>>>>> "Christoph" == Christoph Hellwig <hch@xxxxxx> writes: Christoph> Seems like these counters are missing any sort of Christoph> synchronization for updates, as a over 10 year old comment Christoph> from me noted. Fix this by using atomic counters, and while Christoph> we're at it also make sure they are in the same cacheline as Christoph> the _busy counters and not needlessly stored to in every I/O Christoph> completion. Christoph> With the new model the _busy counters can temporarily go Christoph> negative, so all the readers are updated to check for > 0 Christoph> values. Longer term every successful I/O completion will Christoph> reset the counters to zero, so the temporarily negative Christoph> values will not cause any harm. Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx> -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
