(struct request_queu return; if (!queue_flag_test_and_set(QUEUE_FLAG_PLUGGED, q)) { - mod_timer(&q->unplug_timer, jiffies + q->unplug_delay); + mod_timer(&q->unplug_timer, + round_jiffies_up(jiffies + q->unplug_delay)); trace_block_plug(q); } } -- 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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