tree ecb36de5f34865613c9eec3db3c0de034aaf7e33
parent 8e1de26cd5db192b52819f5ee97bab308964f3ab
author Jens Axboe <axboe@fb.com> 1472746833 -0600
committer Jens Axboe <axboe@fb.com> 1478618935 -0700

writeback: track if we're sleeping on progress in balance_dirty_pages()

Note in the bdi_writeback structure whenever a task ends up sleeping
waiting for progress. We can use that information in the lower layers
to increase the priority of writes.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>