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>
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87c6a9b253
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@ -485,6 +485,7 @@ static void balance_dirty_pages(struct address_space *mapping)
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unsigned long bdi_thresh;
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unsigned long pages_written = 0;
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unsigned long write_chunk = sync_writeback_pages();
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unsigned long pause = 1;
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struct backing_dev_info *bdi = mapping->backing_dev_info;
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@ -561,7 +562,15 @@ static void balance_dirty_pages(struct address_space *mapping)
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if (pages_written >= write_chunk)
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break; /* We've done our duty */
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schedule_timeout_interruptible(1);
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schedule_timeout_interruptible(pause);
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/*
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* Increase the delay for each loop, up to our previous
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* default of taking a 100ms nap.
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*/
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pause <<= 1;
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if (pause > HZ / 10)
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pause = HZ / 10;
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}
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if (bdi_nr_reclaimable + bdi_nr_writeback < bdi_thresh &&
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