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701b1f8168
It's possible for a zvol_write thread to enter direct memory reclaim while holding open a transaction group. This results in the system attempting to write out data to the disk to free memory. Unfortunately, this can't succeed because the the thread doing reclaim is holding open the txg which must be closed to be synced to disk. To prevent this the offending allocation is marked KM_PUSHPAGE which will prevent it from attempting writeback. Closes #191 |
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