On Wed 30-03-16 09:07:52, Jens Axboe wrote: > Note in the bdi_writeback structure if a task is currently being > limited in balance_dirty_pages(), waiting for writeback to > proceed. ... > diff --git a/mm/page-writeback.c b/mm/page-writeback.c > index 11ff8f758631..15e696bc5d14 100644 > --- a/mm/page-writeback.c > +++ b/mm/page-writeback.c > @@ -1746,7 +1746,9 @@ pause: > pause, > start_time); > __set_current_state(TASK_KILLABLE); > + wb->dirty_sleeping = 1; > io_schedule_timeout(pause); > + wb->dirty_sleeping = 0; Huh, but wb->dirty_sleeping is shared by all the processes in the system. So this is seriously racy, isn't it? You rather need a counter for this to work. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
