Currently, we use array_cache for alien_cache. Although they are mostly
similar, there is one difference, that is, need for spinlock.
We don't need spinlock for array_cache itself, but to use array_cache for
alien_cache, array_cache structure should have spinlock. This is needless
overhead, so
Currently, we use array_cache for alien_cache. Although they are mostly
similar, there is one difference, that is, need for spinlock.
We don't need spinlock for array_cache itself, but to use array_cache for
alien_cache, array_cache structure should have spinlock. This is needless
overhead, so
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