On Tue, Nov 24, 2015 at 02:05:12PM -0800, Shaohua Li wrote:
> The lib/iommu-common.c uses a bitmap and a lock. This implementation
> actually uses a percpu_ida which completely avoids locking. It would be
> possible to make lib/iommu-common.c use percpu_ida too if somebody wants
> to do it, but I think this shouldn't be a blocker for these patches
> giving it has huge performance gain.
It doesn't "completely avoids locking", the percpu_ida code uses a lock
internally too. Also, what is the memory and device address space
overhead per cpu?
Joerg
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