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As an ongoing series from previous xfs_repair patches, this one changes
the method of selecting and performing multithreaded AG processing. With most simple filesystems, the current multithreading method actually make xfs_repair slower by increasing the amount of disk seeking between AGs. The biggest benefits for parallel processing of AGs is when the filesystem is across a concat of disks/LUNs. So, now the default is a single thread unless you specify an "ag_stride" using the xfs_repair -o option. Then it will initiate a suitable number of threads based on the number of AGs in the filesystem and the stride value. For example, a 32 AG filesystem with a concat of 2 equal sized disks/LUNs, you would use the "-o ag_stride=16" to get one thread to process AGs 0-15 and the second thread to process AGs 16-31. Generally, the stride value is set to the AG number that is fully within the second part of the concat.
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