diff options
| author | Tejun Heo <tj@kernel.org> | 2015-05-22 17:13:52 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-06-02 08:33:36 -0600 |
| commit | a06fd6b102286e3b727ed42b8fb37825fa7127a2 (patch) | |
| tree | 8de297e2023740b847e9ec57d8ceb28d550535d2 /mm | |
| parent | c00ddad39f512b1a81e25b7892217ce10efab0f1 (diff) | |
writeback: make laptop_mode_timer_fn() handle multiple bdi_writeback's
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>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page-writeback.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 6301af28da21..682e3a6a8b2e 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1723,14 +1723,20 @@ 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); } /* |