On Thu, Mar 16, 2023 at 03:25:52PM +0000, David Howells wrote: > If a network protocol sendmsg() sees MSG_SPLICE_DATA, it expects that the > iterator is of ITER_BVEC type and that all the pages can have refs taken on > them with get_page() and discarded with put_page(). Bits of network > filesystem protocol data, however, are typically contained in slab memory > for which the cleanup method is kfree(), not put_page(), so this doesn't > work. > > Provide a simple allocator, zcopy_alloc(), that allocates a page at a time > per-cpu and sequentially breaks off pieces and hands them out with a ref as > it's asked for them. The caller disposes of the memory it was given by > calling put_page(). When a page is all parcelled out, it is abandoned by > the allocator and another page is obtained. The page will get cleaned up > when the last skbuff fragment is destroyed. This feels a _lot_ like the page_frag allocator. Can the two be unified?
