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SubjectRe: [RFC][PATCH] Per file dirty limit throttling
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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