Messages in this thread | | | Subject | Re: [RFC][PATCH] Per file dirty limit throttling | From | Peter Zijlstra <> | Date | Tue, 17 Aug 2010 10:24:35 +0200 |
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On Tue, 2010-08-17 at 10:39 +0530, Nikanth Karthikesan wrote: > Oh, nice. Per-task limit is an elegant solution, which should help during > most of the common cases. > > But I just wonder what happens, when > 1. The dirtier is multiple co-operating processes > 2. Some app like a shell script, that repeatedly calls dd with seek and skip? > People do this for data deduplication, sparse skipping etc.. > 3. The app dies and comes back again. Like a VM that is rebooted, and > continues writing to a disk backed by a file on the host. > > Do you think, in those cases this might still be useful?
Those cases do indeed defeat the current per-task-limit, however I think the solution to that is to limit the amount of writeback done by each blocked process.
Jan Kara had some good ideas in that department.
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