Commit 87c6a9b253520b66e7f5e8f67a37a701eaa51cee
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3542a5c0de
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writeback: make balance_dirty_pages() gradually back more off
Currently it just sleeps for a very short time, just 1 jiffy. If we keep looping in there, continually delay for a little longer of up to 100msec in total. That was the old limit for congestion wait. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Showing 1 changed file with 10 additions and 1 deletions Side-by-side Diff
mm/page-writeback.c
| ... | ... | @@ -485,6 +485,7 @@ |
| 485 | 485 | unsigned long bdi_thresh; |
| 486 | 486 | unsigned long pages_written = 0; |
| 487 | 487 | unsigned long write_chunk = sync_writeback_pages(); |
| 488 | + unsigned long pause = 1; | |
| 488 | 489 | |
| 489 | 490 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
| 490 | 491 | |
| ... | ... | @@ -561,7 +562,15 @@ |
| 561 | 562 | if (pages_written >= write_chunk) |
| 562 | 563 | break; /* We've done our duty */ |
| 563 | 564 | |
| 564 | - schedule_timeout_interruptible(1); | |
| 565 | + schedule_timeout_interruptible(pause); | |
| 566 | + | |
| 567 | + /* | |
| 568 | + * Increase the delay for each loop, up to our previous | |
| 569 | + * default of taking a 100ms nap. | |
| 570 | + */ | |
| 571 | + pause <<= 1; | |
| 572 | + if (pause > HZ / 10) | |
| 573 | + pause = HZ / 10; | |
| 565 | 574 | } |
| 566 | 575 | |
| 567 | 576 | if (bdi_nr_reclaimable + bdi_nr_writeback < bdi_thresh && |