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Date: Wed, 20 Sep 2017 16:35:05 +0200 From: Jan Kara <jack@...e.cz> To: Jens Axboe <axboe@...nel.dk> Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, hannes@...xchg.org, clm@...com, jack@...e.cz Subject: Re: [PATCH 3/6] page-writeback: pass in '0' for nr_pages writeback in laptop mode On Tue 19-09-17 13:53:04, Jens Axboe wrote: > Laptop mode really wants to writeback the number of dirty > pages and inodes. Instead of calculating this in the caller, > just pass in 0 and let wakeup_flusher_threads() handle it. > > Use the new wakeup_flusher_threads_bdi() instead of rolling > our own. > > Signed-off-by: Jens Axboe <axboe@...nel.dk> ... > - rcu_read_lock(); > - list_for_each_entry_rcu(wb, &q->backing_dev_info->wb_list, bdi_node) > - if (wb_has_dirty_io(wb)) > - wb_start_writeback(wb, nr_pages, true, > - WB_REASON_LAPTOP_TIMER); > - rcu_read_unlock(); > + wakeup_flusher_threads_bdi(q->backing_dev_info, 0, > + WB_REASON_LAPTOP_TIMER); > } So this slightly changes the semantics since previously we were doing range_cyclic writeback and now we don't. I don't think this matters in practice but please mention that in the changelog. With that you can add: Reviewed-by: Jan Kara <jack@...e.cz> Honza -- Jan Kara <jack@...e.com> SUSE Labs, CR
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