How would the kernel know that a file is a tmp file?
[just a random idea; i have not worked out all the implications]
Would it be possible to derive a writeback apriority from the ionice
level of the process originating the IO? e.g. we have long standing
problems that background jobs even when niced and can cause
significant slow downs to foreground processes by starving IO
and pushing out pages. ionice was supposed to help with that
but in practice it does not seem to have helped too much and I suspect
it needs more prioritization higher up the VM food chain. Adding
such priorities to writeback would seem like a step in the right
direction, although it would of course not solve the problem
completely.
-Andi
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