For postgres that'd allow us to submit IO without locking, but still allow to complete IOs issued in other backend's rings, if they're busy with other stuff.
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Agree, it would be pretty nifty! Would not be hard to do, I think the hardest part would actually be the liburing side of it.
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If it'd require more manual work to set up, it'd be fair enough. Though it turns out that the contention I was just seeing was unnecessary. Still bothersome to have to be careful to hold submission side lock until all submissions have to be consumed by kernel (due to mm/fds).
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