Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932459Ab0GVN7m (ORCPT ); Thu, 22 Jul 2010 09:59:42 -0400 Received: from smtp.nokia.com ([192.100.105.134]:52120 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759435Ab0GVN4l (ORCPT ); Thu, 22 Jul 2010 09:56:41 -0400 From: Artem Bityutskiy To: Jens Axboe Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCHv3 11/14] writeback: prevent unnecessary bdi threads wakeups Date: Thu, 22 Jul 2010 16:56:25 +0300 Message-Id: <1279806988-14100-12-git-send-email-dedekind1@gmail.com> X-Mailer: git-send-email 1.7.1.1 In-Reply-To: <1279806988-14100-1-git-send-email-dedekind1@gmail.com> References: <1279806988-14100-1-git-send-email-dedekind1@gmail.com> X-OriginalArrivalTime: 22 Jul 2010 13:56:37.0300 (UTC) FILETIME=[B3CB9F40:01CB29A5] X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5466 Lines: 173 From: Artem Bityutskiy Finally, we can get rid of unnecessary wake-ups in bdi threads, which are very bad for battery-driven devices. There are two types of activities bdi threads do: 1. process bdi works from the 'bdi->work_list' 2. periodic write-back So there are 2 sources of wake-up events for bdi threads: 1. 'bdi_queue_work()' - submits bdi works 2. '__mark_inode_dirty()' - adds dirty I/O to bdi's The former already has bdi wake-up code. The latter does not, and this patch adds it. '__mark_inode_dirty()' is hot-path function, but this patch adds another 'spin_lock(&bdi->wb_lock)' there. However, it is taken only in rare cases when the bdi has no dirty inodes. So adding this spinlock should be fine and should not affect performance. This patch makes sure bdi threads and the forker thread do not wake-up if there is nothing to do. The forker thread will nevertheless wake up at least every 5 min. to check whether it has to kill a bdi thread. This can also be optimized, but is not worth it. This patch also tidies up the warning about unregistered bid, and turns it from an ugly crocodile to a simple 'WARN()' statement. Signed-off-by: Artem Bityutskiy Reviewed-by: Christoph Hellwig --- fs/fs-writeback.c | 60 +++++++++++++++++++++++++++++++++++++++++++--------- mm/backing-dev.c | 16 ++++++++++--- 2 files changed, 61 insertions(+), 15 deletions(-) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index b834715..6477782 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -830,10 +830,16 @@ int bdi_writeback_thread(void *data) continue; } - if (dirty_writeback_interval) + if (wb_has_dirty_io(wb) && dirty_writeback_interval) schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10)); - else + else { + /* + * We have nothing to do, so can go sleep without any + * timeout and save power. When a work is queued or + * something is made dirty - we will be woken up. + */ schedule(); + } try_to_freeze(); } @@ -869,6 +875,26 @@ void wakeup_flusher_threads(long nr_pages) rcu_read_unlock(); } +/* + * This function is used when the first inode for this bdi is marked dirty. It + * wakes-up the corresponding bdi thread which should then take care of the + * periodic background write-out of dirty inodes. + */ +static void wakeup_bdi_thread(struct backing_dev_info *bdi) +{ + spin_lock(&bdi->wb_lock); + if (bdi->wb.task) + wake_up_process(bdi->wb.task); + else + /* + * When bdi tasks are inactive for long time, they are killed. + * In this case we have to wake-up the forker thread which + * should create and run the bdi thread. + */ + wake_up_process(default_backing_dev_info.wb.task); + spin_unlock(&bdi->wb_lock); +} + static noinline void block_dump___mark_inode_dirty(struct inode *inode) { if (inode->i_ino || strcmp(inode->i_sb->s_id, "bdev")) { @@ -921,6 +947,8 @@ static noinline void block_dump___mark_inode_dirty(struct inode *inode) void __mark_inode_dirty(struct inode *inode, int flags) { struct super_block *sb = inode->i_sb; + struct backing_dev_info *bdi = NULL; + bool wakeup_bdi = false; /* * Don't do this for I_DIRTY_PAGES - that doesn't actually @@ -974,22 +1002,32 @@ void __mark_inode_dirty(struct inode *inode, int flags) * reposition it (that would break b_dirty time-ordering). */ if (!was_dirty) { - struct bdi_writeback *wb = &inode_to_bdi(inode)->wb; - struct backing_dev_info *bdi = wb->bdi; - - if (bdi_cap_writeback_dirty(bdi) && - !test_bit(BDI_registered, &bdi->state)) { - WARN_ON(1); - printk(KERN_ERR "bdi-%s not registered\n", - bdi->name); + bdi = inode_to_bdi(inode); + + if (bdi_cap_writeback_dirty(bdi)) { + WARN(!test_bit(BDI_registered, &bdi->state), + "bdi-%s not registered\n", bdi->name); + + /* + * If this is the first dirty inode for this + * bdi, we have to wake-up the corresponding + * bdi thread to make sure background + * write-back happens later. + */ + if (!wb_has_dirty_io(&bdi->wb)) + wakeup_bdi = true; } inode->dirtied_when = jiffies; - list_move(&inode->i_list, &wb->b_dirty); + list_move(&inode->i_list, &bdi->wb.b_dirty); } } out: spin_unlock(&inode_lock); + + if (wakeup_bdi) + wakeup_bdi_thread(bdi); + } EXPORT_SYMBOL(__mark_inode_dirty); diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 8609701..ef880d9 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -411,10 +411,18 @@ static int bdi_forker_thread(void *ptr) unsigned long wait; wait = msecs_to_jiffies(dirty_writeback_interval * 10); - if (wait) - schedule_timeout(wait); - else - schedule(); + if (!wb_has_dirty_io(me) || !wait) { + /* + * There are no dirty data. The only thing we + * should now care is checking for inactive bdi + * threads and killing them. Thus, let's sleep + * for longer time to avoid unnecessary + * wake-ups, save energy and be friendly for + * battery-driven devices. + */ + wait = bdi_longest_inactive(); + } + schedule_timeout(wait); try_to_freeze(); continue; } -- 1.7.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/