On Wed, Sep 02, 2020 at 08:26:42PM +0800, Ming Lei wrote: > 'struct percpu_ref' is often embedded into one user structure, and the > instance is usually referenced in fast path, however actually only > 'percpu_count_ptr' is needed in fast path. > > So move other fields into one new structure of 'percpu_ref_data', and > allocate it dynamically via kzalloc(), then memory footprint of > 'percpu_ref' in fast path is reduced a lot and becomes suitable to put > into hot cacheline of user structure. This looks good: Reviewed-by: Christoph Hellwig <hch@xxxxxx>
