diff options
| -rw-r--r-- | mm/page-writeback.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 155efca4c12..17403e3a7c8 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1148,6 +1148,19 @@ pause: if (task_ratelimit) break; + /* + * In the case of an unresponding NFS server and the NFS dirty + * pages exceeds dirty_thresh, give the other good bdi's a pipe + * to go through, so that tasks on them still remain responsive. + * + * In theory 1 page is enough to keep the comsumer-producer + * pipe going: the flusher cleans 1 page => the task dirties 1 + * more page. However bdi_dirty has accounting errors. So use + * the larger and more IO friendly bdi_stat_error. + */ + if (bdi_dirty <= bdi_stat_error(bdi)) + break; + if (fatal_signal_pending(current)) break; } |