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Btrfs: unplug every once and a while

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The btrfs io submission threads can build up massive plug lists.  This
keeps things more reasonable so we don't hand over huge dumps of IO at
once.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2011-12-15 15:38:41 -05:00
parent 567a45e917
commit d85c8a6f1b
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/volumes.c
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@ -295,6 +295,12 @@ static noinline int run_scheduled_bios(struct btrfs_device *device)
btrfs_requeue_work(&device->work);
goto done;
}
/* unplug every 64 requests just for good measure */
if (batch_run % 64 == 0) {
blk_finish_plug(&plug);
blk_start_plug(&plug);
sync_pending = 0;
}
}
cond_resched();