Messages in this thread Patch in this message | | | From | Tejun Heo <> | Subject | [PATCH 20/45] writeback: make laptop_mode_timer_fn() handle multiple bdi_writeback's | Date | Tue, 6 Jan 2015 16:25:57 -0500 |
| |
For cgroup writeback support, all bdi-wide operations should be distributed to all its wb's (bdi_writeback's).
This patch updates laptop_mode_timer_fn() so that it invokes wb_start_writeback() on all wb's rather than just the root one. As the intent is writing out all dirty data, there's no reason to split the number of pages to write.
Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> --- mm/page-writeback.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 18bf51d..190e2a2 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1725,14 +1725,20 @@ void laptop_mode_timer_fn(unsigned long data) struct request_queue *q = (struct request_queue *)data; int nr_pages = global_page_state(NR_FILE_DIRTY) + global_page_state(NR_UNSTABLE_NFS); + struct bdi_writeback *wb; + struct wb_iter iter; /* * We want to write everything out, not just down to the dirty * threshold */ - if (bdi_has_dirty_io(&q->backing_dev_info)) - wb_start_writeback(&q->backing_dev_info.wb, nr_pages, true, - WB_REASON_LAPTOP_TIMER); + if (!bdi_has_dirty_io(&q->backing_dev_info)) + return; + + bdi_for_each_wb(wb, &q->backing_dev_info, &iter, 0) + if (wb_has_dirty_io(wb)) + wb_start_writeback(wb, nr_pages, true, + WB_REASON_LAPTOP_TIMER); } /* -- 2.1.0
| |